摘要
基于CO气体近红外吸收的机理,研究了一种光谱吸收型光纤CO气体传感器。通过光纤光栅和压电陶瓷(PZT)对宽带光源LED进行波长调制,获得窄带反射出射光,检测其二次谐波,实现CO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,给出了CO气体的测量结果。实验表明,该仪器的检测灵敏度可达到0.2×10-6。
A system using absorption type optic fiber for carbon monoxide was demonstrated based on the near infrared spectral absorption of carbon monoxide.The LED was used as a light source,and its wavelength modulation was realized by fiber graing and piezoelectric ceramics(PZT) to abtain narrowband reflection output light.The high sensitivity detection of carbon monoxide can be achieved by the LED 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 was built up.The result of carbon monoxide′s concentration was also shown.Experiment has proved that the measurement sensibility of the sensor is 0.2×10^(-6).
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2004年第4期428-431,共4页
Journal of Optoelectronics·Laser
基金
河北省自然科学基金资助项目(600227)
