Prof. Cunlin Zhang Profile

Prof. Cunlin Zhang

at Capital Normal Univ

SPIE Involvement:

Conference Chair | Editor | Author

Publications (137)

SPIE Conference Volume | January 24, 2018

2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

PROCEEDINGS ARTICLE | January 12, 2018

Studies on the resonant properties in the asymmetric dipole-array terahertz metamaterials

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Metamaterials, Resonators, Optoelectronics, Terahertz metamaterials

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PROCEEDINGS ARTICLE | January 12, 2018

Detection of Ionic liquid using terahertz time-domain spectroscopy

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Refractive index, Water, Spectroscopy, Dielectrics, Ions, Hydrogen, Terahertz radiation, Terahertz spectroscopy, Dielectric relaxation, Liquids

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Terahertz (THz, THz+10¹²Hz) spectroscopy is a far-infrared analytical technology with spectral bands locating between microware and infrared ranges. Being of excellent transmission, non-destruction and high discrimination, this technology has been applied in various fields such as physics, chemistry, nondestructive detection, communication, biomedicine public security. Terahertz spectrum is corresponding with vibration and rotation of liquid molecules, which is suitable to identify and study the liquid molecular dynamics. It is as a powerful spectral detection technology, terahertz time-domain spectroscopy is widely used in solution detection. can enable us to extract the material parameters or dielectric spectrum that show material micro-structure and dynamics by measuring amplitude and phase from coherent terahertz pulses. Ionic liquid exists in most biological tissues, and it is very important for life. It has recently been suggested that near-fired terahertz ionic contrast microscopy can be employed to image subtle changes in ionic concentrations arising from neuronal activity. In this paper, we detected Ionic liquid with different concentrations at room temperature by THz-TDS technique in the range of 0.2-1.5 THz. The liquid cell with a thickness of 0.2mm is made of quartz. The absorption coefficient, refractive index and dielectric function of solutions can be extracted based on THz-TDS. We use an expanded model for fitting the dielectric function based on a combination of a Debye relation for the anions and cations. We find A linear increase of the real and imaginary part of the dielectric function compared with pure water with increasing ion concentrations. A good agreement between the model and the experimental results is obtained. By means of dielectric relaxation process, it was found that the characteristic time of molecular movement and the information related to the liquid molecular structure and movement was obtained.

PROCEEDINGS ARTICLE | January 12, 2018

Study on THz wave generation from air plasma induced by quasi-square Airy beam

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Mirrors, Gaussian beams, Modulation, Crystals, Phase shift keying, Spatial light modulators, Terahertz radiation, Laser crystals, Plasma generation, Plasma

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PROCEEDINGS ARTICLE | January 12, 2018

Quantitative detection of melamine based on terahertz time-domain spectroscopy

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Refractive index, Spectroscopy, Nondestructive evaluation, Terahertz spectroscopy, Terahertz technology, Absorption

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PROCEEDINGS ARTICLE | January 12, 2018

Removing the echoes from terahertz pulse reflection system and sample

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Sensors, Silicon, Gaussian filters, Deconvolution, Terahertz radiation, Semiconducting wafers, Pulsed laser operation

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PROCEEDINGS ARTICLE | January 12, 2018

Hydrothermal preparation of vanadium dioxide thin films and research progress of terahertz modulation

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Vanadium, Thin films, Modulation, Metals, Crystals, Resistance, Transition metals, Phase shift keying, Terahertz radiation, Terahertz spectroscopy

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PROCEEDINGS ARTICLE | January 12, 2018

Studies on electromagnetic response in arc-shaped structures in terahertz region

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Metamaterials, Superposition, Finite-difference time-domain method, Modulation, Resonators, Imaging spectroscopy, Optoelectronics, Terahertz radiation, Terahertz metamaterials, Electromagnetism

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PROCEEDINGS ARTICLE | January 12, 2018

Manipulating the strength and broadband of the resonators in the terahertz metamaterials

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Metamaterials, Finite-difference time-domain method, Modulation, Resonators, Polarization, Sensors, Modulators, Terahertz radiation, Terahertz metamaterials, Electromagnetism

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PROCEEDINGS ARTICLE | January 12, 2018

