气门弹簧自由高度的间接测量方法

INDIRECT CAPACITIVE MEASURING METHOD FOR VALVE SPRING RANDOM LENGTH

气门弹簧自由高度的间接自动检测是国内气门弹簧生产行业急待解决的一个难题．本文对电容式间接测量检测方法进行了研究，就其电容传感器容值进行了理论推导和计算，并给出了近似的计算公式及其引起的误差，计算值和实测值都充分表明采用此方法有效的满足了这一检测的需要．

The Indirect automatic testing of the valve spring random length is a difficult problem that should be solved urgently in our valve spring production.The principle of the indirect capacitive measurement is described,the capacitive value and the simplified formula are also provided.The system has been calibrated and verified and the result satisfies the requirements.