新型相位式激光测距系统电路的设计

为了提高相位式激光测距系统的精度和可靠性,设计了一种新型的相位式激光测距系统的发射和两路几乎一致的接收电路。通过采用具有微小频差的低抖动时钟发生技术,差频测相技术等原理,系统可以实现特定环境下的高精度测量。系统由级联式PLL可编程时钟信号源、激光发射与接收模块、自动增益控制、混频滤波及数据采集组成。利用时钟源产生调制信号,并对反馈信号和接收信号进行放大、混频滤波等信号调理,进而采集数据并对数据进行处理分析。在电路的设计中,优化了激光的调制发射电路,采用低回波损耗的尾纤式激光器,增加简单实用的自动增益模块等。实验观察的波形和数据结果分析表明,此相位式激光测距系统电路简单实用,并且具有较高的稳定性和较高的测量精度。

Design of new type phase laser ranging system circuit

In order to improve the accuracy and reliability of the phase laser ranging system,a new type of phase laser ranging system which contains two almost identical receiving circuits and the transmission was designed. The system achieves high accurate measurement in some particular environments through the use of low jitter,small frequency difference clock generation technology and phase-shift measurement technology. The system is mainly composed of cascaded PLL programmable modulation signal generating,laser emission and receiving module,the automatic gain control,mixing filtering and data acquisition. Modulated signal is generated by the clock source,and the feedback signal and received signal are amplified,and then the collected data are processed and analyzed. Modulator and transmitter circuits of the system are optimized in the design of circuit. Pigtailed laser with low return loss and simple practical automatic gain module are used. The experimental results show that the phase laser ranging system circuit is simple and practical,and has high stability and high precision.