CN-224216627-U - Pulse eddy current measuring probe combining coupling and difference

Abstract

The utility model discloses a pulse eddy current measuring probe combining coupling and differential, which comprises a shell, wherein a transmitting coil, a coupling receiving coil and a differential receiving coil are arranged in the shell, the transmitting coil and the coupling receiving coil are concentrically arranged in a coupling mode, the differential receiving coil is arranged on the inner side of the transmitting coil, a multi-core quick plug is arranged on the shell, the transmitting coil, the coupling receiving coil and the differential receiving coil are respectively connected with the multi-core quick plug through leads, and the multi-core quick plug is connected to a pulse eddy current host. In the moving measurement process, the measuring probe provided by the utility model provides an analysis signal for measuring metal loss in the magnetic field coverage range for the pulse eddy current host through the coupling receiving coil, and provides an analysis signal for measuring the approximate condition of the superficial crack in the magnetic field coverage range for the pulse eddy current host through the differential receiving coil, so that the pulse eddy current detection combining coupling and differential is realized.

Inventors

• HU XIAOPING

Assignees

• 青岛山科海洋环境工程有限公司

Dates

Publication Date

20260508

Application Date

20250414

Claims (10)

1. 1. The pulse eddy current measuring probe combining coupling and differential is characterized by comprising a shell, wherein a transmitting coil, a coupling receiving coil and a differential receiving coil are arranged in the shell, the transmitting coil and the coupling receiving coil are concentrically arranged in a coupling mode, the differential receiving coil is arranged on the inner side of the transmitting coil, a multi-core quick plug is arranged on the shell, the transmitting coil, the coupling receiving coil and the differential receiving coil are connected with the multi-core quick plug through leads respectively, and the multi-core quick plug is connected to a pulse eddy current host.
2. 2. The pulse eddy current measuring probe combining coupling and differential according to claim 1, wherein the transmitting coil and the coupling receiving coil are concentrically arranged in a coupling manner, namely, the transmitting coil and the coupling receiving coil are concentrically sleeved, and the coupling receiving coil is arranged outside the transmitting coil.
3. 3. A pulsed eddy current measurement probe coupled in combination with a differential of claim 1, wherein the differential receive coil is comprised of a first coil and a second coil in parallel.
4. 4. A pulsed eddy current measurement probe coupled with differential according to claim 1, wherein the copper core of the multi-core quick plug is at least six-core.
5. 5. A pulsed eddy current measurement probe combining coupling and differencing according to claim 1, wherein the transmit coil, the coupled receive coil, and the differencing receive coil are each provided with at least two lead wires and are each connected to copper cores in different positions of a multi-core quick plug.
6. 6. A pulsed eddy current measurement probe combining coupling and differencing according to claim 1, wherein the pulsed eddy current host is a dual channel pulsed transceiver.
7. 7. A pulsed eddy current measurement probe coupled in combination with a differential according to claim 1, wherein the multi-core quick plug is connected to a pulsed eddy current host through a concentric cable.
8. 8. A pulsed eddy current measurement probe combining coupling and differencing according to claim 1, wherein the transmit coil, coupled receive coil are circular or square or diamond or polygonal in shape.
9. 9. A pulsed eddy current measurement probe coupled with differential according to claim 3, wherein the first coil and the second coil are circular or square or diamond or polygonal in shape.
10. 10. The pulse eddy current measuring probe combining coupling and differential according to claim 1, wherein the wire diameter protection range of the transmitting coil, the coupling receiving coil and the winding enamelled wire of the differential receiving coil is 0.1-2.0mm.

Description

Pulse eddy current measuring probe combining coupling and difference Technical Field The utility model belongs to the technical field of pulsed eddy current detection, and particularly relates to a pulsed eddy current measuring probe combining coupling and differential. Background The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. The vast majority of materials of pressure vessels, pipelines and the like in petrochemical industry are ferromagnetic materials, and under the working conditions of high temperature and high pressure, high sulfur content, acid and alkali content and the like, the phenomena of metal loss or corrosion thinning can occur on the inner wall of the pressure vessels, pipelines and the like along with the increase of the service operation period of equipment. Common corrosion types include uniform thinning over a large area, local scour thinning over a large area, thinning over a small area but greater depth, and the like. The loss of these metals is the main cause of penetration leakage of the device. Once a leak occurs in the pressure vessel or pressure pipe, it can have serious or even catastrophic consequences. The pulsed eddy current technology uses electromagnetic induction principle, and belongs to non-contact nondestructive detection. The pulse eddy current detection does not need to remove rust and paint, does not need to polish a metal body, does not need a coupling agent, does not need to fear high temperature and low temperature, can accurately detect the internal and external corrosion defects of a pipe wall, positions the corrosion positions of the pipe wall, roughly estimates the corrosion allowance, plays a positive supplementary role in corrosion management in petrochemical industry, has been widely applied to the fields of refining, chemical industry, power plants, nuclear industry and the like, and ensures that the quick positioning search of the corrosion defect positions and the approximate measurement of the corrosion degree of the pipe or a container and the like can be carried out by the technical advancement. The inventor finds that the existing pulse vortex technology mainly aims at detecting the abnormal relative wall thickness of a steel tank body or a pipeline with a coating layer, and the spatial resolution of the pulse vortex technology is directly related to the lifting height. The greater the probe lift-off, the lower the spatial resolution (i.e., the lower the sensitivity to the size of the etch pit found). For some special high-risk positions, the relative wall thickness change and the superficial crack setting judgment are accurately detected. At this time, the insulation needs to be removed, and the pulsed eddy current technology is used for accurately detecting the inner wall corrosion and the shaping of the superficial cracks aiming at the high risk position of the bare pipe. The existing pulsed eddy current technology only aims at qualitative semi-quantitative detection of metal loss in the magnetic field coverage area of the probe, and can not perform qualitative analysis on shallow cracks on the steel surface in the magnetic field coverage area at the same time. Disclosure of utility model The utility model aims to overcome the defects in the prior art and provide a pulse eddy current measuring probe combining coupling and difference, wherein the measuring probe can be used for semi-quantitatively measuring the relative average wall thickness change of the magnetic field coverage range of a transmitting coil of the probe, qualitatively measuring the basic condition of shallow large cracks in the magnetic field coverage range of the transmitting coil, detecting metal loss of a bare pipe and qualitatively judging the shallow cracks in the moving measurement process. In order to achieve the above object, the present utility model is realized by the following technical scheme: The technical scheme of the utility model provides a pulse eddy current measuring probe combining coupling and differential, which comprises a shell, wherein a transmitting coil, a coupling receiving coil and a differential receiving coil are arranged in the shell, the transmitting coil and the coupling receiving coil are concentrically arranged in a coupling way, the differential receiving coil is arranged on the inner side of the transmitting coil, a multi-core quick plug is arranged on the shell, the transmitting coil, the coupling receiving coil and the differential receiving coil are respectively connected with the multi-core quick plug through leads, and the multi-core quick plug is connected to a pulse eddy current host. In at least one embodiment, the concentric coupling arrangement of the transmitting coil and the coupling receiving coil is that the transmitting coil and the coupling receiving coil are sleeved concentrically, and the coupling receiving coil is arranged outside the