基于谐波分析的NDIR气体检测系统  

NDIR Gas Detection System Based on Harmonics Analysis

作　　者：赵玲[1] 何秀丽[1] 贾建[1] 高晓光[1] 李建平[1] 

机构地区：[1]中国科学院电子学研究所,传感技术国家重点实验室,北京100190

出　　处：《仪表技术与传感器》2014年第2期50-53,共4页Instrument Technique and Sensor

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA04Z328)

摘　　要：针对传统非分光红外（NDIR）气体检测系统智能化程度低和信号分析能力差的问题,采用虚拟仪器技术构建基于快速傅里叶变换谐波分析的新型红外气体检测系统.系统以单板机PCM3353为核心,选用MEMS电调制光源和热释电红外探测器,采用单板机扩展采集卡PM518进行探测器信号采集,在LabVIEW环境中对探测器信号进行滤波降噪和频域分析.SO2气体检测试验表明：相对于传统的数据处理方法,系统信噪比提高了3～5倍,气体检测下限降低为原来的1/4.A non-dispersive infra-red （NDIR） gas detection system with high degree of intelligence and powerful data process- ing capability was developed based on virtual instrument technology and fast fourier transform （FFT） harmonics analysis method. A Single Board Computer （SBC） PCM3353 was used as the system core which extended a data acquisition card PM518 to acquire the signal of detector. The modulated）R source and the pyroelectric infrared detector were used in the system and the high resolu- tion was enabled due to the novel signal processing algorithms realized on, abVIEW. The testing results to SO2 gas indicate that the signal noise ratio of the system was enhanced from 3 to 5 times and the detection limit was reduced to 1/4 comparing with the peak- to-peak data analysis method.

关 键 词：红外气体检测 谐波分析 快速傅里叶变换 朗伯-比尔定律 热释电 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]