Photoacoustic spectroscopy (PAS) is a boomingly developed spectroscopic method for trace gas analysis in the past decades. Unlike traditional laser absorption spectroscopy, an acoustic transducer is employed to detect the acoustic waves instead of optical waves. Microphone is a commonly used transducer to convert the acoustic signal into electrical signal, which is related to the gas concentration. In recent years, piezoelectric materials are playing important roles in the acoustic-to-electrical conversion process of photoacoustic system. In this article, recently used transducers in PAS such as quartz tuning fork, polyvinylidene fluoride, lead zirconate titanate, electromechanical film and LiNbO₃, BiB₃O₆, NbCOB crystals are summarized and discussed in detail. The different spectrophone configuration, schematic diagram, and experimental system are reported. Side by side comparison is carried out to show the gas sensing performance of these piezoelectric transducers.

中文翻译：

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压电换能器在光声光谱微量气体分析中的应用

光声光谱 (PAS) 是过去几十年中蓬勃发展的用于痕量气体分析的光谱方法。与传统的激光吸收光谱不同，采用声换能器来检测声波而不是光波。麦克风是一种常用的换能器，用于将声信号转换为电信号，电信号与气体浓度有关。近年来，压电材料在光声系统的声电转换过程中发挥着重要作用。在本文中，最近在PAS中使用的换能器如石英音叉、聚偏二氟乙烯、锆钛酸铅、机电薄膜和LiNbO ₃、BiB ₃ O ₆, NbCOB 晶体进行了详细的总结和讨论。报告了不同的分光器配置、示意图和实验系统。进行并排比较以显示这些压电换能器的气体传感性能。