Camera motion control system of the fatigue crack propagation test based on ARM technology

ZHONG Jian-fei， GAO Hong-li， ZHOU Yin
（Key Laboratory of E & M， Ministry of Education & Zhejiang Province，
Zhejiang University of Technology， Hangzhou 310014， China）

Abstract： It is necessary to track fatigue crack automatically in the fatigue test. Aiming at the automatic tracking of the fatigue crack，firstly， a tilt system of camera was set up by stepping motor for sports organizations，and ARM was used as a stepping motor controller，then the crack image which was acquired by the camera was processed by the PC and translated into motion control signal of stepping motor，finally the control signal was transmitted to ARM through a serial port. The results indicate that the camera's motion control system has the desired control accuracy with the 0.05 mm positioning accuracy and the 0.02 mm repetitive positioning accuracy，the effect of the crack tracking is ideal also.
Key words： serial communication； ARM； crack tracking； stepping motor； motion control