分时差分式光纤甲烷气体检测仪的研制

王英华3  李灵风4
3．新疆特变电工股份有限公司，新疆昌吉  831100；4．燕山大学**教育学院， 河北秦皇岛  066004

基于甲烷气体的吸收光谱特性，研制了一种用低廉LED作光源的新型分时差分式光纤甲烷气体检测仪。光源LED自动实行交替斩波，波长切换机构的灵巧设计可以用单光路实现差分吸收浓度检测，消除了双光路的差异。理论和实验表明，该结构既可以简化设计，又可有效抑制信号检测与传输中的同性干扰。  
Study on Time-Sharing Difference Absorption Optical Fiber CH4 Sensor
Mi Xinjiang1, Xu Aidong2, Wang Yinghua3，Li Ling feng4
(1．Langfang Teachers College,Langfang Hebei 065000，China；
2．Hebei Semiconductor Research Institute,Shijiazhuang Hebei 050051,China ；
3．XinJiang Tebian Electric Apparatus Stock Co.Ltd., Changji Xinjiang 8311 00，China；
4．College of Sequel Education，Yanshan University，Qinhuangdao，066004,C hina)
Abstract:Based on the CH4 absorption spectrum, a novel kin d of transmissiontyp e optical fiber CH4 detector with the lowcost illuminant of LED (automatical ly alternate chopped) is presented in this paper. Timesharing difference absorption signal is realized by a smart design. The theory and experiments show that the sensor with optical fiber is simple for design, sufficient to suppress the inte rference and the variant from the double beam path.
Keywords:Optical Fiber；CH4；TimeSharing Processing Differen ce Photo-Absorption；Sensors