基于马赫增德尔调制器的相位式激光测距  

Phase-shift Range Finder Based on Mach-Zehnder Modulator

作　　者：刘玉周[1] 朱国力[1] 赵斌[1] 

机构地区：[1]华中科技大学机械科学与工程学院,武汉430074

出　　处：《机械工程学报》2014年第21期99-104,共6页Journal of Mechanical Engineering

基　　金：国家重点基础研究发展计划资助项目(973计划;2007CB714000)

摘　　要：为了提高相位式激光测距的精度,提出以马赫增德尔调制器作为外调制器,提高调制频率以提高测距分辨率。介绍了射频相位式激光测距试验装置的组成,该系统以小数分频锁相环产生1.5 GHz左右正弦调制信号,采用马赫增德尔调制器对光波进行强度调制,并以差分式测量的方法抵消温度引起的相位差漂移,将信号下变频后按相关法计算相位差。试验表明,由光电探测器噪声和电路噪声引起的相位差漂移小于0.15°,该测距装置的测距误差在±0.05 mm以内。In order to improve the performance of laser phase-shift range finder, a Mach-Zehnder modulator is used as external modulator of the range finder, and the modulation frequency is increased to obtain high distance resolution. A phase-shift ranging system is described. In the system, the sinusoidal modulation signals about 1.5 GHz is generated by a fractional-N frequency synthesizer, and the Mach-Zehnder modulator working as an intensity modulator is used. The phase difference drift caused by temperature is eliminated with differential measurement method, and the phase-shift is obtained with a heterodyne technique associated with cross-correlation analysis. The experimental results show that the phase difference drift caused by the photoelectric detector and circuit noise is less than 0.15°, and the distance error of the ranging device is within ±0.05 mm .

关 键 词：马赫增德尔调制器 差分式测量 相位差漂移 相位式测距 

分 类 号：TH741[机械工程—光学工程]