Method and device for attitude compensation of magnetic flux leakage detection probe

Abstract

The invention discloses a method and device for attitude compensation of a magnetic flux leakage detection probe, wherein the method includes: obtaining the tangential distance of two three-axis magnetic field measurement chips in a normal posture; using the two three-axis magnetic field measurement chips to obtain the current probe tilt Under the magnetic field value; the two sets of tangential components in the obtained magnetic field value are filtered and differentiated to obtain the differential value of the two sets of magnetic field measurement signals; the characteristics of the differential value are respectively marked to obtain flat data with constant characteristic differential values segment; record the midpoint of the flat data segment as the defect center, and record the first and second mileage distances corresponding to the defect center; calculate the current probe attitude tilt according to the first and second mileage distances and the tangential distance of the two measuring chips angle; use the inclination angle to perform compensation calculation on the obtained magnetic field value, and obtain the magnetic flux leakage signal of the defect under the correct attitude of the probe. The method can complete the measurement of the magnetic flux leakage signal and the real-time compensation of the inclined attitude magnetic flux leakage signal under the condition that the attitude of the probe is inclined.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a method and device for attitude compensation of a magnetic flux leakage detection probe. Background technique [0002] Magnetic flux leakage testing is one of the most commonly used online testing techniques for non-destructive testing of oil and gas pipelines and oil storage tank floors. Magnetic flux leakage detection is mainly through saturation magnetization of the test piece, and detecting the distribution and size of the leakage magnetic field at the defect of the test piece, and then solving the defect size information. However, in the actual detection process, the magnetic flux leakage detection probe will vibrate when it passes through flanges, welds, etc., and the vibration may cause the probe to tilt; during the detection process, there may also be excessive wear on one side of the mechanical shell of the probe. Probe attitude tilt problem. The signa...

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Problems solved by technology

However, in the actual detection process, due to irresistible reasons such as wear and mechanical offset, the attitude of the magnetic flux leakage detection probe may be inclined at any time, and due to the existence of flutter, the degree of inclination of the probe at each defect may be inconsistent , and the above-mentioned mechanical method can only be optimized in most cases, and cannot solve the function of compensating the measurement signal after the tilting phenomenon of the probe attitude

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