Author(s): Bai, YR (Bai, Yunrui); Yu, HJ (Yu, Haijuan); He, CJ (He, Chaojian); Miao, ZW (Miao, Zhangwang); Dou, R (Dou, Rui); Zhang, YT (Zhang, Yuting); Lin, XC (Lin, Xuechun)

Source: OPTIK Volume: 227 Article Number: 166006 DOI: 10.1016/j.ijleo.2020.166006 Published: FEB 2021

Abstract: A simulation model of the fiber-structure trace ammonia detection system based on near-infrared laser absorption spectroscopy is proposed. The distributed feed-back (DFB) diode laser modulation, photodetector, and signal processing are simulated by programming using matlab code while the noise amplitude selected to the sampling accuracy of commercial 12-bit ADC. The wavelength 1512 nm was selected to calculate the absorption coefficient of mixture containing ammonia, carbon dioxide, and water vapor. When the length of fiber-structure gas chamber was set to 10 cm, 1 m, and 10 m, respectively, ammonia with concentration from 0.2 ppm to 10,060 ppm can be detected. The dynamic range of this simulation have covered 5 orders of magnitude which never achieves in traditional detection system. Our work provides a potentially valuable option to establish the ammonia detection system of more portable, high sensitivity, and large detection range.

Accession Number: WOS:000651298800004

ISSN: 0030-4026

eISSN: 1618-1336

Full Text: https://www.sciencedirect.com/science/article/pii/S0030402620318192?via%3Dihub