A simple system for 160GHz optical terahertz wave generation and data modulation

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Optical filters, Radio optics, Modulation, Signal attenuation, Modulators, Telecommunications, Terahertz radiation, Wireless communications, Microwave radiation, Terahertz technology

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PROCEEDINGS ARTICLE | January 12, 2018

The preparation method of terahertz monolithic integrated device

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Semiconductors, Waveguides, Electrodes, Metals, Gallium arsenide, Terahertz radiation, Antennas, Terahertz spectroscopy, Semiconducting wafers, Millimeter wave sensors

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PROCEEDINGS ARTICLE | January 12, 2018

Light field imaging and application analysis in THz

Proc. SPIE. 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications

KEYWORDS: Microlens array, Imaging systems, Sensors, Fourier transforms, Terahertz radiation, Imaging arrays

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PROCEEDINGS ARTICLE | January 10, 2018

An effective way to reduce water absorption to terahertz

Proc. SPIE. 10616, 2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments

KEYWORDS: Potassium, Microfluidics, Molecules, Hydrogen, Imaging spectroscopy, Terahertz radiation, Transmittance, Sodium, Liquids, Absorption

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PROCEEDINGS ARTICLE | October 24, 2017

Study of the traditional Chinese pigments by terahertz time-domain and Fourier-transform infrared spectroscopy

Proc. SPIE. 10459, AOPC 2017: Optical Storage and Display Technology

KEYWORDS: Infrared spectroscopy, Terahertz spectroscopy

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PROCEEDINGS ARTICLE | October 24, 2017

Influence of asymmetric structures on electromagnetic response characteristics of terahertz metamaterials

Proc. SPIE. 10459, AOPC 2017: Optical Storage and Display Technology

KEYWORDS: Metamaterials, Terahertz metamaterials, Electromagnetism

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PROCEEDINGS ARTICLE | October 24, 2017

Studies on the trapped-mode resonant properties in asymmetric terahertz metamaterial

Proc. SPIE. 10459, AOPC 2017: Optical Storage and Display Technology

KEYWORDS: Metamaterials, Terahertz metamaterials, Electromagnetism

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PROCEEDINGS ARTICLE | August 23, 2017

Characterization of THz wave generated from air plasma induced by two-color laser with long wavelength

Proc. SPIE. 10383, Terahertz Emitters, Receivers, and Applications VIII

KEYWORDS: Tunable lasers, Polarization, Crystals, Terahertz radiation, Laser crystals, Harmonic generation, Nonlinear crystals, Plasma generation, Pulsed laser operation, Plasma

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SPIE Conference Volume | January 25, 2017

Infrared, Millimeter-Wave, and Terahertz Technologies IV

PROCEEDINGS ARTICLE | December 8, 2016

The birefringence of two liquid crystals in terahertz band

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Refractive index, Silica, Birefringence, Spectroscopy, Refraction, Liquid crystals, Terahertz radiation, Electro optics, Terahertz spectroscopy, Anisotropy

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PROCEEDINGS ARTICLE | November 3, 2016

Terahertz characteristics of graphene deposited on different substrates

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Polymethylmethacrylate, Graphene, Signal attenuation, Silicon, Chemical vapor deposition, Sapphire, Terahertz radiation, Transmittance, Picosecond phenomena, Terahertz spectroscopy

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PROCEEDINGS ARTICLE | November 3, 2016

Design and research for biosensing THz microfluidic chips

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Signal to noise ratio, Microfluidics, Biosensing, Molecules, Terahertz radiation, Transmittance, Molecular biology, Terahertz technology, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 3, 2016

The properties of electromagnetic responses and optical modulation in terahertz metamaterials

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Metamaterials, Refractive index, Finite-difference time-domain method, Modulation, Gallium arsenide, Terahertz radiation, Split ring resonators, Terahertz metamaterials, Electromagnetism, Absorption

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PROCEEDINGS ARTICLE | November 3, 2016

Wavelength scaling of terahertz generation via two color photoionization in pre-formed plasma

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Optical amplifiers, Modulation, Electrons, Laser applications, Imaging spectroscopy, Ionization, Terahertz radiation, Plasma generation, Pulsed laser operation, Plasma

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PROCEEDINGS ARTICLE | November 3, 2016

