Journal
OPTICS EXPRESS
Volume 29, Issue 16, Pages 25100-25108Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.434128
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Funding
- National Natural Science Foundation of China [61505041, 61875047, 62022032]
- Natural Science Foundation of Heilongjiang Province [YQ2019F006]
- Heilongjiang Provincial Postdoctoral Science Foundation [LBH-Q18052]
- Fundamental Research Funds for the Central Universities
- THORLABS GmbH within the joint-research laboratory PolySense
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In this paper, an ultra-highly sensitive light-induced thermoelastic spectroscopy (LITES)-based carbon monoxide (CO) sensor utilizing custom quartz tuning forks (QTFs) as photodetector, a multi-pass cell, and a mid-infrared quantum cascade laser (QCL) was reported for the first time. The system achieved minimum detection limits (MDLs) of 750 ppt, 4.6 ppb, and 5.8 ppb with different QTFs when the integration time was set at 200 ms. The most sensitive QTF showed an excellent linear response to CO concentration, indicating a promising sensor calibration result.
In this paper, we report on an ultra-highly sensitive light-induced thermoelastic spectroscopy (LITES)-based carbon monoxide (CO) sensor exploiting custom quartz tuning forks (QTFs) as a photodetector, a multi-pass cell and a mid-infrared quantum cascade laser (QCL) for the first time. The QCL emitting at 4.58 gm with output power of 145 mW was employed as exciting source and the multi-pass cell was employed to increase the gas absorption pathlength. To reduce the noise level, wavelength modulation spectroscopy (WMS) and second harmonic demodulation techniques were exploited. Three QTFs including two custom QTFs (#1 and #2) with different geometries and a commercial standard QTF (#3) were tested as photodetector in the gas sensor. When the integration time of the system was set at 200 ms, minimum detection limits (MDLs) of 750 part-per-trillion (ppt), 4.6 part-per-billion (ppb) and 5.8 ppb were achieved employing QTF #1 #2, and #3, respectively. A full sensor calibration was achieved using the most sensitive QTF#1, demonstrating an excellent linear response with CO concentration. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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