基于TMS320F2812的航空相机自动调焦系统

Autofocus System for Aerial Cameras Based on TMS320F2812

为了保证航空相机成像清晰,需要进行自动调焦。本文采用TMS320F2812作为主控芯片,自动调焦系统包括位置反馈编码器、步进电机、步进电机驱动电路、温度传感器、气压传感器等模块。经分析,系统的最大理论误差为0.017mm,实测系统的误差为0.015mm,满足了相机对自动调焦系统的指标要求。

The autofocus system was designed to achieve both stable and clear images in aerial cameras. The system design has taken TMS320F2812asthe core chip of control system and the modules of serial communication interface, step motor, step motor driver, digital thermometer and digital pressuresensor included. Experimental results show that the maximum theoretical error of the autofocus system is 0.017 mmwith 0.015 mm for actual maximumerror .This data of focusing error can satisfy requirement for focusing system in aerial cameras.