| 光谱学与光谱分析 |
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| Research on Ground-Based LWIR Hyperspectral Imaging Remote Gas Detection |
| ZHENG Wei-jian1,2, LEI Zheng-gang1, YU Chun-chao1, YANG Zhi-xiong1, WANG Hai-yang1,2, FU Yan-peng1,2, LI Xun-niu1,2, LIAO Ning-fang2, SU Jun-hong1,2 |
1. Kunming Institute of Physics, Kunming 650223, China
2. School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract The new progress of ground-based long-wave infrared remote sensing is presented, which describes the windowing spatial and temporal modulation Fourier spectroscopy imaging in details. The prototype forms the interference fringes based on the corner-cube of spatial modulation of Michelson interferometer, using cooled long-wave infrared photovoltaic staring FPA (focal plane array) detector. The LWIR hyperspectral imaging is achieved by the process of collection, reorganization, correction, apodization, FFT etc. from data cube. Noise equivalent spectral radiance (NESR), which is the sensitivity index of CHIPED-1 LWIR hyperspectral imaging prototype, can reach 5.6×10-8 W·(cm-1·sr·cm2)-1 at single sampling. The data is the same as commercial temporal modulation hyperspectral imaging spectrometer. It can prove the advantage of this technique. This technique still has space to be improved. For instance, spectral response range of CHIPED-1 LWIR hyperspectral imaging prototype can reach 11.5 μm by testing the transmission curve of polypropylene film. In this article, choosing the results of outdoor high-rise and diethyl ether gas experiment as an example, the authors research on the detecting method of 2D distribution chemical gas VOC by infrared hyperspectral imaging. There is no observed diethyl ether gas from the infrared spectral slice of the same wave number in complicated background and low concentration. By doing the difference spectrum, the authors can see the space distribution of diethyl ether gas clearly. Hyperspectral imaging is used in the field of organic gas VOC infrared detection. Relative to wide band infrared imaging, it has some advantages. Such as, it has high sensitivity, the strong anti-interference ability, identify the variety, and so on.
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Received: 2014-09-11
Accepted: 2015-01-15
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Corresponding Authors:
ZHENG Wei-jian
E-mail: zwj866@139.com
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