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论文类型：期刊论文

发表时间：2022-06-28

发表刊物：光电子 激光

所属单位：光电工程与仪器科学学院

期号：7

页面范围：669-671

ISSN号：1005-0086

摘要：A CO-overtone laser based photoacoustic spectrometer was presented. The spectrometer consists of a tunable CO-overtone laser with a maximum intra-cavity power of 4 W for single line operation in the wavelength range of 2.8-4 ��m, an intra-cavity longitudinal resonant photoacoustic cell and a computer controlled signal detection and processing system. The spectrometer is applied to measure the concentration of methane (CH4) for demonstrating the high sensitivity of the system. A detection limit of 0.1 ppb(l��10-10) has been achieved thanks to the good spectral coincidence between laser lines and CH4 absorption lines and relatively high intra-cavity laser power.

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