Super tiny quartz-tuning-fork-based light-induced thermoelastic spectroscopy sensing

Qiao, Shundra and Ma, Pengze and Tsepelin, Viktor and Han, Guowei and Liang, Jinxing and Ren, Wei and Zheng, Huadan and Ma, Yufei (2023) Super tiny quartz-tuning-fork-based light-induced thermoelastic spectroscopy sensing. Optics Letters, 48 (2). pp. 419-422. ISSN 0146-9592

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In this Letter, a sensitive light-induced thermoelastic spectroscopy (LITES)-based trace gas sensor by exploiting a super tiny quartz tuning fork (QTF) was demonstrated. The prong length and width of this QTF are 3500 µm and 90 µm, respectively, which determines a resonant frequency of 6.5 kHz. The low resonant frequency is beneficial to increase the energy accumulation time in a LITES sensor. The geometric dimension of QTF on the micrometer scale is advantageous to obtain a great thermal expansion and thus can produce a strong piezoelectric signal. The temperature gradient distribution of the super tiny QTF was simulated based on the finite element analysis and is higher than that of the commercial QTF with 32.768 kHz. Acetylene (C2H2) was used as the analyte. Under the same conditions, the use of the super tiny QTF achieved a 1.64-times signal improvement compared with the commercial QTF. The system shows excellent long-term stability according to the Allan deviation analysis, and a minimum detection limit (MDL) would reach 190 ppb with an integration time of 220 s.

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Journal Article
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Optics Letters
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© 2023 Optica Publishing Group. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
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?? yes - externally fundedatomic and molecular physics, and optics ??
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Deposited On:
09 Jan 2023 16:25
Last Modified:
30 Apr 2024 00:15