Prof. Cunlin Zhang Profile

Prof. Cunlin Zhang

at Capital Normal Univ

SPIE Involvement:

Conference Chair | Author | Editor

Publications (121)

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

The properties of electromagnetic responses and optical modulation in terahertz metamaterials

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

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

PROCEEDINGS ARTICLE | November 3, 2016

Terahertz characteristics of graphene deposited on different substrates

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

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

Read Abstract

PROCEEDINGS ARTICLE | November 3, 2016

Design and research for biosensing THz microfluidic chips

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

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

Read Abstract

PROCEEDINGS ARTICLE | November 3, 2016

Terahertz spectroscopy of different types of water

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

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

Read Abstract

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

Read Abstract

PROCEEDINGS ARTICLE | November 3, 2016

Research on THz stepped-frequency ISAR imaging

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

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

Read Abstract

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

Read Abstract

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

Read Abstract

SPIE Conference Volume | August 13, 2015

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

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

SPIE Conference Volume | December 10, 2014

Infrared, Millimeter-Wave, and Terahertz Technologies III

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

Read Abstract

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, Terahertz radiation, Absorption, Quartz, Transmittance, Liquids, Water, Terahertz spectroscopy, Spectroscopy, Molecules

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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, Terahertz radiation, Glasses, Terahertz spectroscopy, Spectroscopy, Absorption, Quartz, Liquids, Molecules, Diffusers

Read Abstract

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

Read Abstract

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

Read Abstract

SPIE Conference Volume | August 28, 2013

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

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

DOWNLOAD PDF

SPIE Conference Volume | January 9, 2013

Infrared, Millimeter-Wave, and Terahertz Technologies II

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

PROCEEDINGS ARTICLE | November 26, 2012

Design and optimization of chopper based on Labview

Proc. SPIE. 8557, Optical Design and Testing V

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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

Read Abstract

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.

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

Read Abstract

PROCEEDINGS ARTICLE | November 17, 2010

Terahertz photon production from cold atoms inside an optical cavity