An original non-contact measurement method using multiple line-structured laser sensors is introduced for seamless steel pipe straightness error is in this paper. An arc appears on the surface of the measured seamless steel pipe against a line-structured laser source. After the image of the arc is accepted by a CCD camera, the coordinates of the center of the pipe cross-section circle containing the arc can be worked out through a certain algorithm. Similarly, multiple line-structured laser sensors are equipped parallel to the pipe. The straightness error of the seamless steel pipe, therefore, can be inferred from the coordinates of multiple cross-section centers obtained from every line-structured laser sernsor.
基金项目：Supported by the National Nature Science Foundation of China under grant No. 59975070.
LIU Yue：State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China Received March 24 2000
LU Rongsheng：State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China Received March 24 2000
YE Shenghua：State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China Received March 24 2000
备注：was bom in 1967. He received Ph. D. degree in Opto-electronic Instrument, from SanktPeterburgPrecision Mechanics and Optics Institute (Russia) in 1994. He is an associate professor at the Department of Precision Instrument Engineering of Tianjin University. His research interests include laser measuring technology and computer vision inspection system.
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