Remote field eddy current based metal pipeline defect detection device

Abstract

The invention relates to a remote field eddy current based metal pipeline defect detection device. The device comprises a computer, an STM32 development board, a power amplifier, a first exciting coil, a second exciting coil, a first detecting coil, a second detecting coil, a driving rod, a stepping motor and a shielding plate; the computer controls the STM32 development board to generate a sinusoidal signal which is amplified by the power amplifier prior to being loaded on the first exciting coil and the second exciting coil, a magnetic field generated is propagated in two different coupling paths which are an indirect coupling energy path and a direct coupling energy path respectively, indirect coupling magnetic field signals are measured through the first detection coil and the second detection coil, the signals are acquired into the STM32 development board, and whether defects present or not can be visually displayed by observing amplitude of the signals and phase changes. Hall elements and oscilloscopes are not required, and the detection device has the advantages of high operability, low cost and the like and can be applied to various practical engineering.

Description

technical field [0001] The invention provides a metal pipeline defect detection device based on far-field eddy currents, which belongs to the field of electromagnetic non-destructive testing. Background technique [0002] Pipelines are widely used in many industries such as oil and gas, chemical industry, electric power and heating, which adds convenience to the transportation of various resources. However, these pipelines are prone to cracks, corrosion and other damages under high temperature and high pressure environments, which will affect production and life. Bring potential safety hazards, if not found in time, in the event of accidents such as explosions and leaks, considerable economic losses will be caused, and there may even be casualties. Therefore, it is necessary to study an effective non-destructive testing device, especially suitable for the pipeline environment. For the detection of defects such as corrosion, the existing non-destructive testing methods such ...

AI Technical Summary

Problems solved by technology

For the detection of defects such as corrosion, the existing non-destructive testing methods such as ray, ultrasonic, magnetic particle and penetration have their own shortcomings in adapting to the high and low temperature environment of the site and the surface condition of the equipment, for example: good coupling with the metal body is required , so that the ultrasonic wave can be transmitted and received between the sensor and the metal body; it is generally aimed at the measurement of the wall thickness at a certain point, and is not suitable for large-area scanning detection, so the detection speed is very slow

Images