Research on multi-channel weak interference signal detection circuit of Fourier transform infrared spectrometer

Ruilin Ding; Huiqin Shu; Peizhong Zhang; Jian Cui; Zhaoyang Guan; Boyang Wang; Zhenggang Lei

doi:10.1117/12.2606960

24 November 2021 Research on multi-channel weak interference signal detection circuit of Fourier transform infrared spectrometer

Ruilin Ding, Huiqin Shu, Peizhong Zhang, Jian Cui, Zhaoyang Guan, Boyang Wang, Zhenggang Lei

Author Affiliations +

Proceedings Volume 12064, AOPC 2021: Optical Spectroscopy and Imaging; 120640O (2021) https://doi.org/10.1117/12.2606960
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Fourier Transform Infrared(FTIR) spectroscopy has many advantages, such as high light flux, high resolution, high sensitivity and so on, and has been widely used in the field of industrial gas monitoring. Unit detector is used by traditional Fourier transform infrared spectrometer, which needs scanning platform to assist imaging, and the structure of spectrometer is complex. In order to satisfy the application of small area array detector spectrometer, this paper is based on the small area array HgCdTe photoconductive long wave infrared detector and double pendulum interferometer. The working principle and signal characteristics of the spectrometer are analyzed, and a method of multi-channel weak interference signal detection circuit for 4×4 small area array detector is proposed, and the method is simulated and verified by experiments. Using Multisim software to simulate the circuit, the results show that the circuit has good band-pass characteristics and can achieve distortion-free signal amplification. The collected interference data are analyzed by using MATLAB software, and the interference data are subjected to spectral restoration and spectral calibration. The results show that the amplitude consistency and phase consistency of the interference data are good, and the spectral waveforms of each channel are close to each other, which can well distinguish and measure the long wave characteristic peaks in the region.

Citation Download Citation

Ruilin Ding, Huiqin Shu, Peizhong Zhang, Jian Cui, Zhaoyang Guan, Boyang Wang, and Zhenggang Lei "Research on multi-channel weak interference signal detection circuit of Fourier transform infrared spectrometer", Proc. SPIE 12064, AOPC 2021: Optical Spectroscopy and Imaging, 120640O (24 November 2021); https://doi.org/10.1117/12.2606960

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KEYWORDS

Signal detection

Sensors

Spectroscopy

Infrared detectors

Infrared radiation

Infrared sensors

Infrared spectroscopy

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