The research and development of the non-contact detection of the tubing internal thread with a line structured light

Yuanyuan Hu; Yingying Xu; Qun Hao; Yao Hu

doi:10.1117/12.2036965

19 December 2013 The research and development of the non-contact detection of the tubing internal thread with a line structured light

Yuanyuan Hu, Yingying Xu, Qun Hao, Yao Hu

Author Affiliations +

Proceedings Volume 9046, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 904611 (2013) https://doi.org/10.1117/12.2036965
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

The tubing internal thread plays an irreplaceable role in the petroleum equipment. The unqualified tubing can directly lead to leakage, slippage and bring huge losses for oil industry. For the purpose of improving efficiency and precision of tubing internal thread detection, we develop a new non-contact tubing internal thread measurement system based on the laser triangulation principle. Firstly, considering that the tubing thread had a small diameter and relatively smooth surface, we built a set of optical system with a line structured light to irradiate the internal thread surface and obtain an image which contains the internal thread profile information through photoelectric sensor. Secondly, image processing techniques were used to do the edge detection of the internal thread from the obtained image. One key method was the sub-pixel technique which greatly improved the detection accuracy under the same hardware conditions. Finally, we restored the real internal thread contour information on the basis of laser triangulation method and calculated tubing thread parameters such as the pitch, taper and tooth type angle. In this system, the profile of several thread teeth can be obtained at the same time. Compared with other existing scanning methods using point light and stepper motor, this system greatly improves the detection efficiency. Experiment results indicate that this system can achieve the high precision and non-contact measurement of the tubing internal thread.

Citation Download Citation

Yuanyuan Hu, Yingying Xu, Qun Hao, and Yao Hu "The research and development of the non-contact detection of the tubing internal thread with a line structured light", Proc. SPIE 9046, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 904611 (19 December 2013); https://doi.org/10.1117/12.2036965

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