Abstract:

The structure,characteristics and operational principle of PSD are introduced in this paper.A micro-displacement measurement system based on PSD with high precision is designed.Aiming at the characteristics of PSD signal output and requirements of practical application,a system is designed based on the PSD signal acquisition,processing and transmission to PC.MCU collects signal output by PSD via ADS7864 and transmits the processed data to the host computer via the RS232 interface.The displacement value is displayed on the PC interface,which realizes real-time measurement of light spot's micro-displacement.Experimental results show that the system has quick response and high accuracy,and can be widely used in micro-displacement measurement.

Key words: PSD;micro displacement;ADS7864;bilinear interpolation