Journal
PHOTOACOUSTICS
Volume 21, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2020.100230
Keywords
Infrared spectroscopy; Absorption spectroscopy; Methane detection; Light-induced thermo-elastic spectroscopy (LITES)
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Funding
- National Key R&D Program of China [2017YFB0405300]
- National Natural Science Foundation of China [61960206004, 61775079, 61627823]
- Key Science and Technology R&D program of Jilin Province, China [20180201046GX, 20190101016JH, 20200401059GX]
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A novel wavelength-locked light-induced thermo-elastic spectroscopy (WL-LITES) gas sensor system was proposed for long-distance methane detection, achieving low detection limits and fast response times.
A wavelength-locked light-induced thermo-elastic spectroscopy (WL-LITES) gas sensor system was proposed for long-distance in-situ methane (CH4) detection using a fiber-coupled sensing probe. The wavelength-locked scheme was used to speed the sensor response without scanning the laser wavelength across the CH4 absorption line. A small-size piezoelectric quartz tuning fork (QTF) with a wide spectral response range was adopted to enhance the photo-thermal signal. The optical excitation parameters of the QTF were optimized based on experiment and simulation for improving the signal-to-noise ratio of the LITES technique. An Allan deviation analysis was employed to evaluate the limit of detection of the proposed sensor system. With a 0.3 s lock-in integration time and a - 100 m optical fiber, the WL-LITES gas sensor system demonstrates a minimum detection limit (MDL) of - 11 ppm in volume (ppmv) for CH4 detection, and the MDL can be further reduced to - 1 ppmv with an averaging time of - 35 s. A real-time in-situ monitoring of CH4 leakage reveals that the proposed sensor system can realize a fast response (< 12 s) for field application.
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