A design of temporally and spatially modulated infrared Fourier transform imaging spectrometer using subpixel supersampling

Lizhong Wei; Ningfang Liao; Wenmin Wu; Qiumei Fan

doi:10.1117/12.3045317

13 December 2024 A design of temporally and spatially modulated infrared Fourier transform imaging spectrometer using subpixel supersampling

Lizhong Wei, Ningfang Liao, Wenmin Wu, Qiumei Fan

Author Affiliations +

Proceedings Volume 13493, AOPC 2024: Infrared Technology and Applications; 1349302 (2024) https://doi.org/10.1117/12.3045317
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

The spectral resolution of The Temporally and Spatially Modulated Fourier Transform Imaging Spectrometer (TSMFTIS) is mainly determined by the optical focal length, lateral shear, and the performance of the infrared focal plane array (FPA) in combination. However, due to the limited number and density of pixels in the FPA, the lateral shear of the optical system is constrained, resulting in the overall spectral resolution of the instrument unable to be higher. Therefore, this paper proposes achieving super-sampling of the detector for interference images by performing multiple subpixel shifts on the FPA detector. This method supports the continuous increase of lateral shear amount, ultimately improving the overall spectral resolution of the instrument. Experimental results show that using a 384x288 uncooled infrared FPA and under conditions of eightfold super-sampling and 8000μm lateral shear, the instrument's spectral resolution increased from 15.75 cm-1 to 2.31 cm-1.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Lizhong Wei, Ningfang Liao, Wenmin Wu, and Qiumei Fan "A design of temporally and spatially modulated infrared Fourier transform imaging spectrometer using subpixel supersampling", Proc. SPIE 13493, AOPC 2024: Infrared Technology and Applications, 1349302 (13 December 2024); https://doi.org/10.1117/12.3045317

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KEYWORDS

Spectral resolution

Sensors

Staring arrays

Equipment

Spectroscopy

Modulation

Fourier transforms

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