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本文介绍了一种实用化的大型工件外径测量方法．用准直激光分别瞄准吸附于工件两端的磁性定位块，由四家限光电池接收判断。轻质粗糙导轨造成误差由ＣＣＤ器件探测并加以补偿，用激光干涉仪完成测长．
This article describes a practical large diameter measurement of the workpiece. Aiming laser with a collimation of the workpiece at both ends of the magnetic positioning block, by four limited light battery to receive judgment. The error caused by the light rough guideway is detected by the CCD device and compensated. The laser interferometer is used to measure the length.