Omnidirectional imaging-based method and system for detecting inner wall of steel pipe

Abstract

The invention discloses an omnidirectional imaging-based system for detecting the inner wall of a steel pipe. A CCD (Charge Coupled Device) / CMOS (Complementary Metal Oxide Semiconductor) photosensitive assembly is arranged in a camera box in a steel pipe to be detected, a PAL (Progressive Addition Lens) is arranged on the CCD / CMOS photosensitive assembly, LED lamps are respectively arranged on four corners at the outer side of the camera box close to the CCD / CMOS photosensitive assembly, the camera box is internally provided with a rechargeable battery or LED charge circuit board, a drive device with rollers is arranged at the outer side of the camera box far away from the CCD / CMOS photosensitive assembly, a data line of the PAL is connected with an FPGA (Field Programmable Gate Array) of an embedded type omnidirectional video image processing system through a GigE-GB Ethernet port, and a control line of a drive motor is connected with a motor control unit. The drive mechanism drives a camera to enter a deep part of the steel pipe for real-time shooting, and shot images are displayed on a computer and subjected to observation and detection; meanwhile, an embedded type image processing system consisting of a DSP (Digital Signal Processor) and the FPGA operates based on division of labors, thus the invention has the advantages of high image processing speed and good real-time response, and is especially suitable for real-time monitoring.

Description

technical field [0001] The invention relates to a method and system for detecting the inner wall of a steel pipe, in particular to a method and system for detecting the inner wall of a steel pipe based on panoramic imaging technology. Background technique [0002] For seamless steel pipes and nuclear power pipes used in petroleum, natural gas and other industries as transportation pipelines, not only the inner wall of the steel pipe needs to be inspected before leaving the factory to determine whether there are cracks, wrinkles and other defects on the inner wall of the steel pipe, but also during use. , due to the long-term accumulation of mechanical friction and fluid erosion, it may cause grooves on the inner wall of the steel pipe, corrosion holes, etc. If these defects cannot be discovered in time and dealt with immediately, major accidents may be caused, resulting in heavy losses of personnel and property. [0003] There are currently traditional inspection methods fo...

AI Technical Summary

Problems solved by technology

For steel pipes with small diameter, long length or curved shape, it is difficult to ensure the irradiation distance from the external light source, and the distance observed by the inspector is always limited. At the same time, there is a certain danger because the head needs to be close to the steel pipe.

Therefore, the traditional method can no longer guarantee the quality of the inner surface of the steel pipe, and the detection efficiency is low and the reliability is poor.

Nowadays, with the development of photoelectric technology, the detection technology of the inner wall of the steel pipe has developed rapidly, and there has also been equipment for detecting the inner wall of the steel pipe with a camera, such as the utility model patent of 200520031724.2, but its camera is manually pushed into the steel pipe to detect the steel pipe The length depends on the length of the propelling line, it is not suitable for long pipe measurement, and the manual work efficiency is low, and there is no follow-up image processing, so the defect cannot be located, and the inner wall of the steel pipe cannot be completely reproduced, and there is a certain false detection rate.

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