Wu Guojie, Zhang Yongjia, Gong Zhenfeng, Fan Yeming, Xing Jiawei, Wu Xue, Ma Junsheng, Peng Wei, Yu Qingxu, Mei Liang
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, Liaoning, China.
School of Dalian University of Technology and Belarusian State University Joint Institute, Dalian University of Technology, Dalian, Liaoning 116024, China.
Photoacoustics. 2024 Feb 9;37:100595. doi: 10.1016/j.pacs.2024.100595. eCollection 2024 Jun.
This paper reports a mini-resonant photoacoustic sensor for high-sensitivity trace gas sensing. The sensor primarily contains a sphere-cylinder coupled acoustic resonator, a cylindrical buffer chamber, and a fiber-optic acoustic sensor. The acoustic field distributions of this mini-resonant photoacoustic sensor and the conventional T-type resonant photoacoustic sensor have been carefully evaluated, showing that the first-order resonance frequency of the present mini-resonant photoacoustic sensor is reduced by nearly a half compared to that of the T-type resonant photoacoustic sensor. The volume of the developed photoacoustic cavity is only about 0.8 cm. Trace methane is selected as the target analytical gas and a detection limit of 101 parts-per-billion at 100-s integration time has been achieved, corresponding to a normalized noise equivalent absorption (NNEA) coefficient of 1.04 × 10 W·cm·Hz. The developed mini-resonant photoacoustic sensor provides potential for high-sensitivity trace gas sensing in narrow spaces.
本文报道了一种用于高灵敏度痕量气体传感的微型共振光声传感器。该传感器主要包括一个球-柱耦合声谐振器、一个圆柱形缓冲腔和一个光纤声传感器。对这种微型共振光声传感器和传统T型共振光声传感器的声场分布进行了仔细评估，结果表明，与T型共振光声传感器相比，当前微型共振光声传感器的一阶共振频率降低了近一半。所开发的光声腔体积仅约为0.8立方厘米。选择痕量甲烷作为目标分析气体，在100秒积分时间下实现了101十亿分之一的检测限，对应归一化噪声等效吸收（NNEA）系数为1.04×10瓦特·厘米·赫兹。所开发的微型共振光声传感器为在狭窄空间内进行高灵敏度痕量气体传感提供了潜力。
