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中国科学院环境光学与技术重点实验室,安徽光学精密机械研究所,安徽合肥230031摘要乙炔作为有机化工产品原料,广泛应用于化学工业中,但易燃易爆,在储存和工业生产中有必要对其进行实时在线监测。可调谐半导体激光吸收光谱(TDLAS)技术具有高选择性、高灵敏、快速响应等特点,在痕量气体检测中得到了广泛的应用。文章研究了乙炔气体在近红外波段的吸收线分布特征,详细地讨论了基于近红外可调谐二极管激光吸收光谱技术的乙炔在线监测系统设计方案;建立了实验测量系统,研究了信号检测方法和浓度反演算法,对长度10cm的样品池和已知标准浓度乙炔气体配制的不同浓度乙炔气体进行检测,检测限可以达到1.46cm3.m-3;进行了动态检测实验,测量结果具有较好的稳定性和可靠性。分析表明系统设计方案可行,由此发展的乙炔在线监测系统可用于乙炔储存、运输和使用过程中泄漏报警。
Key Laboratory of Environmental Optics and Technology, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Hefei 230031, China Abstract As an organic chemical raw material, acetylene is widely used in chemical industry, but flammable and explosive. It is necessary for storage and industrial production Its real-time online monitoring. Tunable semiconductor laser absorption spectroscopy (TDLAS) technology has the characteristics of high selectivity, high sensitivity and rapid response, and has been widely used in trace gas detection. In this paper, the absorption line distribution characteristics of acetylene gas in the near infrared wave band are studied. The design scheme of on-line monitoring system of acetylene based on near infrared tunable diode laser absorption spectroscopy is discussed in detail. The experimental measurement system is established and the signal detection method and concentration Inversion algorithm, the length of 10cm of the sample pool and the known concentration of acetylene gas acetylene gas concentration of different concentrations of detection, detection limit can reach 1.46cm3.m-3; carried out dynamic detection experiments, the measurement results have better stability Sexuality and reliability. The analysis shows that the system design is feasible. The developed on-line monitoring system of acetylene can be used for alarm of leakage, storage and transportation of acetylene.