高精度光离子化传感器的设计  

Design of high precision photoionization detector

作　　者：王晋 郝现伟 董钧港 熊继军[1] 洪应平[1] Wang Jin;Hao Xianwei;Dong Jungang;Xiong Jijun;Hong Yingping(Key Laboratory of Instrumentation Science and Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100171,China;Beijing Capital Aerospace Machinery Co.,Ltd.Beijing 100076,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]北京宇航系统工程研究所,北京100171 [3]北京首都航天机械有限公司,北京100076

出　　处：《红外与激光工程》2020年第8期240-247,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金青年科学基金(51705475)。

摘　　要：针对当前国产光离子气体传感器因精度较小、成本较高而一直无法广泛应用的技术难点问题,提出了一种通过改进结构将射频紫外灯驱动模块和微弱电流检测模块分离的方法。基于光离子化和抗电磁干扰的机理,深入探讨了传感机制和减弱噪声的方法,设计研制电源模块、紫外灯驱动模块和微弱电流检测模块等解调电路模块。设计特殊的外壳结构,使之在屏蔽外界干扰的同时,也降低了高压交流电给微弱电流检测模块带来的噪声干扰,进而提高了传感器的测试精度。构建了整体传感器的测试与标定系统。理论与实验结果表明:该传感器线性度良好,重复性为1.8%,在室温下工作稳定,可以应用到环境测量中。同时,所设计的传感器因其体积小、灵敏度高和响应快等优点,为其使用的便捷性和测量的实时性提供了可靠的解决方案。Aiming at the difficult technical problem that the current domestic photoionization detectors are not able to be widely used due to its low accuracy and high cost,a method to separate the radio frequency UV lamp driver module and the weak current detection module was proposed by the improved structure.Based on the principle of photoionization and anti-electromagnetic interference,the detector mechanism and the method of reducing noise were discussed in depth,and the demodulation circuit modules such as power module,UV lamp driving module and weak current detection module were designed and developed.Special shell structure was designed to reduce noise interference caused by high voltage alternating current to weak current detection module while shielding external interference,so as to improve the measurement accuracy of the detector.A test and calibration system for the overall detector was constructed.The theoretical and experimental results show that the detector has good linearity,good repeatability(1.8%),stable operation at room temperature,and can be applied to the real environment.Meanwhile,the detector of this design has the advantages of small size,high sensitivity and fast response.It provides a reliable solution for the ease of use and real-time measurement.

关 键 词：光离子化 解调电路 电磁干扰 降噪 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]