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.

中文翻译：

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悬臂增强双梳光声光谱

双梳光声光谱 (DC-PAS) 通过以与波长无关的方式提供高灵敏度和紧凑尺寸来推进光谱测量。在这里，我们提出了一种新颖的悬臂增强型 DC-PAS 方案，采用基于光学悬臂的高灵敏度光纤声传感器和具有平坦响应特性的非谐振光声单元（PAC）。双梳下变频至音频范围，并且由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 方法具有灵敏度高、设计紧凑和抗电磁干扰等优点。通过 10 秒的平均时间，所提出的方法通过实验实现了乙炔 860 ppb 的最低检测限。该技术为以与波长无关的方式在紧凑的体积内对痕量气体进行高灵敏度检测提供了绝佳的机会。