Wavelength scaling of terahertz radiation in plasma gas targets

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Argon, Gases, Nitrogen, Xenon, Ionization, Terahertz radiation, Helium, Neon, Krypton, Plasma

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PROCEEDINGS ARTICLE | November 3, 2016

Terahertz spectroscopy of different types of water

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Refractive index, Minerals, Water, Spectroscopy, Terahertz radiation, Terahertz spectroscopy, Dielectric polarization, Liquids, Absorption, Correlation function

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PROCEEDINGS ARTICLE | November 3, 2016

Simulation study of microstrip line in on-chip THz system

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Gold, Waveguides, Signal attenuation, Quartz, Metals, Skin, Dielectrics, Silicon, Free space, Terahertz radiation

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PROCEEDINGS ARTICLE | November 3, 2016

Research of biological liquid albumin based on terahertz time domain spectroscopy

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Refractive index, Proteins, Principal component analysis, Water, Spectroscopy, Terahertz radiation, Biological research, Terahertz spectroscopy, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 3, 2016

The design of circuit for THz time domain spectroscopy system based on asynchronous optical sampling

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Optical amplifiers, Femtosecond phenomena, Sensors, Spectroscopy, Control systems, Fiber lasers, Terahertz radiation, Terahertz spectroscopy, Signal detection, Pulsed laser operation

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Terahertz time domain spectroscopy system (THz-TDS) is the most commonly means of measuring terahertz time-domain spectroscopy. The time delay between the pump and probe laser is an important technology to realize THz time domain spectrum measurement. The translation platform with two mirrors and the mechanical structure is the popular means to adjust the optical path difference between the pump and probe laser to get the time delay of femtosecond pulse. Because of the limit of the mechanical structure and the phase-locked amplifier, this technique can’t scan spectrum fast. In order to obtain high quality signal, a long time will be taken to scan spectrum. So a more rapid and convenient time delay technology is required to Instead of the machine translation platform and accomplish the Rapid spectral measurement. Asynchronous optical sampling technique is a way to get the time delay by producing a very small frequency difference between the repetition frequency of two femtosecond lasers. The scanner time will be reduced, because of there is no waste of time, due to mechanical inertia, not only by using the asynchronous optical sampling method to replace the mechanical structure without the influence of vibration. It will greatly increase the degree of integration by using the fiber femtosecond laser and highly integrated circuit to realize optical asynchronous sampling.

To solve the problem above, a terahertz time-domain spectroscopy system based on asynchronous sampling is designed in this thesis. The system is based of two femtosecond laser whose repetition frequency is 100MHz.In order to realize asynchronous sampling, the control circuit of the two lasers is the most important. This thesis focuses on the researching, designing and experiment of this circuit. Firstly, the circuit is designed overall. Then the selection of the key device and the designing of the circuit principle is done by myself. Secondly, the test of the circuit to phase locked the master and slave fiber femtosecond lasers has been done. As a result, the two lasers can phase locked on two repetition frequencies with a small frequency difference calculated by the circuit.

PROCEEDINGS ARTICLE | November 3, 2016

Terahertz microfluidic chips for detection of amino acids in aqueous solutions

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Microfluidics, Spectroscopy, Molecules, Biochemistry, Terahertz radiation, Transmittance, Molecular biology, Terahertz spectroscopy, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 3, 2016

Detection of NaCl solutions using terahertz time domain spectroscopy

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Refractive index, Water, Spectroscopy, Dielectrics, Terahertz radiation, Terahertz spectroscopy, Dielectric relaxation, Terahertz technology, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 3, 2016

Nitrocellulose membrane sample holder using for terahertz time domain spectroscopy

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Magnesium, Medicine, Spectroscopy, Molecules, Imaging spectroscopy, Terahertz radiation, Terahertz spectroscopy, Terahertz technology, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 3, 2016

Research on THz stepped-frequency ISAR imaging

Proc. SPIE. 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV

KEYWORDS: Radar, Imaging systems, Scattering, Synthetic aperture radar, Image processing, Computing systems, Image resolution, Signal processing, Terahertz radiation, Radar imaging

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SPIE Journal Paper | July 12, 2016

