Stand-off detection of ethanol by laser absorption spectrometry with interference-based internal standard

被引：0

作者：

Liu X. ^{[1
]}

Du Z. ^{[1
]}

Wang X. ^{[1
]}

Yuan L. ^{[1
]}

Huang L. ^{[1
]}

Li Y. ^{[1
]}

机构：

[1] School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin

来源：

Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2022年 / 51卷 / 12期

关键词：

broadband absorption; gaseous ethanol; open optical path; stand-off detection;

D O I：

10.3788/IRLA20220275

中图分类号：

学科分类号：

摘要：

Ethanol is a macromolecular volatile organic compound (VOC) with broadband absorption characteristics, which is always disturbed by the air background absorption for remote sensing. In this paper, it was proposed that a novel differential absorption spectroscopy for stand-off detection of VOCs with broadband absorption, in which accurately measured the interference spectrum and used as internal standard to correct the possible baseline offset and nonlinearity in the spectrometer. The method has been successfully applied to standoff detection of gaseous ethanol. An open-air experimental system was constructed with a DFB diode laser under laboratory conditions for the near-infrared characteristic absorption (7180 cm−1) of ethanol. The results showed that the measurement error of ethanol concentration was less than 3.5 ppm, and the detection limit of 2.6 ppm with the integration time 15.1 s by Allan variance evaluation, which was nearly 2 orders of magnitude lower than the lowest detection limit reported at present. The proposed method laid a foundation of highly sensitive miniaturized optical system for VOCs stand-off detection. © 2022 Chinese Society of Astronautics. All rights reserved.

引用

共 15 条

[1] Li J Y, Yu Z, Du Z H, Et al., Standoff chemical detection using laser absorption spectroscopy: A review, Remote Sens, 12, (2020)
[2] Alobaidi T A A, Hill D W., A helium-neon laser infrared analyser for alcohol vapour in the breath, Journal of Physics E:Scientific Instruments, 8, 1, pp. 30-32, (1975)
[3] Schuetz M, Bufton J, Prasad C R., A mid-IR DIAL system using interband cascade laser diodes, 2007 Quantum Electronics and Laser Science Conference, pp. 1-2, (2007)
[4] Mlynczak J, Kubicki J, Kopczynski K., Stand-off detection of alcohol vapors exhaled by humans, Sensors, 18, 5, (2018)
[5] Du Z H, Li J Y, Gao H, Et al., Ultrahigh-resolution spectroscopy for methyl mercaptan at the ν2-band by a distributed feedback interband cascade laser, Journal of Quantitative Spectroscopy and Radiative Transfer, 196, pp. 123-129, (2017)
[6] Wang Z H, Wang R X, Li J Y, Et al., Ultrahigh resolution spectroscopy for Dimethyl sulfide at the ν1- and ν8-bands by a distributed feedback interband cascade laser, Journal of Quantitative Spectroscopy and Radiative Transfer, 246, (2020)
[7] Gao H, Xie L, Gong P, Et al., Detection of ethanol using a tunable interband cascade laser at 3.345 μm, Photonic Sensors, 8, 4, pp. 303-309, (2018)
[8] Li S M, Sun L Q., Analysis of multi-component broadband absorbers based on wavelength modulation united absorption spectroscopy, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 255, (2021)
[9] Aseev O, Tuzson B, Looser H, Et al., High-precision ethanol measurement by mid-IR laser absorption spectroscopy for metrological applications, Optics Express, 27, 4, pp. 5314-5325, (2019)
[10] Nadezhdinskii A, Berezin A, Bugoslavsky Y, Et al., Application of near-IR diode lasers for measurement of ethanol vapor, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 55, 10, pp. 2049-2055, (1999)

← 1 2 →