SONG Lin-li
(School of Information and Communication Engineering, North University of China, Taiyuan 030051, China)
Abstract： The infrared absorption method for methane concentration detection is an ideal way to detect methane at present. However, it is difficult to spread this method due to its high cost. In this paper, by using a wideband infrared light emitting diode (LED) accompanied with a PIN photo electric diode, a low-cost methane detection system was designed. To overcome the shortcomings caused by the wide working band, a differential light path was designed. By means of a differential ratio algorithm, the stability and the accuracy of the system were guaranteed. Finally, the validity of the system with the proposed algorithm was verified by the experiment results.
Key words： methane detection; infrared absorption; differential light path; differential ratio algorithm
CLD number： TQ22; TP274+.5Document code： A
Article ID： 1674-8042（2015）02-0193-04 doi： 10.3969/j.issn.1674-8042.2015.02.015
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基于差分红外吸收的甲烷浓度检测系统
宋林丽
（中北大学 信息与通信工程学院， 山西 太原 030051）
摘要:红外吸收法是目前甲烷浓度检测的理想手段， 但其成本较高， 难以推广应用。 本文采用宽带红外LED光源并配合PIN光电二极管， 设计了一种低成本的甲烷检测系统。 为了克服因采用宽带光源带来的不足， 设计了一种差分光路， 并采用差分比例算法来保证系统的稳定性和精度。 最后， 通过实验验证了本系统及提出算法的有效性。
关键词:甲烷检测； 红外吸收； 差分光路； 差分比例算法
引用格式：SONG Lin-li. Methane concentration detection system based on differential infrared absorption. Journal of Measurement Science and Instrumentation, 2015, 6(2)： 193-196. ［doi： 10.3969／j.issn.1674-8042.2015.02.015］
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