Continuous-terahertz-wave molecular imaging system for biomedical applications

Zhang, Rui , Zhang, Liangliang , Wu, Tong , Wang, Ruixue , Zuo, Shasha , Wu, Dong , Zhang, Cunlin , Zhang, Jue , Fang, Jing

JBO Vol. 21 Issue 07

KEYWORDS: Imaging systems, Terahertz radiation, Infrared lasers, Nanoparticles, Molecular imaging, Reflection, Biomedical optics, Water, Infrared imaging, Tissues

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PROCEEDINGS ARTICLE | August 31, 2015

The study of gas species on THz generation from laser-induced air plasma

Proc. SPIE. 9585, Terahertz Emitters, Receivers, and Applications VI

KEYWORDS: Femtosecond phenomena, Argon, Chemical species, Electrons, Gases, Nitrogen, Pollution control, Terahertz radiation, Helium, Plasma

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SPIE Conference Volume | August 13, 2015

2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

PROCEEDINGS ARTICLE | August 12, 2015

The effect of different particle sizes of polyethylene on the absorption of myrrh in mixtures

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: FT-IR spectroscopy, Medicine, Scattering, Spectroscopy, Particles, Infrared spectroscopy, Solids, Terahertz radiation, Mie scattering, Absorption

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PROCEEDINGS ARTICLE | August 12, 2015

Influence of substrate refractive index and metallic structure size on resonant properties in terahertz split ring resonators

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Metamaterials, Refractive index, Finite-difference time-domain method, Modulation, Metals, Modulators, Terahertz radiation, Split ring resonators, Terahertz metamaterials, Electromagnetism

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PROCEEDINGS ARTICLE | August 12, 2015

Phase detection for continuous terahertz wave

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Optical filters, Imaging systems, Imaging spectroscopy, Signal processing, Terahertz radiation, Electronic filtering, Electro optics, Detection theory, Signal detection, Millimeter wave sensors

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PROCEEDINGS ARTICLE | August 12, 2015

Terahertz wave generation from preformed air plasma

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Beam splitters, Optical amplifiers, Electrons, Ionization, Terahertz radiation, Plasma generation, Pulsed laser operation, Terahertz technology, Beam controllers, Plasma

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PROCEEDINGS ARTICLE | August 12, 2015

Systematic study of terahertz wave generation in laser-included plasma

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Modulation, Particles, Electrons, Ions, Laser applications, Terahertz radiation, Plasma generation, Laser beam diagnostics, Pulsed laser operation, Plasma

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PROCEEDINGS ARTICLE | August 12, 2015

Strong THz to IR thermal radiation from random metallic nanostructures by femtosecond laser excitation

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Thermography, Nanostructures, Femtosecond phenomena, Nanostructuring, Sensors, Metals, Terahertz radiation, Ruthenium, Surface finishing, Absorption

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PROCEEDINGS ARTICLE | August 12, 2015

An antenna can be used for terahertz scanning imaging instrument

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Imaging spectroscopy, Electromagnetic radiation, 3D modeling, Optoelectronics, Terahertz radiation, Optical simulations, Antennas, Microwave radiation, Spectroscopes, Terahertz technology

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PROCEEDINGS ARTICLE | August 12, 2015

Ultra-broadband terahertz spectroscopy of InP wafer using coherent heterodyne time domain spectrometer

Proc. SPIE. 9625, 2015 International Conference on Optical Instruments and Technology: Terahertz Technologies and Applications

KEYWORDS: Wafer-level optics, Refractive index, Optical properties, Spectroscopy, Indium, Heterodyning, Terahertz radiation, Terahertz spectroscopy, Semiconducting wafers, Absorption

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SPIE Journal Paper | April 9, 2015

Terahertz wave absorption via femtosecond laser-filament concatenation

Zhao, Ji , Zhang, LiangLiang , Wu, Tong , Xu, XiaoYan , Zhang, CunLin , Zhao, YueJin

OE Vol. 54 Issue 04

KEYWORDS: Terahertz radiation, Plasma, Absorption, Femtosecond phenomena, Beam controllers, Electrons, Refractive index, Gases, Argon, Imaging spectroscopy

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SPIE Journal Paper | March 10, 2015

Label-free detection and characterization of the binding of hemagglutinin protein and broadly neutralizing monoclonal antibodies using terahertz spectroscopy

