Light intensity correction for light-induced thermoelastic spectroscopy based on nonlinear response of light intensity

被引：0

作者：

Chen X. ^{[1
]}

Liu H. ^{[1
,2
]}

Yao L. ^{[1
]}

Xu Z. ^{[1
]}

Hu M. ^{[3
]}

Kan R. ^{[1
]}

机构：

[1] Hefei Institute of Physical Science, Chinese Academy of Sciences, Hefei

[2] University of Science and Technology of China, Hefei

[3] The Chinese University of Hong Kong, Hong Kong

来源：

Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2024年 / 32卷 / 03期

关键词：

harmonic signal; ight intensity correction; light-induced thermoelastic spectroscopy; nonlinear response; polynomial fitting;

D O I：

10.37188/OPE.20243203.0317

中图分类号：

学科分类号：

摘要：

This study presents a method for correcting light intensity in light-induced thermoelastic spectroscopy (LITES) using a nonlinear light intensity response, enabling precise light intensity corrections. The DFB laser, set to a wavelength modulation mode at a frequency of 16369.75 Hz, benefits from enhanced nonlinear light intensity due to a fiber amplifier. The laser beam traverses a multi-pass cell before focusing on the quartz tuning fork (QTF) base, generating a thermoelastic signal. A lock-in amplifier demodulates the harmonic signal, and polynomial fitting of the harmonic signal's baseline extracts harmonics related to both concentration and light intensity. Experimental data reveal a strong linear correlation (coefficient > 0.998) between the baseline amplitude of the harmonic signal and light intensity as it varies from 22.03 mW to 3.16 mW, with normalized harmonic signal amplitude variation under 0.37%. In methane detection, the system demonstrates a robust linear response across a broad concentration range, with harmonic signal noise ratios indicating a detection threshold as low as 0.22×10-6. This research offers a novel approach for LITES light intensity correction, significantly enhancing system stability for prolonged measurements. © 2024 Chinese Academy of Sciences. All rights reserved.

引用

页码：317 / 323

页数：6

共 20 条

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