Broadband gas absorption spectrometer based on spatial dispersion with sub-ms time resolution

Zhiwei Liu; Xuyang Wu; Hongda Chen; Gangyun Guan; Guofeng Yan; Chuantao Zheng

doi:10.1117/12.2687712

27 November 2023 Broadband gas absorption spectrometer based on spatial dispersion with sub-ms time resolution

Zhiwei Liu, Xuyang Wu, Hongda Chen, Gangyun Guan, Guofeng Yan, Chuantao Zheng

Proceedings Volume 12771, Advanced Sensor Systems and Applications XIII; 1277111 (2023) https://doi.org/10.1117/12.2687712
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

A spatial light dispersion-based spectrometer is experimentally demonstrated for broadband gas absorption spectroscopy with time resolving capability. A diffraction grating combining with a plane-array camera serves as the spatial dispersion system operated in the near-infrared (NIR) waveband. Spectrum with a bandwidth of 40 nm can be acquired via a single exposure of the camera running in the line mode with 640 ×4 pixels. With the data stream transmitted to the computer and stored in real time, the time resolution for continuous spectrum measurement reaches 200 μs, which is validated by monitoring the spectral evolution of a broadband amplified spontaneous emission (ASE) under impulsive intensity modulation. Adopting the ASE light source and a multi-pass gas cell, carbon monoxide (CO) absorption is spectrally characterized with a 16-nm bandwidth, and the gas concentration retrieval based on the entire obtained absorption spectrum is performed, in which an averaged mean absolute percentage error (MAPE) of 5.6% is achieved.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhiwei Liu, Xuyang Wu, Hongda Chen, Gangyun Guan, Guofeng Yan, and Chuantao Zheng "Broadband gas absorption spectrometer based on spatial dispersion with sub-ms time resolution", Proc. SPIE 12771, Advanced Sensor Systems and Applications XIII, 1277111 (27 November 2023); https://doi.org/10.1117/12.2687712

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