Sun, Yiwen , Zhong, Junlan , Zhang, Cunlin , Zuo, Jian , Pickwell-MacPherson, Emma

JBO Vol. 20 Issue 03

KEYWORDS: Proteins, Absorption, Terahertz radiation, Dielectrics, Monoclonal antibodies, Terahertz spectroscopy, Molecules, Spectroscopy, Water, Sun

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SPIE Conference Volume | December 10, 2014

Infrared, Millimeter-Wave, and Terahertz Technologies III

PROCEEDINGS ARTICLE | November 11, 2014

Terahertz spectra of glycerol, water, and their mixture in a microfluidic chip

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Microfluidics, Quartz, Water, Spectroscopy, Molecules, Terahertz radiation, Transmittance, Terahertz spectroscopy, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 11, 2014

Target recognition in passive terahertz image of human body

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Target detection, Image processing algorithms and systems, Millimeter wave imaging, Detection and tracking algorithms, Imaging systems, Image segmentation, Image processing, Terahertz radiation, Image enhancement, Target recognition

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PROCEEDINGS ARTICLE | November 11, 2014

Studies on spectroscopy of glycerol in THz range using microfluidic chip-integrated micropump

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Microfluidics, Quartz, Glasses, Spectroscopy, Molecules, Diffusers, Terahertz radiation, Terahertz spectroscopy, Liquids, Absorption

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PROCEEDINGS ARTICLE | November 11, 2014

A single-frame terahertz image super-resolution reconstruction method based on sparse representation theory

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Safety, Super resolution, Image compression, Chemical species, Image processing, Image resolution, Terahertz radiation, Associative arrays, Reconstruction algorithms, Lawrencium

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PROCEEDINGS ARTICLE | November 11, 2014

A polarization-independent terahertz modulator based on metamaterials with symmetric structure

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Semiconductors, Gold, Metamaterials, Modulation, Polarization, Modulators, Liquid crystals, Terahertz radiation, Transmittance, Absorption

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PROCEEDINGS ARTICLE | November 11, 2014

Effect on influenza hemagglutinin protein binding with neutralizing antibody using terahertz spectroscopy technology

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Proteins, Spectroscopy, Dielectrics, Monoclonal antibodies, Terahertz radiation, Molecular interactions, Viruses, Terahertz spectroscopy, Terahertz technology, Absorption

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PROCEEDINGS ARTICLE | November 11, 2014

Applications of Bruggeman effective medium theory in mixture using terahertz spectrum

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Refractive index, Spectroscopy, Particles, Molecules, Dielectrics, Tablets, Terahertz radiation, Molecular spectroscopy, Terahertz spectroscopy, Absorption

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PROCEEDINGS ARTICLE | November 11, 2014

Personnel screening with terahertz opto-mechanical scanning imaging

Proc. SPIE. 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III

KEYWORDS: Mirrors, Imaging systems, Sensors, Metals, Scanners, Ceramics, Image resolution, Terahertz radiation, Antennas, Information security

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PROCEEDINGS ARTICLE | December 31, 2013

Terahertz frequency spectrum characterization of coherent heterodyne time-domain spectrometer

Proc. SPIE. 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments

KEYWORDS: Spectroscopy, Crystals, Imaging spectroscopy, Optoelectronics, Heterodyning, Nonlinear optics, Terahertz radiation, Laser beam diagnostics, Pulsed laser operation, Plasma

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PROCEEDINGS ARTICLE | December 31, 2013

Transmitted spectral modulation of double-ring resonator using liquid crystals in terahertz range

Proc. SPIE. 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments

KEYWORDS: Metamaterials, Optical components, Refractive index, Modulation, Resonators, Quartz, Spectroscopy, Liquid crystals, Terahertz radiation, Electromagnetism

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SPIE Conference Volume | August 28, 2013

International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications

PROCEEDINGS ARTICLE | August 23, 2013

Switchable terahertz metamaterials with dual resonance

Proc. SPIE. 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications

KEYWORDS: Metamaterials, Finite-difference time-domain method, Switching, Sensors, Imaging spectroscopy, Terahertz radiation, Terahertz metamaterials, Terahertz spectroscopy, Terahertz technology, Absorption

