A fully digital high-precision three-dimensional magnetic flux leakage signal acquisition device

Abstract

An all-digital high-precision three-dimensional magnetic flux leakage signal acquisition device, including more than three three-axis magnetic field sensors, the signal output of the three-axis magnetic field sensor is connected to the input of the FPGA, the output of the FPGA is connected to the input of the main control chip, and the main control chip The output of the sensor is connected to the USB interface, and the USB interface sends the data through an external cable. The number of three-axis magnetic field sensors can be adjusted according to the size of the detected object to achieve a good adaptation to different detection accuracy requirements. FPGA has rich IO The interface acts as a relay for data sorting and sending, and can satisfy the parallel access of multi-channel data. The main control chip uses USB to send data, which has high transmission speed and is not easily disturbed. The present invention has high spatial accuracy and multi-channel The advantages of synchronous acquisition, strong anti-interference ability, high detection accuracy, simple structure and easy to use.

Description

technical field [0001] The invention relates to the technical field of signal acquisition devices, in particular to an all-digital high-precision three-dimensional magnetic flux leakage signal acquisition device. Background technique [0002] As a common ferromagnetic material: steel is widely used in the national economy, but many steel products are subjected to corrosion and loads from the external environment during use, and the material may have defects, resulting in changes in the structure and shape of the material. It is the most widely used non-destructive testing technology to detect defects by magnetic flux leakage testing on ferromagnetic material products. The current magnetic flux leakage detection equipment mainly adopts one-dimensional magnetic flux leakage detection, but in order to accurately determine the size of the defect, it is often necessary to detect the three-dimensional magnetic field leakage of the defect. [0003] In the published document "Devel...

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Problems solved by technology

The patent application with the application number 201010266215.X "Low Power Consumption Intelligent 3D Magnetic Flux Leakage Detection Probe" and the patent application with the application number 201110051160.5 "Fully Digitalized 3D Flux Leakage Signal Acquisition System for Metal Pipeline Corrosion Defects" also use three one Three-dimensional magnetic flux leakage sensors are used to measure three magnetic field components in perpendicular directions to achieve the purpose of three-dimensional magnetic flux leakage detection. However, the three-dimensional detection methods mentioned in the two documents and two patent applications have inherent defects, namely It is impossible to coincide the measuring points of multiple magnetic sensors at one point. Limited by the size of the sensor itself, the distance between the detection centers of the two sensors is at least 3-4mm. Therefore, when measuring the three-dimensional leakage magnetic field at a certain point in space, it is practical What is measured is the magnetic field leakage data at three different points in the space, and there is a large position error; at the same time, the three-dimensional magnetic flux leakage detection proposed in the above documents and patent applications adopts a multiplexing method, and each group The sensors are time-divisionally gated, which results in time differences when different groups of sensors measure the magnetic field

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