Alternating current electromagnetic field detector

Abstract

The invention discloses an FPGA (Field Programmable Gate Array)-based alternating current electromagnetic field crack detector which comprises an FPGA digital circuit, a DDS (Digital Display Scope) exciting source, a power amplification circuit, an exciting coil, a detection sensor, a preamplifier, a signal conditioning board, an AD (Analog-digital) conversion circuit, a key circuit and a communication circuit. An FPGA is used as a control chip of an alternating current electromagnetic field detection system to design an exciting source module with an adjustable frequency and a phase and design an alternating current electromagnetic field detection sensor, a signal conditioning circuit, the AD conversion circuit and the communication circuit. The FPGA-based alternating current electromagnetic field crack detector has the technical effects that through the design of an FPGA chip control-based alternating current electromagnetic field detection digital circuit system, control over an peripheral hardware circuit module by the alternating current electromagnetic field crack detector is realized, the shortcomings of narrow measurement range, low measurement precision and single measurement of the current detector are overcome, and the flexibility and the intelligence of detection are improved; the FPGA-based alternating current electromagnetic field crack detector can be applied to overhead work and a complicated detected workpiece.

Description

technical field [0001] The invention relates to a detector, in particular to an AC electromagnetic field detector. Background technique [0002] Alternating Current Field Measurement (Alternating Current Field Measurement) is an active scanning detection technology based on Faraday's electromagnetic induction principle. This technology was first used in the nondestructive testing of underwater structures and offshore platform equipment for oil and gas. There are problems of missed detection and missed judgment in the underwater detection platform. This technology uses the principle of electromagnetic induction to induce alternating current on the surface of the workpiece to be tested, and judges the size of the defect by measuring the induced magnetic field formed by the disturbance of the workpiece surface or near-surface defects on the alternating current, and then evaluates the state and performance of the workpiece to be tested. [0003] AC electromagnetic field detecti...

AI Technical Summary

Problems solved by technology

[0006] Although there are scientific research institutes in our country that have developed related instruments for AC electromagnetic field detection, their application range is still quite narrow, and the measurement sensitivity and accuracy need to be improved.

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