Research on field calibration method of straightness in five-degree-of-freedom measurement

The field calibration of straightness is an important method to ensure the accuracy of on-line measurement. Based on the transceiver integrated laser five-degree-of-freedom measurement structure, the field calibration model was established aiming at the Abbe error, and the imaging error of retroreflector caused by the calibration platform. According to the calibration model and the angle measurement results of the five-degree-of-freedom measuring device, a compensation method of straightness calibration errors was proposed. Experimental results showed that the calibration coefficient error was within 0.2% when using the calibration method, and the calibration errors of straightness were effectively reduced. The calibration method made the error of calibration coefficient reduce to less than 0.2%, and effectively improved the accuracy of straightness field calibration.