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PROCEEDINGS ARTICLE | August 23, 2013

Characterization of terahertz emission from laser-induced air plasma under different pump power

Proc. SPIE. 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications

KEYWORDS: Mirrors, Modulation, Crystals, Silicon, Imaging spectroscopy, Linear filtering, Terahertz radiation, Laser crystals, Four wave mixing, Plasma

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PROCEEDINGS ARTICLE | August 23, 2013

Passive terahertz imaging for security application

Proc. SPIE. 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications

KEYWORDS: Defense and security, Mirrors, Millimeter wave imaging, Cell phones, Imaging systems, Sensors, Scanners, Image resolution, Image quality, Terahertz radiation

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PROCEEDINGS ARTICLE | August 23, 2013

The application of reduced absorption cross section on the identification of the compounds with similar function-groups

Proc. SPIE. 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications

KEYWORDS: Refractive index, Mirrors, Visualization, Scattering, Chemical compounds, Molecules, Terahertz radiation, Terahertz spectroscopy, Laser beam diagnostics, Absorption

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PROCEEDINGS ARTICLE | August 23, 2013

Research of room-temperature continuous-wave terahertz imaging array based on microbolometer

Proc. SPIE. 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications

KEYWORDS: Bolometers, Microbolometers, Oxides, Vanadium, Metals, Silicon, Resistance, Terahertz radiation, Imaging arrays, Absorption

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SPIE Journal Paper | January 31, 2013

Developing signal processing method for recognizing defects in metal samples based on heat diffusion properties in sonic infrared image sequences

Zeng, Zhi , Tao, Ning , Feng, Lichun , Zhang, Cunlin , Han, Xiaoyan

OE Vol. 52 Issue 06

KEYWORDS: Infrared imaging, Infrared radiation, Metals, Diffusion, Signal processing, Signal detection, Interference (communication), Image processing, Optical engineering, Defect detection

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SPIE Conference Volume | January 9, 2013

Infrared, Millimeter-Wave, and Terahertz Technologies II

PROCEEDINGS ARTICLE | December 11, 2012

One dimension high range resolution profile of terahertz radar

Proc. SPIE. 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II

KEYWORDS: Radar, Digital signal processing, Image resolution, Imaging spectroscopy, Chromium, Control systems, Signal processing, Terahertz radiation, Microwave radiation, Radar signal processing

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PROCEEDINGS ARTICLE | December 11, 2012

An improved algorithm based on ROMP used in TH imaging

Proc. SPIE. 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II

KEYWORDS: Lithium, Detection and tracking algorithms, Imaging spectroscopy, Image quality, Signal processing, Reconstruction algorithms, Detection theory, Evolutionary algorithms, Compressed sensing, Algorithms

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PROCEEDINGS ARTICLE | December 5, 2012

Computer processing of image captured by the passive THz imaging device as an effective tool for its de-noising

Proc. SPIE. 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II

KEYWORDS: Cameras, Image processing, Ceramics, Fourier transforms, Imaging devices, Image quality, Terahertz radiation, Explosives, Computer security, Correlation function

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PROCEEDINGS ARTICLE | December 5, 2012

An experimental 0.2 THz stepped frequency radar system for the target detection

Proc. SPIE. 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II

KEYWORDS: Target detection, Radar, Extremely high frequency, Imaging systems, Image resolution, Imaging spectroscopy, Terahertz radiation, Antennas, Microwave radiation, Radar imaging

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PROCEEDINGS ARTICLE | December 5, 2012

Optimization for the heating pulse used in infrared thermography non-destructive testing technology

Proc. SPIE. 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II

KEYWORDS: Infrared detectors, Thermography, Infrared sensors, Infrared imaging, Lamps, Fourier transforms, Nondestructive evaluation, Xenon, Thermal effects, Infrared radiation

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PROCEEDINGS ARTICLE | November 26, 2012

Design and optimization of chopper based on Labview

Proc. SPIE. 8557, Optical Design and Testing V

KEYWORDS: LabVIEW, Clocks, Modulation, Physics, Receivers, Adaptive optics, Data acquisition, Frequency modulation, Signal detection, Feedback signals

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PROCEEDINGS ARTICLE | October 15, 2012

