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Article

Investigation and Optimization of a Line-Locked Quartz Enhanced Spectrophone for Rapid Carbon Dioxide Measurement

1
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Pietro Patimisco
Sensors 2021, 21(15), 5225; https://doi.org/10.3390/s21155225
Received: 8 July 2021 / Revised: 28 July 2021 / Accepted: 29 July 2021 / Published: 2 August 2021
(This article belongs to the Special Issue State-of-the-Art Optical Sensors Technology in China 2021-2022)
We have developed a rapid quartz enhanced spectrophone for carbon dioxide (CO2) measurement, in which the laser wavelength was tightly locked to a CO2 absorption line and a custom quartz tuning fork (QTF) operating at 12.5 kHz was employed. The intrinsic QTF oscillation-limited response time, as well as the optimal feedback interval, was experimentally investigated. By tightly locking the laser to the R(16) transition of CO2, we obtained a stable laser operation with its center wavelength variation kept within 0.0002 cm−1, merely three times the laser linewidth. The reported CO2 sensor achieved a detection limit of 7 ppm, corresponding to a normalized noise equivalent absorption coefficient (NNEA) of 4.7 × 10−9 W·cm−1·Hz−1/2, at a response time of 0.5 s. The detection limit can be further improved to 0.45 ppm at an integration time of 270 s, illustrating a good system stability. This spectrophone enables the realization of compact and fast-response gas sensors for many scenarios, where CO2 concentration from sub-ppm to hundreds of thousands of ppm is expected. View Full-Text
Keywords: quartz enhanced photoacoustic spectroscopy; carbon dioxide; custom quartz tuning fork; wavelength locking; laser spectroscopy quartz enhanced photoacoustic spectroscopy; carbon dioxide; custom quartz tuning fork; wavelength locking; laser spectroscopy
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MDPI and ACS Style

Zhang, H.; Jin, W.; Hu, M.; Hu, M.; Liang, J.; Wang, Q. Investigation and Optimization of a Line-Locked Quartz Enhanced Spectrophone for Rapid Carbon Dioxide Measurement. Sensors 2021, 21, 5225. https://doi.org/10.3390/s21155225

AMA Style

Zhang H, Jin W, Hu M, Hu M, Liang J, Wang Q. Investigation and Optimization of a Line-Locked Quartz Enhanced Spectrophone for Rapid Carbon Dioxide Measurement. Sensors. 2021; 21(15):5225. https://doi.org/10.3390/s21155225

Chicago/Turabian Style

Zhang, Hui, Wenling Jin, Mengpeng Hu, Mai Hu, Jingqiu Liang, and Qiang Wang. 2021. "Investigation and Optimization of a Line-Locked Quartz Enhanced Spectrophone for Rapid Carbon Dioxide Measurement" Sensors 21, no. 15: 5225. https://doi.org/10.3390/s21155225

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