Research for multi-channel wheelset image acquisition trigger system

ZHOU Wei-xiang，WU Kai-hua，CAI Xin，ZHU Xiao-feng

（College of Life Information Science and Instrument Engineering，Hangzhou Dianzi University，Hangzhou 310018，China）

Abstract：The detection of vehicle wheel set wear parameters act an important role in ensuring the safe operation of the vehicle. Aiming at the problem of precise positioning of the vehicle wheel sets in the image acquisition process of dynamic detection，a set of multichannel image acquisition trigger system was designed. Through performance research of the vehicle detecting sensor，detecting signals were optimized and the error introduced by the sensor was reduced；by using multi sensor groups，the detection of different operating speeds of the wheel set was achieved. A trigger controlling circuit board was designed to deal with multi-channel signals；to capture the wheel set image on the position，the shooting time of cameras was adjusted by the control software basing on detecting results，high precision timing function was designed by using the timer module in the microcontroller. Experiments and research results indicate that the multi-channel image acquisition trigger system is stable and the repeatable delay time error is less than 0.001 s. The effect and precision of image acquisition can meet the design requirements.