Data acquisition method and device based on FPGA control

Abstract

The invention discloses a data acquisition method and device based on FPGA control. The method comprises the following key steps that S1 an upper computer downwardly transmits a command to an FPGA chip via a USB; S2 the received command is analyzed, and electromagnetic ultrasonic detection or magnetic leakage detection is judged; S3 if the judgment result indicates electromagnetic ultrasonic detection, gating of A input is performed by a 2-1MUX module, and a pulse generation module generates an excitation signal to perform electromagnetic ultrasonic detection and data acquisition; and if the judgment result indicates magnetic leakage detection, gating of B input is performed by the 2-1MUX module, and magnetic leakage detection and data acquisition are performed. The invention also discloses the data acquisition device. Magnetic leakage detection and electromagnetic ultrasonic detection are successfully combined together based on FPGA chip control, connection with the upper computer is realized through the USB interface and the structure is enabled to be compact so that miniaturization of the device is facilitated and onside use is convenient.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a data acquisition method and device based on FPGA control. Background technique [0002] Ferromagnetic components such as steel pipes, steel plates and cables are widely used in petroleum, chemical industry, bridges and other fields. They may cause corrosion, cracks, wall thickness reduction and other failure modes during use, which will lead to the existence of potential safety hazards and endanger the safety of industrial production. And people's property interests, for this reason, the above ferromagnetic components are regularly tested. Both magnetic flux leakage and electromagnetic ultrasonic non-destructive testing methods have the advantages of non-contact and low requirements on the surface condition of ferromagnetic components, and are often used to detect ferromagnetic components. [0003] However, the two methods also have shortcomings. Magnetic flux leakage de...

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Problems solved by technology

Shang Yanwei et al [Shang Yanwei. Development of composite detection system for magnetic flux leakage and electromagnetic ultrasonic in boiler water-cooled wall tubes [D]. Hubei: Huazhong University of Science and Technology, 2012] only developed the magnetic flux leakage and electromagnetic ultrasonic thickness detection sensor, the corresponding The hardware processing system adopts two sets of independent upper computer and lower computer respectively to realize magnetic flux leakage and electromagnetic ultrasonic thickness measurement. The system is bulky, complex in structure, and inconvenient to use on site.

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