摘要
通过调研和分析得出国内非分光红外探硫传感器存在的工艺、检测精度和稳定度问题。文中从气室工艺、光源调制方式与稳定度、设计精密的微弱信号处理电路和恒温控制系统等影响检测结果的因素出发,依次进行改进设计和实验测试,完成气室抛光管的镀金与打磨;并对光源的电调制频率进行反复测试和验证,设计完成一种具有良好平坦特性的微弱信号处理电路。在控温精度为0.1℃的恒温系统中进行实践测试,测试结果表明,所设计的探硫传感器信号的噪声下降约73.7%,检出限达到0.01 ppm,在现有水平的基础上提升近500倍,能够实现低硫的高精密测量,为后续低硫探测的非分光红外传感器研制提供了思路和借鉴。
The problems of technology,detection accuracy and stability of the nondispersive infrared(NDIR)sulfur detection sensors existing in China are obtained by investigation and analysis.In order to deal with the factors such as gas chamber process and light source modulation mode which may affect the test results such as stability and design precision of weak signal processing circuit and constant temperature control system,the design and experimental test of the sensor are improved to complete the gold plating and polishing of gas chamber polishing tube.The repeatedly testing and verification of the electrical modulation frequency of the light source are conducted,and a weak signal processing circuit with good flatness characteristics is designed.The practical test was carried out in the thermostatic system with a temperature control accuracy of 0.1℃.The testing results show that the signal noise of the designed sulfur detection sensor is decreased by about 73.7%,and the detection limit can reach 0.01 ppm,which is nearly 500 times higher than the current level.This can achieve high⁃precision measurement of low sulfur and provide ideas and reference for the development of NDIR sensor for low sulfur detection in the future.
作者
魏丽君
粟慧龙
WEI Lijun;SU Huilong(Hunan Railway Professional Technology College,Zhuzhou 412001,China)
出处
《现代电子技术》
2023年第10期31-36,共6页
Modern Electronics Technique
基金
湖南省自然科学基金项目(2022JJ60008)。
关键词
探硫传感器
非分光红外技术
恒温控制系统
微弱信号处理
校准方法
检出限
sulfur detection sensor
NDIR technology
constant temperature control system
weak signal processing
calibration method
detection limit
