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Surface resistance testing probe, testing device thereof and surface resistance testing method

A surface resistance and testing device technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as large mechanical pressure, resistance deviation from normal resistance, and different resistance performance, so as to ensure good contact, Effect of contact avoidance, good test effect

Active Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For coatings and thin films, the mechanical four-probe method has two factors that have a greater impact on the test results. One is that the probes are hard metals, and the mechanical pressure is relatively high. Such materials are extremely easy to cause mechanical damage and have a greater risk of puncture; second, the probe is pressed to the surface of the coating or film material to be tested under high mechanical pressure, and the mechanical pressure will be transmitted to the lower contact through the probe. On the coating and thin film material, the inside of the coating and thin film material will form a compressed state. The resistance characteristics of the coating and thin film material in this compressed state are often different from the normal resistance performance, which makes the measured resistance deviate from the normal state. resistance

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  • Surface resistance testing probe, testing device thereof and surface resistance testing method
  • Surface resistance testing probe, testing device thereof and surface resistance testing method
  • Surface resistance testing probe, testing device thereof and surface resistance testing method

Examples

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Effect test

Embodiment 1

[0041] Example 1: A plexiglass plate with a length of 5 cm x a width of 3 cm x a thickness of 1 cm is placed on the surface of the test sample 1 as an insulating module 2. In the middle of the plexiglass plate, there are four Φ5 mm, center-to-center distances of 10 mm, arranged up and down in a straight line. Through-hole 3, put four copper wires, that is, metal wire 5, into the through-hole 3 from above the through-hole 3, and the length of the copper wire that penetrates into the through-hole 3 is 8 mm, and connect the four copper wires to a resistance tester On the instrument, the connection method is: 5 metal wires connected to the two through holes 3 outside the four through holes 3 are connected to the current terminal of the resistance tester, and 5 metal wires connected to the two through holes 3 in the middle of the four through holes 3 are connected to the current terminal of the resistance tester. The voltage terminal of the resistance tester. Open the resistance te...

Embodiment 2

[0042] Embodiment 2: A ceramic plate with a length of 6 cm × width of 4 cm × thickness of 2 cm is placed on the surface of the test sample 1 as the insulating module 2. In the middle of the ceramic plate, there are four through holes of Φ3 mm and a center distance of 5 mm arranged in a straight line. Hole 3, put four copper wires, that is, metal wires 5, into the through hole 3 from above the through hole 3, and the length of the copper wires that go deep into the through hole 3 is 15 mm, and connect the four copper wires to a resistance tester , the connection method is: the metal wires connected to the two through holes 3 outside the four through holes 3 are connected to the current terminal of the resistance tester, and the metal wires connected to the two through holes in the middle of the four through holes 3 are connected to the resistance tester. voltage terminal. Turn on the resistance tester, inject mercury 6 into the four through holes 3 until the liquid level of mer...

Embodiment 3

[0043] Example 3: A polyaniline board with a length of 5 cm x width of 2 cm x a thickness of 1.5 cm is placed on the surface of the test sample 1 as the insulating module 2. In the middle of the polyaniline board, there are four sides with a length of 4 mm and a center distance of 6 mm, arranged in a straight line The through-hole 3 that penetrates up and down is drilled from the back of the polyaniline board and then put four aluminum wires, that is, the metal wire 5, into the through-hole 3 from the side of the through-hole 3, and the length of the aluminum wire that penetrates into the through-hole 3 is 3mm, connect these four aluminum wires to a resistance tester. The metal wire 5 connected to the two through holes 3 in the middle of the hole 3 is connected to the voltage end of the resistance tester. Turn on the resistance tester, inject mercury 6 into the four through holes 3 until the liquid level of mercury 6 is flush with the surface of the polyaniline board, and reco...

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Abstract

The invention discloses a surface resistance testing probe, a testing device thereof and a surface resistance testing method. Through replacing a mechanical probe for measuring the surface resistance according to a four-probe method by liquid mercury as a testing probe, defects of coating and film damage and remarkable force bearing state change of a to-be-tested material by the mechanical probe can be effectively overcome, thereby obtaining more accurate measurement results. Furthermore the invention provides a corresponding resistance testing device in which mercury is used as the testing probe, wherein the mercury probe can be conveniently used for testing the surface resistance of a sample, and furthermore the mercury can be conveniently and quickly injected and recycled. The resistance testing device has advantages of concise design, convenient use, accurate and repeatable testing result and good effect. The resistance testing method and the testing device in which mercury is used as the testing probe can be used for the sample with an easy-damage surface and have advantages of effectively preventing sample surface damage and reducing an interference of an overlarge testing pressure to the surface resistance of the to-be-tested sample, and particularly the coating sample.

Description

technical field [0001] The invention relates to a probe for measuring surface resistance, and also relates to a device using the probe for measuring surface resistance, and a method for testing surface resistance using the device. Background technique [0002] The existing method for testing the surface resistance of coatings and film samples is the mechanical four-probe method. Its basic testing principle is that the resistance meter is connected with a four-probe probe, and there are four equidistantly arranged, retractable probes on the probe plane. Press the probe on the surface of the material to be tested, and the resistance meter can display the surface resistance of the material. The specific principle is that the two probes at the outer end generate a current field, and the two probes at the inner end test the current field on these two probe points. The formed potential, because the greater the resistance of the material, the greater the potential generated, thus m...

Claims

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Application Information

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IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 李荐黄祖琼周宏明王利华
Owner CENT SOUTH UNIV
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