基于共轭干涉的光学气体传感理论与方法的研究

项目名称： 基于共轭干涉的光学气体传感理论与方法的研究

项目编号： No.61205072

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 李政颖

作者单位： 武汉理工大学

项目金额： 25万元

中文摘要： 光谱吸收用于气体检测，选择性好，精度高，可重复使用，本质安全无污染，近年来得到迅猛发展。保证光源光谱和传感气体吸收谱的匹配是其中一项关键技术，也是制约光谱吸收法进一步发展的瓶颈。本项目提出研究气体共轭干涉式滤波的原理与器件，通过双通道反相共轭干涉，对应气体吸收谱的光能透过滤波器，其它波长的光则被反射回去，最终获得与气体吸收谱线反转的梳状光谱。该滤波器能有效提高窄带光谱吸收法的检测灵敏度。基于非色散红外吸收原理，该滤波器还有望实现高信噪比高灵敏度的中红外气体检测技术。本项目还将结合气体共轭干涉与环形腔激光器技术，探索形成气体参考稳频激光器的技术与方法，该激光器无需复杂的反馈控制即能保证输出光频率锁定在气体吸收峰，同时根据该激光器特性，研究相应的新型气体传感方法和信号处理方法。项目提出的基于共轭干涉的光学气体传感新原理与新方法，将弥补现有气体传感技术的不足，为气体传感提供新的研究思路和方法。

中文关键词： 气体传感；气体共轭干涉式滤波器；气体参考稳频激光器；中红外；

英文摘要： The technology of spectrum absorption, when it is used in gas measurement, has the excellent selectivity, high precision, reproducibility, intrinsically safe and non-polluting characters, which has developed rapidly. The match of light spectrum and sensing gas absorption spectrum is one of key technology, also is the bottleneck of spectrum absorption development. This project researches the principle and devices of gas conjugate interference filtering. The light wavelength consistent with gas absorption spectrum can pass through the filter due to double-channel reversed-phase conjugate interference, and the other wavelengths are reflected back. Ultimately, the comb spectrum reversal with gas absorption spectrum can be obtained. This filter can improve the sensitivity of narrow band spectrum absorption. Furthermore, this filter expected to achieve mid-infrared gas measurement technology with high signal to noise ratio and high sensitivity based on non-dispersive lnfrared absorption theory. The project will also combine gas conjugate interfere with the ring cavity laser technology; explore the techniques and methods that form the gas reference frequency stabilized laser. The lasers is able to ensure that the output light frequency is locked in the gas absorption peak without complex feedback control, at the same t

英文关键词： Gas sensing；Gas conjugate interference filtering；Gas referenced frequency stabilizing laser；Mid-infrared；