Journal
PHOTOACOUSTICS
Volume 27, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2022.100381
Keywords
Hydrogen chloride; Quartz tuning fork; Multi-pass cell; Gas sensing; Light-induced thermoelastic spectroscopy
Categories
Funding
- National Natural Science Foundation of China [62022032, 61875047, 61505041]
- Natural Science Foundation of Heilongjiang Province of China [YQ2019F006]
- Fundamental Research Funds for the Central Universities
- Heilongjiang Province Postdoctoral Foundation [LBH-Q18052]
- THORLABS GmbH, within PolySense, a joint -research laboratory
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In this paper, an ultra-highly sensitive light-induced thermoelastic spectroscopy (LITES) based HCl sensor using a custom low-frequency QTF and a fiber-coupled MPC was demonstrated. The results showed that the low-frequency QTF provided improved signal enhancement compared to a standard QTF, and the fiber-coupled MPC enhanced system robustness. The sensor exhibited an excellent linear response to HCl gas concentration.
In this paper, an ultra-highly sensitive light-induced thermoelastic spectroscopy (LITES) based hydrogen chloride (HCl) sensor, exploiting a custom low-frequency quartz tuning fork (QTF) and a fiber-coupled multi-pass cell (MPC) with optical length of 40 m, was demonstrated. A low resonant frequency of 2.89 kHz of QTF is advantageous to produce a long energy accumulation time in LITES. Furthermore, the use of an MPC with the fibercoupled structure not only avoids the difficulty in optical alignment but also enhances the system robustness. A distributed feedback (DFB) diode laser emitting at 1.74 mu m was used as the excitation source. Under the same operating conditions, the using of low-frequency QTF provided a similar to 2 times signal improvement compared to that achieved using a standard 32 kHz QTF. At an integration time of 200 ms, a minimum detection limit (MDL) of 148 ppb was achieved. The reported sensor also shows an excellent linear response to HCl gas concentration in the investigated range.
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