Highly Sensitive Trace Gas Detection Based on In-Plane Single-Quartz-Enhanced Dual Spectroscopy

Tao, Liang; Qiao, Shunda; Lang, Ziting; Ma, Yufei

doi:10.3390/s22031035

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…Photoacoustic spectroscopy (PAS) based on infrared absorption spectroscopy [1][2][3][4][5] is one of the most sensitive techniques for trace gas detection due to its fast response time and good selectivity. [6][7][8][9][10] In PAS, laser energy is absorbed by gas molecules at the absorption line wavelength, causing them to undergo energy level transitions and release heat. Modulated light causes periodic changes in the heat released by the gas molecules, which generates acoustic waves.…”

Section: Introductionmentioning

confidence: 99%

Research on temperature and pressure interference in photoacoustic spectroscopy gas detection

Ye,

Luo,

Liu

et al. 2023

Micro & Optical Tech Letters

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Photoacoustic spectroscopy (PAS) is a highly sensitive optical detection technique for trace gases. However, PAS is sensitive to environmental factors such as temperature and pressure during actual measurement. In this paper, we study the interference characteristics of temperature and pressure in PAS gas detection. The influence of pressure and temperature on PAS is theoretically analyzed based on the basic principle of gas photoacoustic spectroscopy. The effect of different pressure and temperature conditions on the resonance frequency and signal amplitude of PAS is studied through COMSOL software simulation and validated through experiments. Results show that changes in temperature and pressure will affect the resonance frequency and signal amplitude of PAS, thereby impacting the system's sensitivity and accuracy. To reduce the impact of temperature on the PAS sensor, a temperature compensation model was derived based on experimental analysis. Real‐time temperature detection is used to compensate for the photoacoustic signal based on temperature changes, which can improve the accuracy and stability of photoacoustic spectroscopy gas detection. For 5% CO2, the photoacoustic signal and experimental temperature data were measured for 3612 s, and after temperature compensation, the detection limit was 0.0192% at an integration time of 365 s, which is 0.0128% higher than before temperature compensation. The system's normalized noise equivalent absorption coefficient is 3.30 × 10−8 cm−1 WHz−1/2. This research improves the accuracy and reliability of photoacoustic spectroscopy gas detection technology and provides useful references for temperature correction in similar gas detection fields.

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Section: Introductionmentioning

confidence: 99%

Research on temperature and pressure interference in photoacoustic spectroscopy gas detection

Ye,

Luo,

Liu

et al. 2023

Micro & Optical Tech Letters

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“…Spectroscopy detection technology is an effective method for gas detection 1–8 . For the waveguide sensor based on evanescent field absorption, the small size makes the sensor portable 9–13 .…”

Section: Introductionmentioning

confidence: 99%

“…Spectroscopy detection technology is an effective method for gas detection. [1][2][3][4][5][6][7][8] For the waveguide sensor based on evanescent field absorption, the small size makes the sensor portable. [9][10][11][12][13] However, the small size and waveguide loss limit the optical path length of a waveguide sensor.…”

Section: Introductionmentioning

confidence: 99%

Theoretical research of chalcogenide pedestal waveguide gas sensor

Liu

Zheng

2022

Micro & Optical Tech Letters

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A rectangular waveguide with a small external confinement factor (γ) limits the gas sensing performance. The fabrication process of a suspended waveguide with large γ is complex. Pedestal waveguide can be fabricated by wet etching on the basis of a rectangular waveguide, which makes full use of the target analyte area under the core layer and increases γ. The TM mode chalcogenide pedestal waveguide was optimized to obtain a large γ. The γ of the optimized TM mode pedestal waveguide is 55.7% and the limit of detection of methane (CH 4 ) for a 1 cm-long waveguide is 1.67%. The fabrication tolerance of the pedestal waveguide was analyzed. The pedestal radius error has a great influence on sensing performance. This work provides a method for the design and performance analysis of a pedestal waveguide sensor.

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“…In the eleventh invited paper, by Liang et al [ 11 ], an in-plane single-quartz-enhanced dual spectroscopy (IP-SQEDS)-based trace gas sensor was demonstrated for the first time. A single quartz tuning fork (QTF) was employed to combine in-plane quartz-enhanced photoacoustic spectroscopy (IP-QEPAS) with light-induced thermoelastic spectroscopy (LITES) techniques.…”

mentioning

confidence: 99%