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H-shaped acoustic micro-resonator-based quartz-enhanced photoacoustic spectroscopy

Yufei Ma, Yinghao Hong, Shunda Qiao, Ziting Lang, and Xiaonan Liu

Open Access Open Access

Abstract

An H-shaped acoustic micro-resonator (AmR)-based quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor is demonstrated for the first time. The H-shaped AmR has the advantages of easy optical alignment, high utilization of laser energy, and reduction in optical noise. The parameter of the H-shaped AmR is designed based on the standing wave enhancement characteristic. The performance of the H-shaped AmR-based QEPAS sensor system and bare quartz tuning fork (QTF)-based sensor system are measured under the same conditions by choosing water vapor (H2O) as the target gas. Compared with the QEAPS sensor based on a bare QTF, the detection sensitivity of the optimal H-shaped AmR-based QEPAS sensor exhibits a 17.2 times enhancement.

© 2022 Optica Publishing Group

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (4)
Fig. 1.
Fig. 1. (a) H-shaped AmR structure. (b) 3D diagram of T-shaped tube. (c) Top view of T-shaped tube. (d) Front view of T-shaped tube.

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Fig. 2.
Fig. 2. Diagram of experimental setup. FC, fiber collimator; AmR, acoustic micro-resonator; QTF, quartz tuning fork; Σ, adder; PC, personal computer.

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Fig. 3.
Fig. 3. Relationship between 2f signal amplitude and the length of branch tube L2 for the H-shaped AmR-based QEPAS sensor: (a) branch tube with inner diameter D2 of 0.5 mm; (b) branch tube with inner diameter D2 of 1 mm.

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Fig. 4.
Fig. 4. 2f signal of QEPAS sensors by using bare QTF, AmR7, and AmR7 without right-angle prism. The section framed by the red dotted line is noise.

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Tables (1)

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Table 1. Performance of H-Shaped AmRs Used in QEPAS Sensor a

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