An acousto-optic tunable filter (AOTF) is an acousto-optic modulator. In this paper, the characteristics and overall
design method of AOTF hyperspectral imaging system are proposed, which operates in visible or near infrared waveband
(0.4-1.0um) and middle wave or long wave (3-5um and 8-12um). Compared with conventional dispersion element, the
AOTF hyperspectral imaging system has a larger clear aperture because of the special characteristic of beam separation
mode. In particularly, if the non-collinear design mode is used, the AOTF will have a larger diffraction aperture angle
and is more suitable for the application in spectral imaging domain. The AOTF hyperspectral imaging spectrometer that
operates in visible/near infrared waveband was developed by the non-collinear TeO2 crystal (8mm×8mm). All lights that
are through TeO2 crystal in whole field of view (FOV angle is 5 degree) forms an imagines onto the staring focal plane
array by Bragg diffraction. The diffraction wavelength of AOTF can be adjusted by the radio frequency signal. The
three-dimensional data cube is composed of two-dimension of object space and wavelength in this way, and the graph
and spectral are synthesized and implemented. The AOTF hyperspectral imaging spectrometer operating in visible/near
infrared waveband is analyzed, and the detailed analysis data is also presented. The AOTF hyperspectral imaging test is
studied and developed, and the analysis of data and the next developing advice is given. We also analyze the method
about selection of material and technological design in middle wave/long wave infrared waveband of AOTF
hyperspectral imaging system.
We have to make the integral sphere source trace to the standard lamp, when we calibrate the
imaging spectrometer. But the standard lamp need to be calibrated by the blackbody firstly. In this
paper, we have the integral sphere source trace to the blackbody directly, using the exclusive
spectral response of a spectrometer. During the experiments, two spectral responses of the
spectrometer (200nm~1100nm) within 700nm~900nm are obtained separately by measuring the
spectral radiances of the blackbody at 1000°C and the integral sphere source at some color
temperature. We get the equivalent color temperature of the integral sphere source, making use of
the consistency of the two spectral responses in theory. After that, we can compute the spectral
radiance at the exit of integral sphere by Plank formula. So we not only complete the calibration of
the integral sphere source, but also have the integral sphere source trace to the blackbody
simultaneously. From the result analysis,we think this method is exact enough for the calibration
about the spectral radiation of the integral sphere source.
Multispectral imaging detecting technology use target radiation character in spectral spatial distribution and relation
between spectral and image to detect target and remote sensing measure. Its speciality is multi channel, narrow
bandwidth, large amount of information, high accuracy. The ability of detecting target in environment of clutter,
camouflage, concealment and beguilement is improved. At present, spectral imaging technology in the range of
multispectral and hyperspectral develop greatly. The multispectral imaging equipment of unmanned aerial vehicle can
be used in mine detection, information, surveillance and reconnaissance. Spectral imaging spectrometer operating in
MWIR and LWIR has already been applied in the field of remote sensing and military in the advanced country.
The paper presents the technology of multispectral imaging. It can enhance the reflectance, scatter and radiation
character of the artificial targets among nature background. The targets among complex background and
camouflage/stealth targets can be effectively identified. The experiment results and the data of spectral imaging is
This document describes the simulation principle, outlines the design procedure of the projection optics system from predesign to achromatization. The Optical system collimates output from Liquid crystal light valve in 8~12μm and enables an imaging system to be tested out of 20°field of view. The effective focal length of this F/1.5 system is about 113mm. There is sufficient exit pupil distance to match projector exit pupil to the LWIR imagery system entrance pupil. A long working distance between Liquid crystal light valve and the optics system is approximately 120mm. The Modulation Transfer Function (MTF) and the geometric blur spot for three-field position repenting an on-axis point, a full field and an intermediate point show the better performance of the optical system.
How to turning down the heat of aircraft infrared picture, how to get stealthy. To make a stealthy aircraft, designers had to consider a lot of key ingredients.
This paper mainly introduces aircraft stealthy and discussed the efficiency of aircraft signature suppression. We describe testing process, measure and analyze the characteristics of aerosol scattering and absorption and present testing data of aircraft plume signature suppression. It covers the waveband from 2μm to 14μm. Another, infrared radiation temperature be minimized by a combination of temperature reduction and masking radiation temperature.
We have developed a new dynamic infrared scene projector using the Texas Instruments Digital Micromirror Device (DMD) which has been modified to project images which are suitable for testing sensor and seekers operating in the UV, visible, and IR wavebands. This paper provides an overview of the design and performance of the projection system, as well as example imagery from prototype projector systems. The dynamic IR scene contains 1024×768 pixels and can be updated at a rate of approximately 85 Hz.
A modular Infrared simulation test system has been developed for laboratory testing of a kind of UUT with Infrared (IR) sensors. This paper mainly focuses on the software development for the system. The software for the system is divided into two parts, i.e. the main control computer software and image generation computer software. The main control computer software is responsible for the software & hardware control, setup of the simulation test and the analysis of the simulation results. The image generation computer is responsible for the generation of static and dynamic IR image, the control of moving entities in IR simulation scene and the calculation of simulation data. The two computers use network communication to transfer commands and data. The modules and implementation methods for the software are described.
The SR5000 spectroradiometer addresses a wide variety of military, industrial and scientific applications that demand real-time, noncontact, highly accurate and highly sensitive measurements of object’s radiometric properties. It covers the waveband from 0.207~14.5m, has spectral resolution as fine as 2% and records over 30 spectra per second. In this paper, we describe the testing process and present results of the SR5000 spectroradiometer performance, for InSb/MCT/CVF8 infrared waveband (1.3~14.5m). We present testing data of the FOV flatness and symmetry, the spectral resolution and accuracy, the effective temperature and the noise equivalent temperature difference.
Detailed description of the structure, operation, fabrication, and performance of a fast-response metal-insulator-semiconductor structure mono-crystalline gallium arsenide as photo-addressing medium for infrared liquid crystal spatial light modulator (GaAs-IR-SLM) is reported. A GaAs-IR-SLM is demonstrated with a limiting resolution of 20 lp/mm over a 40 mm aperture and contrast ratios of greater than 20:1 in the 8 to approximately 12 μm wavelength.
Detailed description of the structure, operation and performance of single crystal silicon infrared liquid crystal light valve (IR-LCLV) is given. Experiment results obtained from an IR-LCLV utilizing Epson projector as the visible image input source and an extended IR source (blackbody) as the projection beam is presented. Spatial resolution is 20 lines/mm and dynamic temperature range is 80 degree(s)C above ambient.