Eddy current heating type pipeline defect infrared imaging testing device and test method

Abstract

An eddy current heating type pipeline defect infrared imaging testing device and a test method belong to the field of nondestructive testing. The device is composed of an induction heating unit, an image acquisition unit and an image processing unit. A measured buried pipeline undergoes non-contact local micro-heating by the utilization of an eddy current heating probe of the induction heating unit, the buried pipeline will generate eddy current to heat pipe wall and radiate outwards infrared rays. Under the assistance of an infrared laser pointer, an infrared thermal imager is directed at the measured pipeline to carry out image acquisition. Information of the acquired images is transmitted to a computer through an image transmission interface. After the image information is processed by the computer, whether the measured pipeline has defects and defect shape and actual size are calibrated. The invention is funded by the program of National Natural Science Foundation of China (51365019). The testing device can be cooperatively used along with a pipeline detection robot and is used for real-time online detection of steel structural buried pipelines.

Description

technical field [0001] The invention relates to a non-destructive detection system for pipe walls with infrared thermal imaging technology, in particular to a non-destructive detection system for internal defects of pipes that can be used in conjunction with a pipe detection robot and adopts non-contact active local micro-heating infrared imaging technology, and belongs to the field of non-destructive detection. Background technique [0002] Most of the buried pipelines transporting oil and gas medium are steel structure pipelines, which may cause medium leakage accidents due to corrosion, aging or damage. Therefore, during the operation of buried oil and gas pipelines, in addition to regular inspections based on manual experience, real-time online Inspection to timely locate and repair the dangerous areas where the pipeline has leaked or may leak, so as to ensure the safe operation of buried pipelines. Due to the particularity of buried pipelines, at present, the technical ...

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Problems solved by technology

[0005] The first purpose of the present invention is to provide a structure for the deficiencies of the existing pipeline internal defect detection technology, such as the magnetization of the pipeline, the need for couplant to transmit the ultrasonic energy emitted by the piezoelectric probe to the surface of the pipeline to be tested, etc. Simple, low cost, easy to use, a pipeline defect detection device designed according to the characteristics of pipeline defect detection requirements using the principle of infrared thermal imaging

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