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Proceedings Paper

Precision adjustment and scanning control method of interferometric imaging spectrometer with a variable gap
Author(s): Hemin Meng; Jiaobo Gao; Nan Wang; Chunhui Pan; Jianghui Wu; Yujie Zhao; Fang Liu
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Paper Abstract

An infrared imaging spectrometer based on a variable gap interferometer is introduced, which is working in 7.7μm~14μm, and often used in spectral measurement, camouflage target detection and gas component identification. In this paper, the wedge prism shapes processed by grinding and diamond knife turning is compared, which affects the phase distribution near zero phase of the interferogram, and results in the difference of spectrum in the result. Finally, the turning process with less damage to the sharp edges was selected. An adjusting device and monitoring software are designed to ensure the symmetry of the wedge angle of the interference cavity with variable gap, so that two sides of the interferogram are sampled at equal intervals. The working mode is designed as the interferometer’s linear translation scan inside the imaging spectrometer. This working mode can reduce the volume of the system, and decrease the noise caused by the nonuniformity of the FPA response, improving signal-to-noise ratio. Stepper motor, rail and slide block are used to realize uniform reciprocating scanning. Finally, some measurement results using this infrared imaging spectrometer are presented.

Paper Details

Date Published: 24 July 2018
PDF: 6 pages
Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082709 (24 July 2018); doi: 10.1117/12.2500536
Show Author Affiliations
Hemin Meng, Xi'an Institute of Applied Optics (China)
Jiaobo Gao, Xi'an Institute of Applied Optics (China)
Nan Wang, Xi'an Institute of Applied Optics (China)
Chunhui Pan, Xi'an Institute of Applied Optics (China)
Jianghui Wu, Xi'an Institute of Applied Optics (China)
Yujie Zhao, Xi'an Institute of Applied Optics (China)
Fang Liu, Xi'an Institute of Applied Optics (China)


Published in SPIE Proceedings Vol. 10827:
Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018)
Yingjie Yu; Chao Zuo; Kemao Qian, Editor(s)

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