摘要
基于红外光谱吸收型的气体传感器是目前最为有效、应用最广泛的瓦斯浓度测试方案。本文基于红外分子光谱学原理,采用MEMS红外收发组件作为气体敏感部件,首先对红外气体传感器的基本原理进行了分析,得到了探测器红外感光特性与气体浓度变化的关系,采用C8051F040单片机作为控制核心,完成了气体传感器总体方案设计,提出了具有带通放大功能的信号调理电路以实现噪声抑制,有效提高检测信噪比;针对气体传感器的信号检测电路,从硬件层面进行了详细的叙述,主要包括电源管理、驱动控制、CAN总线通信、数据采集处理及控制等功能模块,描述了信号软件设计流程和方法;最后,完成了信号检测电路搭建和传感器样机研制,进行了常温条件下的CH4浓度测试,测试结果表明研制的气体传感器测试数据与之前的分析结果完全一致,具备高精度、微型化、低功耗的技术特点。
The gas sensor based on infrared absorption principle is the most effective,widely used in the test of gas concentration.The paper based on the principle of infrared molecular spectroscopy,the MEMS infrared transceiver module is used as the gas sensitive unit.Firstly,the basic principle of the infrared gas sensor is analyzed,and the relationship between the infrared sensitivity of the detector and the gas concentration is obtained.The C8051 F040 MCU is used as the control core.The overall design of the gas sensor is completed,and a signal processing method features has a band-pass filter is proposed to suppress noise,improve the detection signal-to-noise ratio,effectively.The gas sensor signal detection circuit hardware is described in detail,which includes several functional modules,such as power management,drive control,CAN bus communication,data acquisition,processing,and control.Software design method is described.Finally,the signal detection circuit,as well as the sensor prototype is completed,the CH4 concentration under normal temperature conditions is performed.Tests data show is completely consistent with the previous analysis,the gas sensor has the technical characteristics of high precision,miniaturization and low power consumption.
作者
白书华
雷明
Bai Shuhua;Lei Ming(Nanchang Universily of Technology,Nanchang,Jiangri 330044,China)
出处
《应用激光》
CSCD
北大核心
2020年第2期362-367,共6页
Applied Laser
基金
国家自然科学基金(项目编号:61663033)
江西省科学技术研究项目(项目编号:20181BBG78050)。
