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An Automated Inner Dimensional Measurement System Based on a Laser Displacement Sensor for Long-Stepped Pipes
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
* Author to whom correspondence should be addressed.
Received: 12 March 2012; in revised form: 17 April 2012 / Accepted: 25 April 2012 / Published: 4 May 2012
Abstract: A novel measurement prototype based on a mobile vehicle that carries a laser scanning sensor is proposed. The prototype is intended for the automated measurement of the interior 3D geometry of large-diameter long-stepped pipes. The laser displacement sensor, which has a small measurement range, is mounted on an extended arm of known length. It is scanned to improve the measurement accuracy for large-sized pipes. A fixing mechanism based on two sections is designed to ensure that the stepped pipe is concentric with the axis of rotation of the system. Data are acquired in a cylindrical coordinate system and fitted in a circle to determine diameter. Systematic errors covering arm length, tilt, and offset errors are analyzed and calibrated. The proposed system is applied to sample parts and the results are discussed to verify its effectiveness. This technique measures a diameter of 600 mm with an uncertainty of 0.02 mm at a 95% confidence probability. A repeatability test is performed to examine precision, which is 1.1 µm. A laser tracker is used to verify the measurement accuracy of the system, which is evaluated as 9 µm within a diameter of 600 mm.
Keywords: laser displacement sensor; pipe interior geometry; automated measurement; long-stepped pipe
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Cite This Article
MDPI and ACS Style
Zhang, F.; Qu, X.; Ouyang, J. An Automated Inner Dimensional Measurement System Based on a Laser Displacement Sensor for Long-Stepped Pipes. Sensors 2012, 12, 5824-5834.
Zhang F, Qu X, Ouyang J. An Automated Inner Dimensional Measurement System Based on a Laser Displacement Sensor for Long-Stepped Pipes. Sensors. 2012; 12(5):5824-5834.
Zhang, Fumin; Qu, Xinghua; Ouyang, Jianfei. 2012. "An Automated Inner Dimensional Measurement System Based on a Laser Displacement Sensor for Long-Stepped Pipes." Sensors 12, no. 5: 5824-5834.