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论文类型：期刊论文

发表时间：2019-03-15

发表刊物：SENSORS AND ACTUATORS B-CHEMICAL

收录刊物：SCIE、Scopus

卷号：283

页面范围：1-5

ISSN号：0925-4005

关键字：Trace gas detection; Photoacoustic spectroscopy; Near-infrared laser; Fiber-optic sensing; Cantilever microphone

摘要：A highly sensitive trace hydrogen sulfide (H2S) gas sensing scheme based on all-optical photoacoustic spectroscopy is demonstrated. A high-power erbium-doped fiber amplified near-infrared laser is used as a light source for acoustic excitation. Meanwhile, the second-harmonic photoacoustic signal is measured by a fiber-optic cantilever microphone which is equipped with a white-light interferometric readout. For sensitivity improvement, the demodulated digital photoacoustic signal is processed by a virtual lock-in amplifier. The continuous H2S measurement experiment shows the ability of real-time response. A detection limit is achieved to be 33 ppb with a 10 s measurement time at the wavelength of 1576.29 nm. With both the excitation light and the probe light being transmitted by optical fibers, the designed sensing system has the advantages of remote detection and immunity to electromagnetic interference.