甲烷气体检测系统的设计  

Design of methane gas detecting system

作　　者：王玉田[1] 王聪[1] 刘学才[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《传感器与微系统》2007年第10期78-80,共3页Transducer and Microsystem Technologies

基　　金：河北省自然科学基金资助项目(600227)

摘　　要：甲烷是易燃易爆气体，是重要的工业原料和日常生活的燃气，同时也是温室效应最主要的气体之一，快速、实时检测甲烷的产生和泄漏及其体积分数具有十分重要的意义。将吸收式光纤传感技术、差分检测技术及计算机数据处理技术相结合，设计了时间双光路差分气体在线检测系统，可对气体体积分数进行实时在线连续检测。灵巧的波长切换机构，用低廉的LED作光源的时间双光路差分检测系统就可以实现甲烷气体的差分体积分数测量。以具有强大软件开发能力的Visual C＋＋6．0为工具，基于用户界面设计出该监测系统的实时动态监控软件，实现了气体的实时在线检测。本系统的测量范围为0-25％，分辨力为50×10^-6．并日测量灵钎序可调．员小灵敏席为142．35×10^-6．Methane gas is a kind of flammable and explosive gas, an important industry material and daily life gas,and a main gas that engenders greenhouse domino offect, therefore, the quick and real time detection of methane and volume fraction is very important. With the combination of optical fiber sensing technology and difference detecting technology and computer data processing technology, the novel volume fraction online detecting system which employs time-sharing processing difference technology is designed, it can detect volume fraction real- time and continuously. Time-sharing processing difference photo-absorption technology is employed. Alternative chopping is automatically realized by illuminant driver,difference measurement on methane with the low-cost light emitting diode as the light source is completed. Taking the powerful software Visual C ＋ ＋ 6.0 as tool, the real time online dynamic monitor software is designed based on user interface. The measurement range is 0 -25 % , the resolution is 50 ×10^-6,the minimum sensitivity is 142.35×10^-6.

关 键 词：光纤传感 差分检测 在线监测 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]