Breath Analysis Using Laser Spectroscopy Techniques: Development and Future

Chenyu, 姜琛昱 Jiang; Meixiu, 孙美秀 Sun; Yingxin, 李迎新 Li; Chuji, 王储记 Wang

doi:10.3788/cjl201845.0207015

Cited by 4 publications

(1 citation statement)

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“…As a novel method of high-sensitivity gas detection, the tunable diode laser absorption spectroscopy (TDLAS) technology has the advantages of non-contact, high selectivity, high sensitivity, rapidity, high efficiency, long calibration period and dynamic detection 13 , 14 , which allows simultaneous detection of multiple gases 15 , 16 . There have been extensive studies concerning the TDLAS gas detection both in China as well as other countries 17 – 19 . Given the importance of ethylene in industry, agriculture and environmental protection, its measurement based on TDLAS has received growing attention in recent years.…”

Section: Introductionmentioning

confidence: 99%

A multiline fitting method for measuring ethylene concentration based on WMS-2f/1f

Wang,

Yang,

Liu

et al. 2023

Sci Rep

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Coal spontaneous combustion risk assessment is a global technical challenge for the sustainable development of deep mining technology, and C2H4 is a key indicator for early warning of coal spontaneous combustion. Tunable diode laser absorption spectroscopy (TDLAS) has the advantages of high selectivity, high sensitivity, high accuracy and real-time on-line measurement, and it can detect multiple gases simultaneously, so it has significant advantages in the accurate detection of coal spontaneous combustion indicator gases. To address the problem of cross-interference between the near-infrared absorption lines of CH4 and C2H4, which are the indicator gases of spontaneous combustion in coal, a multi-line fitting method was proposed in this study to calibrate the concentration of C2H4. The high-precision Environics2000 automatic standard gas dispenser from the United States, which has a built-in CPU computer control and data control and processing system, was used. Its gas concentration accuracy: ± 1.0%, gas flow accuracy: ± 1.0%, gas repeatability accuracy: ± 1.0%, flow linearity accuracy: ± 0.5%, and inlet operating pressure: minimum 10 psig (0.67 bar) ~ 75 psig (5.04 bar). The measured and simulated WMS-2f/1f signals were multilinearly fitted using a multilinear fitting algorithm and wavelength modulation spectroscopy (WMS), and the measurement of C2H4 concentration was achieved based on the extracted spectral line information. The results show that the maximum relative error of C2H4 concentration measurement is 2.40%, which is 54% lower than that of the conventional 2f peak measurement method, thus demonstrating the effectiveness of the multilinear fitting algorithm in the inversion of C2H4 concentration under the interference of absorption lines. In addition, this study has far-reaching implications for the application of TDLAS technology in the accurate detection of coal spontaneous combustion indicator gases.

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