摘要
介绍了国内常用的甲烷传感器及其优缺点,在此基础上设计了一种基于非分光红外法（NDIR）原理的甲烷气体传感器。针对红外探测器输出的特性设计了微弱信号放大电路,使用AD8552对红外热探测器输出的微弱信号进行放大,AD7190对滤波放大后的信号进行采样转换,采用软硬件相结合的方法来减少噪声干扰的影响。通过对不同浓度范围的标准甲烷气体进行实验测量,拟合得到探测器输出的电压差值之比和气体浓度之间的关系。根据得到的曲线和数据分析选择分段插值的浓度计算方法,实现了对甲烷气体进行实时测量的功能。给出该传感器在甲烷体积分数为0%～5.05%的测量结果。
Commonly used domestic methane sensor and its advantages and disadvantages it is introduced. On this basis,design a methane sensor based on principle of non-dispersive infrared（ NDIR）. The sensor designs weak signal amplification circuit aiming at characteristics of infrared detector output. The output signal of infrared detector is amplified by AD8552; the signal of filtered and amplified is sampled conversion by AD7190,in order to reduce the influence of noise,a combination of hardware and software is used,in addition,through experimental measurements of standard methane gas at range of different concentration,fit and obtain relationship between gas concentration and ratio of voltage difference of detector output,according to the obtained curve and data analysis,selects concentration calculation method of piecewise interpolation. and then realize the methane real-time measurement. Finally,measurement results of methane at 0 %～ 5. 05 % are given.
出处
《传感器与微系统》
CSCD
2016年第12期75-78,共4页
Transducer and Microsystem Technologies
关键词
非分光红外
甲烷
传感器
分段插值
non-dispersive infrared（NDIR）
methane
sensor
piecewise interpolation
