Ultra-sensitive ppb-level methane detection based on NIR all-optical photoacoustic spectroscopy by using differential fiber-optic microphones with gold-chromium composite nanomembr... by Hanping Xiao, Jinbiao Zhao, Chaotan Sima, Ping Lu, Yanhong Long, Yan Ai, Wanjin Zhang, Yufeng Pan, Jiangshan Zhang, Deming Liu

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