Design of Automatic Program Control Gain Circuit for Infrared Gas Detection

4th Annual International Workshop on Materials Science and Engineering

Fan, Boqiang^1,2 ; Zhang, Yujun^1 ; Zhang, Kai^1,2 ; Tang, Qixing^1,2 ; Yu, Dongqi^1,2

Key Laboratory of Environment Optics and Technology, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, CAS, Hefei, Anhui

230031, China^1

University of Science and Technology of China, Hefei, Anhui

230026, China^2

关键词: A/D converter;    Automatic programs;    Circuit systems;    Effective resolutions;    Gas concentration;    Gas detection systems;    Photoelectric signals;    Wide dynamic range;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012181/pdf
DOI  :  10.1088/1757-899X/381/1/012181

来源: IOP

【 摘 要 】

When using infrared gas detection technology to measure gas concentration, due to the immobilization of parameters such as cell, detector and light source, the range of the detection gas concentration is limited. In order to achieve the wide range of infrared gas detection system, an automatic program-controlled gain circuit system is designed based on MCP42010. Through the MCU to determine whether the current photoelectric signal is saturated, the resistance of the programmable potentiometer is automatically changed to achieve wide dynamic range detection. The simulation results show that the auto-programmed gain module's amplified photoelectric signal is within the effective resolution range of the A/D converter and meets the actual requirements of infrared gas detection.