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The research object of this paper is high-precision 3D structure measurement of thin pipe workpiece with working temperature ranged from -50 °C to +70 °C and pipe diameter range from 20 mm to 100 mm. Measurement method is based on the principle of circular structure light vision detection. Due to the strict temperature environment requirement and limited measurement space of the inner surface of pipeline. A CMOS camera module based on customized optical lens is designed. Matched with camera temperature compensation device. Motion guide rail of telescopic arm is equipped with high precision servo motor and grating ruler are used for accurate measurement. Experimental results show that the measurement system meets the design requirements of accuracy ⩽ 0.02 mm, repeatability ⩽ 5% FS (0.5 mm), and strain test error ⩽ 5%.

High precision 3D measurement method of pipeline on complex working conditions research