• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (21): 99-104.doi: 10.3901/JME.2014.21.099

• 论文 • 上一篇    下一篇

基于马赫增德尔调制器的相位式激光测距

刘玉周;朱国力;赵斌   

  1. 华中科技大学机械科学与工程学院
  • 出版日期:2014-11-05 发布日期:2014-11-05

Phase-shift Range Finder Based on Mach-Zehnder Modulator

LIU Yuzhou;ZHU Guoli;ZHAO Bin   

  • Online:2014-11-05 Published:2014-11-05

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。

关键词: 差分式测量, 马赫增德尔调制器, 相位差漂移, 相位式测距, 并联机构, 传感器, 解析算法, 运动学正解

Abstract: 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 .

Key words: differential measurement, Mach-Zehnder modulator, phase difference drift, phase-shift range finding, Analytical algorithm, Forward kinematics analysis, Parallel mechanisms, Sensor

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