Eddy Current Steel Plate Surface Testing Device
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Solution Overview
Problem
Existing methods for measuring the hardness of large steel plates are either destructive or lack accuracy, particularly when trying to assess the material properties of steel plates with lengths of several meters to tens of meters.
Innovation Solution
A steel plate surface material property testing device and method utilizing an eddy current tester with a coil forming an AC magnetic field in one direction, coupled with a sensor unit and a material property determination unit, to accurately determine the material properties of steel plates by generating and measuring eddy currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a destructive hardness measurement method is used to measure steel plate hardness, then measurement accuracy is improved, but the steel plate surface is damaged and cannot be used for large-scale measurement
Solution Approach 1:
The patent replaces the mechanical contact-based destructive hardness measurement method with a non-contact eddy current measurement system. The coil generates a magnetic field that induces eddy currents in the steel plate surface, and the sensor detects changes in the magnetic field caused by material properties, eliminating the need for mechanical contact and surface damage.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the measurement system and the steel plate. The coil generates the magnetic field, which penetrates the steel plate surface without contact, inducing eddy currents that reflect material properties. This intermediary enables measurement without direct physical contact or damage to the steel plate.
2Ease of operation
If existing eddy current measurement methods are used to measure steel plate characteristics, then non-contact measurement is achieved, but measurement accuracy is insufficient
Solution Approach 1:
The patent optimizes the magnetic field distribution by configuring the coil geometry and positioning to concentrate the magnetic field specifically at the steel plate surface measurement point. This localized field concentration enhances the eddy current effect at the measurement location, improving signal strength and measurement accuracy while maintaining non-contact operation.
Solution Approach 2:
The patent adjusts key parameters including coil winding configuration, AC excitation frequency, and coil-to-plate distance to optimize the eddy current measurement. By tuning these parameters, the system achieves both non-contact operation and high measurement precision for steel plate material properties.
3Measurement precision
If traditional hardness measurement methods are applied to entire steel plate surfaces, then comprehensive material property assessment is possible, but measurement time becomes excessively long
Solution Approach 1:
The patent enables continuous scanning measurement by moving the coil assembly along the steel plate surface in a systematic pattern. The eddy current measurement can be performed continuously at multiple points without stopping or resetting, allowing rapid comprehensive assessment of large steel plate areas while maintaining measurement accuracy.
Solution Approach 2:
The patent divides the large steel plate surface into multiple measurement sections that can be scanned systematically. The coil assembly moves between sections, performing measurements at each location, which allows comprehensive coverage of the entire plate while maintaining efficient measurement throughput and acceptable total measurement time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables rapid and accurate testing of material properties across the entire surface of steel plates, overcoming the limitations of traditional methods by providing precise hardness measurements without damaging the material.
Implementation Method 1
a coil disposed so as to form an alternating-current (AC) magnetic field in only one direction
Implementation Method 2
determining a material property of a steel plate by generating an eddy current in the steel plate
Data Source
AI summary
The steel plate material property testing device determining a material property of a surface of the steel plate by generating the eddy current in the steel plate includes: an eddy current tester disposed so as to face the steel plate; and a frame to which the eddy current tester is fixed, in which the eddy current tester includes: a coil disposed so as to form an alternating-current (AC) magnetic field in only one direction; an AC power supply unit connected to the coil; a sensor unit connected to the coil; and a material property determination unit connected to the sensor unit and determining the material property of the steel plate based on a measured signal obtained through the sensor unit.