A Method for Evaluating the Uniformity of Conductivity of Conductive Materials
A technology of conductive materials and uniformity, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as low efficiency, and achieve the effect of weakening influence and rapid quality sorting
Active Publication Date: 2017-12-05
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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Problems solved by technology
The conventional eddy current point probe detection method has limitations and low efficiency in the measurement of conductivity in different areas
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[0019] Examples such as figure 1 The first embodiment shown is a method for evaluating the uniformity of conductivity of conductive materials, which is characterized in that: the method of comparing the difference between the local average conductivity and the local point conductivity is used to detect the uniformity of conductivity of the tested conductive material 5, and the introduction of "average The eddy current detection probe 1 with a large detection surface is lifted away from a certain distance to detect and collect the local average conductivity influence signal of the conductive material 5 to be tested, and the eddy current detection point probe 2 is close to the surface of the conductive material 5 to be tested point by point Collect the influence signal of local point conductivity of the tested conductive material 5, and use the AC bridge circuit 4 to compare and analyze the difference between the detection signal corresponding to the local average conductivity an...
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The invention discloses a method for evaluating the uniformity of conductivity of conductive materials. The method of comparing the difference between the local average conductivity and local point conductivity is used to detect the uniformity of conductivity of the tested conductive materials, and the statistical quantity of "average" is introduced. The eddy current detection probe on the detection surface is lifted away from a certain distance to detect and collect the local average conductivity influence signal of the tested conductive material, and the eddy current detection point probe is close to the surface of the tested conductive material to detect and collect the local conductivity influence signal of the conductive material point by point, Use the AC bridge circuit to compare and analyze the difference between the detection signal corresponding to the local average conductivity and the detection signal corresponding to the local point conductivity, so as to weaken the influence of the uneven distribution of the local conductivity of the tested conductive material and the change of surface roughness on the detection signal. Influence, realize the rapid evaluation method of local conductivity uniformity with hardware, so as to perform rapid quality sorting on conductive materials.
Description
technical field [0001] The invention relates to a non-destructive testing method, in particular to a method for evaluating the uniformity of conductivity of conductive materials. Background technique [0002] The electrical conductivity of a material is an important physical performance index, and the electrical conductivity is an important physical quantity that characterizes the strength of a material's electrical conductivity. [0003] Eddy current testing is a non-destructive testing method based on the principle of electromagnetic induction, which is suitable for conductive materials. When the workpiece is placed in an alternating magnetic field, an eddy current is induced in the conductor, and the change in the conductivity of the workpiece will lead to a change in the induced current. This phenomenon can be used to detect the conductivity of the workpiece. [0004] With the development of science and technology, composite materials have been widely used in aerospace,...
Claims
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IPC IPC(8): G01R27/02
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD