Eddy current array detection apparatus based on compressed sensing and detection method thereof, and eddy current array probe

Abstract

The invention relates to an eddy current array detection apparatus based on compressed sensing and a detection method thereof, and an eddy current array probe. The eddy current array detection apparatus comprises an excitation signal generator, a power amplifier, the eddy current array probe, a signal acquisition module, a FPGA controller and a PC host computer. The eddy current array probe is composed of eddy current probe units, and each eddy current probe unit is composed of a probe shell, a tip, a bottom cover, mounting nuts, excitation coils, coil formers, an iron core, a TMR magnetic sensor and a printed circuit board. According to the invention, in virtue of the characteristic of sparsity of array signals, the precision of signal reconstruction is guaranteed and signal sampling frequency is greatly reduced, so requirements on hardware modules like sampling circuits are lowered, the amount of sample data is reduced, hardware burden in data acquisition, transmission and storage is mitigated, and the service life of equipment is prolonged; and for portable instruments powered by limited energy and equipped with array probes, energy consumption for sampling and calculating can be greatly saved, and the service life of the portable instruments can be substantially prolonged.

Description

technical field [0001] The invention relates to an eddy current array detection device based on compressed sensing, a detection method thereof and an eddy current array probe, belonging to the technical field of nondestructive detection. Background technique [0002] At present, when conventional eddy current testing devices use array probes to scan, in order to obtain undistorted signals, signal sampling must follow the Shannon-Nyquist (Shannon-Nyquist) sampling theorem, and the sampling rate should not be lower than twice the highest frequency of the original signal. or even higher. Such a high-frequency data acquisition method increases the hardware circuit load, data transmission volume and storage capacity, which will lead to high data transmission delay and shorten the service life of equipment. Therefore, it is very necessary to design a new type of detection device, which can still ensure the accuracy of signal restoration at a lower sampling frequency, so as to red...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an eddy current array detection device based on compressive sensing, and at the same time provides an eddy current array probe in the eddy current array detection device based on compressive sensing and a detection method of the eddy current array detection device based on compressive sensing, so as to overcome conventional eddy current detection When the device uses an array probe to scan, in order to obtain an undistorted signal, data must be collected at a high sampling frequency, and the data transmission volume is large and the hardware circuit load is high.

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