相位式双频激光拍波测距方法研究

项目名称： 相位式双频激光拍波测距方法研究

项目编号： No.61205161

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： 李孟麟

作者单位： 中国科学院光电研究院

项目金额： 28万元

中文摘要： 随着科技的发展，工业生产领域需要更高精度，更快速响应的测距方法。传统的相位式激光测距技术存在着测量精度与测量速率间的矛盾，模糊距离，半导体激光器对高频调制信噪比的制约等问题，而双频激光技术的发展为解决这些技术瓶颈提供了新途径。本研究结合相位式激光测距的原理，探索采用差频可调谐的双频He-Ne激光器产生拍波信号作为光源，实现多频测尺无模糊相位式激光测距的新方法。通过分析影响测量精度的各种因素，构建误差传递模型，研究抑制干扰的相位检测技术，并基于全相位谱分析的鉴相方法，引入希尔伯特变换，消除数据处理过程中的鉴相偏差。为解决高精度、大动态范围的相位式激光测距技术发展中的若干关键问题提供新思路。

中文关键词： 双频激光；相位式；激光测距；光电检测；鉴相方法

英文摘要： With the fast development of technology, high resolution, fast and dynamic distance measurements are needed in more and more fields. The precision of traditional phase-shift range finder is limited by its measurement rate, and the dynamic range is constrained by fuzzy distance. The modulation depth of laser diode decreases with increased modulation frequency, which is essential to obtain high precision by the sinusoidal modulation. This research is focusing on some key technologies of phase-shift laser range finding utilizing the beat-wave of dual-frequency laser and exploring a new method on the base of principle of laser range finding. A dual-frequency He-Ne laser with adjustable frequency difference is going to be applied as the laser source of measurement, and the non-fuzzy measurement technology is going to be developed by multi-frequency difference. A model of error transferring is about to be built in order to analyze the factors influence the precision of phase-shift laser range finder and to minimize the disturbance in procedure of phase metering. In order to reduce the phase discrimination error in phase-shift laser range finder, the Hilbert transform is about to be introduced during the processes before spectrum analysis, it helps to realize unbiased phase difference measurement. It will conduce to le

英文关键词： Dual-frequency laser；Phase-shift；Laser range finder；Photoelectricity detecting；Phase discrimination