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A device and method for automatically suppressing signal drift of absolute eddy current detection

An eddy current detection and signal drift technology, which is applied in the direction of measuring devices, electromagnetic measuring devices, and electric devices, etc., can solve the problems of detection coil temperature drift, detection misjudgment, eddy current detection signal drift deviation, etc.

Active Publication Date: 2019-03-22
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In service pipeline eddy current wall thickness measurement or eddy current material sorting and heat treatment state evaluation, an absolute detection coil is required. The working principle is that the signal generator in the eddy current detector excites the detection coil, and the eddy current detection signal collected by the detection coil passes After pre-amplification, phase-sensitive detection, filtering and other processing, the display output will cause temperature drift due to the heating of the detection coil due to long-term excitation. The eddy current detection signal drifts and deviates, causing detection misjudgment

Method used

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  • A device and method for automatically suppressing signal drift of absolute eddy current detection
  • A device and method for automatically suppressing signal drift of absolute eddy current detection

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Embodiment 1

[0028] Embodiment 1, a method for automatically suppressing the signal drift of absolute eddy current detection, taking the material sorting of metal materials as an example, the metal materials to be tested arrive at the detection stations one by one in a rhythmic manner, including the following steps,

[0029] a. When a metal material to be inspected arrives at the detection station, the detection coil 3 is placed on the detection surface of the metal material to be inspected, and the microprocessor 1 controls the signal generator 2 to excite the detection coil 3 to detect the metal material to be inspected, and the detection coil 3 will collect The absolute eddy current detection signal is processed by the preamplifier 4 and the post-processing unit 5 and then displayed and output;

[0030] b. Then the detected metal material is moved out of the detection station, and the microprocessor 1 controls the signal generator 2 to immediately stop exciting the B detection coil 3;

...

Embodiment 2

[0034] Embodiment 2, a method for automatically suppressing the signal drift of absolute eddy current detection, taking the measurement of the wall thickness of an in-service pipeline as an example, it is necessary to detect the wall thickness of the pipeline point by point, including the following steps,

[0035] a. When the detection coil 3 is placed at a detection point on the pipeline wall, the microprocessor 1 controls the signal generator 2 to excite the detection coil 3 to detect the metal material to be detected, and the detection coil 3 passes the collected absolute eddy current detection signal through the preamplifier 4. The post-processing unit 5 displays the output after processing;

[0036] b. When the detection coil 3 is lifted away from the detection point, the microprocessor 1 controls the signal generator 2 to immediately stop exciting the B detection coil 3;

[0037] c. The microprocessor 1 controls the post-processing unit 5 to feed back the zero drift data...

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Abstract

The invention discloses a device and a method used for automatically inhibiting an absolute eddy current detection signal from drifting. According to in-service pipeline wall thickness measurement, or material sorting or heat treatment state evaluation e.g., automobile component heat treatment state evaluation, which are all beat work modes, an eddy current detector employs an intermittent excitation mode, a before-and-after detection beat gap of in-service pipeline wall thickness measurement or material sorting is utilized, temperature change of a detection coil and signal zero drift caused by a front amplifier and a post-processing unit are automatically inhibited, shutdown for stopping detection and calibration on an eddy current detector is not needed, and in-service pipeline wall thickness measurement or material sorting can be continuously carried out according to detection beats.

Description

Technical field [0001] The invention relates to a non-destructive testing device and method, in particular to a device and method for automatically suppressing signal drift of absolute eddy current testing. Background technique [0002] In service pipeline eddy current wall thickness measurement or eddy current material sorting and heat treatment state evaluation, an absolute detection coil is required. The working principle is that the signal generator in the eddy current detector excites the detection coil, and the eddy current detection signal collected by the detection coil passes After pre-amplification, phase-sensitive detection, filtering and other processing, the display output will cause temperature drift due to the heating of the detection coil due to long-term excitation. The eddy current detection signal drifts and deviates, causing detection misjudgment. The standard "YB / T 127-1997 Ferrous Metal Electromagnetic (Eddy Current) Sorting Inspection Method" stipulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/06
CPCG01B7/10
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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