影像测量仪快速标定方法

The fast calibration method for image measuring instrument

为满足汽车生产线上大量使用的光滑规的定期检测需求,需要找到一种提高影像测量仪现场测量精度的快速标定方法。通过对影像测量仪标定方法进行分析,提出了影像测量仪标定要利于消除光滑规表面质量和仪器误差对测量结果影响的观点。在此基础上,提出了基于光栅的影像测量仪快速标定方法。该方法直接利用待测光滑规作为标定物,克服了光滑规表面质量对测量结果影响的缺点。在介绍这种方法的标定原理基础上,归纳了该方法的优点,并对其进行了误差分析,误差分析结果说明这种标定方法可以达到使用要求。按这种标定方法对两种不同精度的影像测量仪进行标定,并分别对?6~?40mm之间4种光滑规实测,经过对各组测量数据的方差对比表明,采用光栅和待测光滑规进行标定能获得更稳定的测量结果。

In order to meet the needs of the regular t of plug gauge on the automobile production line, the fast calibra- tion method is needed to improve the measurement accuracy of the image measuring instrument. Through the analysis of the cali- bration method of the image measuring instrument, the viewpoint of the image measuring instrument calibration is proposed to e- liminate the influence of the surface quality of the workpiece and the error of the instrument. For this purpose, a fast calibration method based on optical grating is proposed. The method apply plug gauge that be measured as a calibration object directly, which can overcome the shortcomings of the surface quality of the workpiece to the measurement results. On the basis of introdu- cing the principle of this method, the advantages of this method are summarized and the error analysis is carried out. The result shows that the calibration method can meet the requirements. Applied this calibration method to calibrate the two different preci- sion of image measuring instrument, and measure four kinds of plug gauge the diameter betweenφ6- φ40mm with the two instru- ment separately, by comparing the variance of the measured data, indicating that more stable measurement result can obtained by using the optical grating and the plug gauge calibration.