摘要
针对甲烷气体浓度实时检测的要求,设计了一型基于谐波检测原理的检测仪器。该仪器由DFB激光器、准直器、角反射器构成高信噪比光路系统,由数字锁相放大器提取甲烷气体吸收后的一次和二次谐波,并采用标准仪器校准、最小二乘拟合等方法,得到了甲烷气体浓度计算公式,最大测量误差不超过1.1%。测试表明:该仪器通过高性能光路系统和数字电路提取微弱信号,提高了仪器工作稳定性和检测信噪比,测量误差满足使用要求。
According to the the requirement of real-time detection of methane gas concentration,a detection instrument based on the principle of harmonic detection was designed.The instrument was composed of a DFB laser,a collimator,and a corner reflector.They are composed of optical system with high signal-to-noise-ratio,the methane absorption of weak one and two harmonics extracted by digital lock-in amplifier,and through the calibration,and the standard instrument of the least squares fitting method,and the calculation formula of the methane concentration,the maximum measurement error was less than 1.1%.The test showed that this instrument can improve the working stability and the signal-to-noise ratio of the instrument through the design of the high performance light path system and the use of digital circuits.The measurement error met the requirements of the instrument.
作者
范丛山
FAN Congshan(Yangzhou Industry Polytechnic Institute,Yangzhou Jiangsu 225127,China)
出处
《电子器件》
CAS
北大核心
2018年第6期1577-1581,共5页
Chinese Journal of Electron Devices
基金
国家自然科学基金项目(61573307)