基于可调谐激光二极管吸收光谱的乙炔在线检测系统

发布时间：2018-08-07 08:16

【摘要】：基于可调谐半导体激光吸收光谱技术,研制了一种近红外乙炔气体检测系统。通过分析近红外波段乙炔分子的吸收谱线特性,选择了1.534μm附近乙炔分子的吸收峰作为吸收谱线。该系统主要由分布反馈激光器、激光器驱动器、单光程对射式气室、光电探测模块及数字式锁相放大器构成。为了测试该检测系统的性能,配备了乙炔气体样品并开展了气体检测实验。实验结果显示,该系统的最小检测下限为0.02%;在体积分数为0.02%~1%范围内,二次谐波幅值与乙炔气体浓度呈现出良好的线性关系。通过长达20h的稳定性实验测试了检测系统稳定性。鉴于近红外波段石英光纤传输损耗很小,可以将气室及光路部分与电路部分分离,从而可以进行远程气体检测,这是基于量子级联激光器、热光源的乙炔检测系统难以实现的。该系统采用了自主研制的分布反馈激光器驱动器和锁相放大器,结构简单,性价比高,便与集成,在工业现场乙炔浓度检测方面有着良好的应用前景。
[Abstract]:Based on tunable semiconductor laser absorption spectroscopy, a near infrared acetylene gas detection system is developed. The absorption peak of acetylene molecule near 1.534 渭 m is selected as the absorption line by analyzing the absorption line characteristics of acetylene molecule in near infrared band. The system consists of a distributed feedback laser, a laser driver, a single optical path counter chamber, a photoelectric detection module and a digital phase-locked amplifier. In order to test the performance of the system, acetylene gas samples were equipped and gas detection experiments were carried out. The experimental results show that the minimum detection limit of the system is 0.02 and the second harmonic amplitude has a good linear relationship with the concentration of acetylene in the range of 0.022% volume fraction. The stability of the system was tested by the stability experiment for 20 hours. Since the transmission loss of near infrared band quartz fiber is very small, the gas chamber and the optical path can be separated from the circuit part, thus the remote gas detection can be carried out. This is based on the quantum cascade laser, and the acetylene detection system with thermal light source is difficult to realize. The system adopts distributed feedback laser driver and phase-locked amplifier, which is simple in structure, high in performance and price ratio, and integrated with each other. It has a good prospect of application in the detection of acetylene concentration in industrial field.
【作者单位】：集成光电子学国家重点联合实验室吉林大学实验区吉林大学电子科学与工程学院;材料科学重点实验室中国科学院半导体所;
【基金】：国家科技支撑计划项目(2014BAD08B03,2013BAK06B04) 国家自然科学基金项目(61307124,61077074) 吉林省科技发展计划项目(20120707)资助
【分类号】：TH744.4

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