Wang Jiapeng, Wu Hongpeng, Liu Xiaoli, Wang Gang, Wang Yong, Feng Chaofan, Cui Ruyue, Gong Zhenfeng, Dong Lei
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
Photoacoustics. 2024 Mar 21;38:100605. doi: 10.1016/j.pacs.2024.100605. eCollection 2024 Aug.
Dual-comb photoacoustic spectroscopy (DC-PAS) advances spectral measurements by offering high-sensitivity and compact size in a wavelength-independent manner. Here, we present a novel cantilever-enhanced DC-PAS scheme, employing a high-sensitivity fiber-optic acoustic sensor based on an optical cantilever and a non-resonant photoacoustic cell (PAC) featuring a flat-response characteristic. The dual comb is down-converted to the audio frequency range, and the resulting multiheterodyne sound waves from the photoacoustic effect, are mapped into the response frequency region of the optical cantilever microphone. This cantilever-enhanced DC-PAS method provides advantages such as high sensitivity, compact design, and immunity to electromagnetic interference. Through 10 seconds averaging time, the proposed approach experimentally achieved a minimum detection limit of 860 ppb for acetylene. This technology presents outstanding opportunities for highly sensitive detection of trace gases in a wavelength-independent manner, all within a compact volume.
双梳状光声光谱技术（DC-PAS）通过以与波长无关的方式提供高灵敏度和紧凑尺寸，推动了光谱测量的发展。在此，我们提出一种新颖的悬臂增强型DC-PAS方案，该方案采用基于光学悬臂的高灵敏度光纤声学传感器和具有平坦响应特性的非共振光声池（PAC）。双梳状信号被下变频到音频范围，并且光声效应产生的多外差声波被映射到光学悬臂麦克风的响应频率区域。这种悬臂增强型DC-PAS方法具有高灵敏度、紧凑设计以及抗电磁干扰等优点。通过10秒的平均时间，该方法在实验中实现了对乙炔860 ppb的最低检测限。这项技术为以与波长无关的方式在紧凑体积内对痕量气体进行高灵敏度检测提供了绝佳机会。
