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Circuit device based on disturbed magnetic field detection instrument

A technology of circuit devices and detectors, applied in the direction of material magnetic variables, etc., can solve the problems of high price, not being widely used, and not developing detection instruments, so as to achieve good amplification and achieve the effect of detection and characterization

Inactive Publication Date: 2012-06-27
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of the instrument, the measurement accuracy needs to be improved, and it has not been widely used in our country.
At present, my country has not yet developed a mature and commercial testing instrument

Method used

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  • Circuit device based on disturbed magnetic field detection instrument
  • Circuit device based on disturbed magnetic field detection instrument
  • Circuit device based on disturbed magnetic field detection instrument

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Experimental program
Comparison scheme
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Embodiment Construction

[0022] Such as figure 1 As shown, the present invention is realized in this way, and it comprises regulated power supply 1, signal generator 2, trigger circuit 3, power amplifier 4, excitation coil 5, test piece 6, detection probe 7, signal conditioning circuit 8, correlator 9. A / D conversion circuit 10, computer 11, phase shifting circuit 12, square wave forming circuit 13, regulated power supply 1 is connected to signal generator 2, and signal generator 2 is respectively connected to trigger circuit 3 and power amplifier 4, and power amplifier 4 Connect the excitation coil 5, the excitation coil 5 is connected to the test piece 6, the test piece 6 is connected to the detection probe 7, the detection probe 7 is connected to the signal conditioning circuit 8, the signal conditioning circuit 8 is connected to the correlator 9, and the correlator 9 is connected to the A / D conversion circuit 10. The A / D conversion circuit 10 is connected to the computer 11, the trigger circuit 3 ...

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Abstract

The invention relates to a circuit device based on a disturbed magnetic field detection instrument and discloses a circuit system based on the disturbed magnetic field detection instrument. A total circuit of the detection system mainly consists of an excitation source module, a sensor module, a signal modulation circuit, a phase shifting circuit, a correlator circuit, an analog-to-digital (A / D) conversion circuit and a computer display system. The visual detection system capable of obtaining detection signal amplitude values and phase information is designed on the basis of unique advantages of Labview software in the respects of value analysis, image display, programming and the like by utilizing mutual correlation principles and an A / D data collecting card. The detection circuit has a good amplification effect on weak signals and simultaneously has a good inhibition effect on the noise. The circuit also has the advantages that the amplitude value and the phase of the defect signals can also be simultaneously detected, and the detection and characterization on the metal surface crack defect characteristics can be perfectly realized.

Description

technical field [0001] The invention relates to a circuit device of a detector, in particular to a circuit device based on a disturbance magnetic field detector. Background technique [0002] Traditional non-destructive testing methods such as magnetic particle testing and penetrant testing methods have high detection sensitivity, but they have high requirements on the surface of components, and need to clean the surface, such as paint removal, which increases a lot of maintenance man-hours and workload; ultrasonic testing is due to component The surface is rough and uneven and the acoustic coupling is poor, which makes it difficult to accurately and quantitatively judge damage; eddy current detection realizes non-contact detection without coupling medium, but due to many factors affecting the detection signal, it requires high quality inspection personnel, which may easily lead to missed judgments or Misjudgment affects the quality of detection. Disturbance magnetic field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
Inventor 任尚坤李忠基杨耀
Owner NANCHANG HANGKONG UNIVERSITY
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