Author(s): Qiao, SD (Qiao, Shunda); Ma, PZ (Ma, Pengze); Tsepelin, V (Tsepelin, Viktor); Han, GW (Han, Guowei); Liang, JX (Liang, Jinxing); Ren, W (Ren, Wei); Zheng, HD (Zheng, Huadan); Ma, YF (Ma, Yufei)

Source: OPTICS LETTERS Volume: 48  Issue: 2  Pages: 419-422  DOI: 10.1364/OL.482351  Published: JAN 15 2023 

Abstract: In this Letter, a sensitive light-induced thermoelastic spec-troscopy (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 mu m and 90 mu m, 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 dis-tribution of the super tiny QTF was simulated based on the finite element analysis and is higher than that of the com-mercial 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 com-pared 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. (c) 2023 Optica Publishing Group

Accession Number: WOS:000996112200009

PubMed ID: 36638472

Author Identifiers:

Author Web of Science ResearcherID ORCID Number

Ren, Wei  K-2231-2015   0000-0001-6681-593X

ISSN: 0146-9592

eISSN: 1539-4794