Mr. Chao Wang Profile

Chao Wang

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Proceedings Article | 22 January 2025 Paper

Resonance enhanced photoacoustic spectroscopy with thin film

Yaohong Zhao, Yihua Qian, Guobin Zhong, Chao Wang, Zhi Li, Qing Wang

Proceedings Volume 13520, 135200T (2025) https://doi.org/10.1117/12.3057198

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Resonance-enhanced photoacoustic spectroscopy with thin films is an extension of Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS). This technique introduces a resonant coupling between a medium-enhanced Quartz Tuning Fork (QTF) and an acoustic micro-resonator (AmR). In QEPAS, the QTF resonates with the AmR through air, and the strength of this coupling determines the enhancement effect when the AmR is introduced. In this letter, an elastic parylene film was synthesized and applied to the slit of the AmR, with the QTF contact with the film. The pressure distribution within the AmR for different sizes and the resonant frequency of the parylene film were analyzed using Finite Element Modeling (FEM). With the optimized coupling, the elastic parylene film effectively enhanced the resonance between the QTF and the AmR. Additionally, the film acted as a barrier, separating the QTF from the detection gas, which is crucial for the long-term operation of QEPAS in environments with corrosive and dusty gas.

Proceedings Article | 22 January 2025 Paper

Quartz enhanced photoacoustic spectrophone employing conical acoustic resonator

Yaohong Zhao, Yihua Qian, Guobin Zhong, Chao Wang, Zhi Li, Qing Wang

Proceedings Volume 13520, 135200V (2025) https://doi.org/10.1117/12.3057206

KEYWORDS: Acoustics, Laser resonators, Resonators, Photoacoustic spectroscopy, Design, Quartz, Sensors, Acoustic waves, Environmental sensing, Signal to noise ratio

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Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) is a highly sensitive technique for trace gas detection and environmental monitoring, leveraging the piezoelectric properties of a Quartz Tuning Fork (QTF) to convert acoustic signals into electrical signals. Traditional QEPAS configurations often face limitations due to environmental noise interference and stringent requirements on laser beam quality. In this work, we present a novel QEPAS spectrophone design incorporating a conical acoustic resonator positioned perpendicularly to the QTF axis and located on one side of the QTF prongs. The conical resonator features a gradual change in cross-sectional area, enhancing acoustic impedance matching and concentrating acoustic energy at the QTF, thereby amplifying the photoacoustic signal. Finite Element Method (FEM) simulations were conducted to model the acoustic field distribution within the resonator, revealing that the acoustic pressure at the QTF prongs increases with the inner radius of the resonator's second side up to an optimal value. The conical acoustic resonator offers superior performance over traditional cylindrical designs, providing enhanced sensitivity, noise reduction, and greater flexibility in practical applications of QEPAS sensors.

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