Research of processing method for infrared image of sandwich structure composite

Proc. SPIE. 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment

KEYWORDS: Infrared detectors, Infrared cameras, Thermography, Infrared imaging, Aerospace engineering, Image processing, Composites, Infrared radiation, Aluminum, Image enhancement

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PROCEEDINGS ARTICLE | October 13, 2011

Possible way for increasing the quality of imaging from THz passive device

Proc. SPIE. 8189, Optics and Photonics for Counterterrorism and Crime Fighting VII; Optical Materials in Defence Systems Technology VIII; and Quantum-Physics-based Information Security

KEYWORDS: Imaging systems, Spatial filters, Opacity, Sensors, Image quality, Image filtering, Terahertz radiation, Explosives, Firearms, Liquids

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PROCEEDINGS ARTICLE | September 8, 2011

Bonding quality evaluation of wind turbine blades by pulsed thermography

Proc. SPIE. 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications

KEYWORDS: Infrared cameras, Thermography, Infrared imaging, Image processing, Inspection, Nondestructive evaluation, Imaging spectroscopy, Ultrasonics, Wind turbine technology, Infrared radiation

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PROCEEDINGS ARTICLE | September 8, 2011

The application of pulsed thermography in the inspection of wind turbine blades

Proc. SPIE. 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications

KEYWORDS: Infrared cameras, Thermography, Safety, Glasses, Manufacturing, Inspection, Nondestructive evaluation, Wind turbine technology, Wind energy, Adhesives

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Wind power is a very promising source of environmentally safe, renewable, and the fast-growing energy source over the past several years. The blades of a wind turbine are considered to be an important component in wind turbine generator. Currently, bigger and more powerful wind blades are being built to increase the swept area of the turbine and extract more energy from the wind. Correspondingly, more capital cost is invested in manufacture and service. In order to reduce damage possibility and extend the wind turbine blades life, there are increasing demands for the inspection of wind turbine blades in the manufacturing factory and on site inspection. The regular inspections of wind turbine blades are done normally by using visual inspection and tapping test. To improve the safety of wind turbine blades, nondestructive testing technique using pulsed thermography is being investigated in this study. This technique utilized an active pulsed heating source that is applied on the outer surface of wind turbine blades, and an infrared camera to monitor the surface temperature distribution controlled by a computer. Reflective pulsed thermography was directly applied on several full scale wind blades, surface and subsurface defects, such as air bubbles, pin holes, edge bonding, etc. were clearly detected. Several specimens were intentionally manufactured to simulate the glue faults between supporting spars and glass fiber reinforced plastic (GFRP) shells with different thickness. Afterwards they were inspected by using pulsed thermography in laboratory. The current test results indicated that pulsed thermography has the potential for the detection of glue faults at least about 15mm thickness GFRP shell. It is shown that pulsed thermography maybe provide a powerful non-contacting technique for the inspection of wind turbine blades as well in the workshop just after the production or in the field that before and after installation of the wind blades and during reparation.

PROCEEDINGS ARTICLE | September 8, 2011

The effect of depth on the quantitative estimation of defect size using pulsed thermography

Proc. SPIE. 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications

KEYWORDS: Thermography, Metals, Nondestructive evaluation, 3D modeling, 3D metrology, Finite element methods, Infrared radiation, Aluminum, Heat flux, Thermal modeling

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PROCEEDINGS ARTICLE | September 8, 2011

Pulsed thermography detection of water and hydraulic oil intrusion in the honeycomb sandwich structure composite

Proc. SPIE. 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications

KEYWORDS: Infrared cameras, Thermography, Roads, Imaging systems, Skin, Composites, Lamps, Nondestructive evaluation, Oxygen, Liquids

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SPIE Conference Volume | August 11, 2011

International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications

PROCEEDINGS ARTICLE | June 3, 2011

2D signature for detection and identification of drugs

Proc. SPIE. 8040, Active and Passive Signatures II

KEYWORDS: Visible radiation, Transparency, Fourier transforms, Terahertz radiation, Chemical analysis, Explosives, Picosecond phenomena, Biological research, Signal detection, Absorption

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PROCEEDINGS ARTICLE | November 17, 2010

Terahertz photon production from cold atoms inside an optical cavity