Precision adjustment and scanning control method of interferometric imaging spectrometer with a variable gap

Hemin Meng; Jiaobo Gao; Nan Wang; Chunhui Pan; Jianghui Wu; Yujie Zhao; Fang Liu

doi:10.1117/12.2500536

24 July 2018 Precision adjustment and scanning control method of interferometric imaging spectrometer with a variable gap

Hemin Meng, Jiaobo Gao, Nan Wang, Chunhui Pan, Jianghui Wu, Yujie Zhao, Fang Liu

Author Affiliations +

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 1082709 (2018) https://doi.org/10.1117/12.2500536
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

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.

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Hemin Meng, Jiaobo Gao, Nan Wang, Chunhui Pan, Jianghui Wu, Yujie Zhao, and Fang Liu "Precision adjustment and scanning control method of interferometric imaging spectrometer with a variable gap ", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082709 (24 July 2018); https://doi.org/10.1117/12.2500536

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KEYWORDS

Spectroscopy

Interferometers

Prisms

Sensors

Interferometry

Imaging systems

Infrared imaging

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