摘要
基于气体的近红外吸收机理,研究了一种可以检测多种气体的全光纤传感方法,采用光纤光栅波分复用技术,通过光纤光栅和压电陶瓷(PZT)对宽带光源LED进行波长调制,获得与相应气体吸收峰相对应的窄带反射出射光,检测二次谐波,实现对多种气体的较高灵敏度测量。利用二次谐波与光纤光栅透射光强的比值来消除光路干扰。建立了谐波检测的数学模型,进行了光纤C2H2和CO气体测量系统的实验研究。
Based on the near infrared spectral absorption of gases, an optical fiber gas sensor for multi- gas detection is described. Wave division multiplex technology of fiber gating is used and the LED is used as a light source and wavelength modulation is realized by the modulating on fiber grating and piezoelectric ceramics（PZT）to abtain narrowband reflection output light, the high sensitivity detection of gases can be achieved from the second harmonic signal. The ratio of the transmission signal and second - harmonic signal can be used for eliminating optical interference. The mathematical model of gas concentration harmonic measurement is built up. The experiments of acetylene and carbon monoxide detection system are studied.
出处
《仪表技术与传感器》
CSCD
北大核心
2006年第2期29-32,共4页
Instrument Technique and Sensor
关键词
近红外吸收
光纤传感
光纤光栅
渡分复用
谐波检测
near infrared spectral absorption
optical fiber sensor
fiber grating
wave division multiplex
harmonic measurement
