基于光声光谱的乙烯探测技术

发布时间：2018-07-11 17:31

本文选题：光谱学 + 光声光谱　；参考：《中国激光》2017年05期

【摘要】：乙烯(C2H4)是石油化工产业中的基本化工原料,具有爆炸性,也常被作为煤层自燃的标识性气体。为实现对低浓度乙烯的检测,搭建了基于近红外可调谐二极管激光器的低成本光声光谱测量系统。通过对乙烯近红外波段吸收谱线的分析,选择了乙烯位于1620.44nm处的吸收谱线作为测量对象,并结合波长调制吸收技术,使用光声池的共振频率作为激光器的调制频率,利用吸收谱线的二次谐波信号实现了对乙烯浓度的反演。实验结果表明系统对于乙烯的测量准确度为0.688%,探测极限达到了1.16×10-5,对同一样品在30min之内的连续测量验证了系统良好的稳定性,所有实验结果均显示了该套系统在乙烯痕量探测方面的应用价值。
[Abstract]:Ethylene (C _ 2H _ 4) is the basic chemical raw material in petrochemical industry, which is explosive and often used as the marking gas of coal seam spontaneous combustion. In order to detect low concentration of ethylene, a low cost photoacoustic spectrum measurement system based on near infrared tunable diode laser was built. Based on the analysis of the absorption line of ethylene in near infrared band, the absorption line of ethylene located at 1620.44nm is selected as the object of measurement. The resonance frequency of the photoacoustic cell is used as the modulation frequency of the laser combined with the wavelength modulation absorption technique, and the resonance frequency of the photoacoustic cell is used as the modulation frequency of the laser. The second harmonic signal of absorption line is used to realize the inversion of ethylene concentration. The experimental results show that the measuring accuracy of the system for ethylene is 0.688 and the detection limit is 1.16 脳 10 ~ (-5). The stability of the system is verified by continuous measurement of the same sample within 30min. All the experimental results show the application value of the system in trace detection of ethylene.
【作者单位】：江苏师范大学物理与电子工程学院江苏省先进激光材料与器件重点实验室;
【基金】：国家自然科学基金(61475068,11104237) 江苏省高校自然科学研究面上项目(15KJB140002) 徐州市推动科技创新专项资金项目(KC16SG257,KC16H0231) 国家级大学生创新创业训练计划项目(201510320014)
【分类号】：O433;TQ221.211

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