（四川大学测试技术与控制工程系,四川 成都 610065)

摘  要：高频相位测量装置是激光轮廓测量仪不可缺少的一部分，它完成的工作是对两路被测信号进行相位测量。文中介绍了一种用混频原理和锁相环技术将高频转化为低频，并且用相关计数法对低频相位进行测量的方法。低频部分主要是利用了单片机丰富的软硬件资源和CPLD器件灵活多用功能来实现的。通过混频电路和低频相位测量电路的组合，能较高精度地完成此相位测量任务。

关键词：混频原理；锁相环技术；单片机；CPLD；相关计数

中图分类号：TM933.3+12， TN249        文献标识码：A      

 文章编号：1672-4984（2008）01-0022-03

Measuring circuit design for high-frequency phase of laser profilometer

OU Wen-chu， XIE Chi

（Department of Testing Technology and Control Engineering，Sichuan University，Chengdu 610065，China）

Abstract: High-frequency phase measuring equipment is an indispensable part of the laser profilometer. Its work is to measure the phases of two measured signals. One measurement method using designed circuit to change high-frequency into low-frequency with the frequency mixing theory and phase locking technique, then using correlative counting method to measure low-frequency was introduced. The low-frequency part mainly used the ample resource of SCM and flexible functions of CPLD. With combination of frequency mixing circuit and low-frequency measurement circuit, the designed circuit can measure the phase more accurately.

Key words: Frequency mixing theory; Phase locking technique; SCM(single-chip computer); CPLD; Correlative counting method

Editor：liyan