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Single-lens multi-mirror laser stereo vision-based system for measuring internal thread geometrical parameters.
Optics Express
|December 23, 2022
Summary
A new laser stereo vision system accurately measures oilfield pipe internal threads. This high-efficiency method overcomes limitations of existing techniques, ensuring critical geometric parameter accuracy for preventing failures.
Area of Science:
- Mechanical Engineering
- Optical Metrology
- Petroleum Engineering
Background:
- Oilfield pipe failures can result from internal threads with out-of-tolerance geometric parameters.
- Existing measurement methods suffer from low efficiency, poor accuracy, wear, and accessibility issues.
- Accurate measurement of internal thread parameters is crucial for ensuring the integrity of oilfield pipes.
Purpose of the Study:
- To propose a novel single-lens multi-mirror laser stereo vision system for measuring internal thread geometric parameters.
- To address the limitations of existing measurement techniques in terms of efficiency, accuracy, and accessibility.
- To enable the complete reproduction of three-dimensional (3D) tooth profiles for comprehensive analysis.
Main Methods:
- Development of an explicit 3D optical path model without a reflecting prism to overcome dimensional and structural parameter limitations.
- Introduction of a calculation model for prism size and imaging parameters, considering prism intervention for enhanced accuracy and accessibility.
- Reconstruction of 3D tooth profiles and calculation of geometric parameters (pitch, taper, tooth height) based on American Petroleum Institute standards.
Main Results:
- The proposed vision system achieved average measurement errors of 0.0051 mm for pitch, 0.6055 mm/m for taper, and 0.0071 mm for tooth height.
- Measurement of three critical parameters was accomplished in a single setup with a rapid vision measurement time of 0.5 seconds.
- The system successfully measured internal thread geometric parameters for two types of oilfield pipes, validated by accuracy verification.
Conclusions:
- The single-lens multi-mirror laser stereo vision system offers a highly accurate and efficient solution for measuring oilfield pipe internal thread geometric parameters.
- The developed optical path and calculation models provide a theoretical basis for system design, improving upon experience-based methods.
- This advanced vision system effectively addresses the shortcomings of traditional measurement techniques, enhancing oilfield pipe reliability and safety.
