Highly sensitive photoacoustic gas sensor based on near-concentric cavity

光学 同心的 材料科学 生物医学中的光声成像 物理 几何学 数学
作者
Ganshang Si,Yanchun Wang,Li Xu,Changwei Sun,Haiping Xu,Zhengang Li
出处
期刊:Optics Express [Optica Publishing Group]
卷期号:32 (13): 22759-22759
标识
DOI:10.1364/oe.525307
摘要

The precise detection of trace gases in the atmosphere is vital for both environmental preservation and human health. Addressing the inherent challenges in enhancing the sensitivity of photoacoustic spectroscopy, a highly sensitive photoacoustic gas detection method utilizing a near-concentric cavity was proposed. By constructing a near-concentric optical cavity, laser reflections within the photoacoustic cell were substantially amplified, resulting in enhanced sensitivity of photoacoustic signal detection. Additionally, to align with the optical path characteristics of the near-concentric cavity, a miniaturized dumbbell-like photoacoustic cell was designed. Characterized by its high-frequency resonance, this design effectively mitigated background noise while maintaining a high sound pressure level. Experimental results demonstrated a remarkable enhancement in both signal intensity and signal-to-noise ratio by factors of 22.06 and 21.26, respectively, compared to traditional excitation methods. According to the 1 σ standard, with a laser power of 21 mW, the setup achieved a detection limit of 10.15 ppb for NO 2 . The corresponding normalized noise equivalent absorption was calculated to be 2.84 × 10 −9 cm −1 WHz −1/2 , with a gas consumption rate of merely 15.19 mL.
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