Structural dimension measurement and error analysis of power cable based on image computing

Structural dimension measurement of power cables is a key test item to check the quality of cable products. The traditional cable structure dimension measurement method using proj ector has some shortcomings, such as time-consuming, low precision and poor repeatability, strong dependence on personnel experience and so on. Therefore, a cable structure dimension measurement method based on image computing has been studied and the measurement system based on this method has been also established. The precision of the measurement system are verified by the annular standard instrument measurement experiment. The structure dimension measurement and error analysis of the cable sample are carried out. The experimental data of annular standard instrument measurement shows that the maximum absolute deviation of outer diameter parameters is 0.042mm, and that of thickness parameters is 0.008mm. The measured data of cable sample structure dimension shows that the limit errors of out diameter parameters are less than 0.1 mm, and that of thickness parameters are less than 0.01mm. The measurement accuracy of the out diameter and thickness parameters of this measurement system based on the method can meet the measurement requirements, which provides a new idea for the automatic measurement of power cable structure dimension.