An Improved Harmonic Detection Optical Fiber Gas Sensor

摘要：

Principle of absorption spectrum optical fiber gas sensor was introduced. Mathematical model of optical fiber gas sensor based on difference-harmonic detection was presented and analyzed, and structure of the sensor was designed. Using the difference between referenced light intensity to metrical light intensity, we can counteract the fundamental wave component. Detecting 2nd harmonic of difference signal, we can obtain the gas concentration. By using this method, systems ability of detecting 2nd harmonic component is enhanced, and systems resolving power is increased too. Experimental results show that optical fiber gas sensor based on difference and harmonic detection has good detection effects.

关键词： difference-harmonic detection absorption spectrum optical fiber gas sensor Quadrature Lock-in Amplifier

作者: Jiming Sa Zude Zhou Gang Zhang Youping Chen

作者单位: School of Information Engineering Wuhan University of Technology Wuhan 430070,China School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430

会议类型: 国际会议

会议名称: 2009 IEEE International Conference on Information and Automation(2009年 IEEE信息与自动化国际学术会议)

会议地点: 珠海、澳门

会议语种:英文

页码: 1120-1123

在线出版日期: 2009-06-22（万方平台首次上网日期，不代表论文的发表时间）