Electrical measurement based four-point type nondestructive test probe with adaptive adjustment

Abstract

The invention provides an electrical measurement based four-point type nondestructive test probe with adaptive adjustment. Three identical fixed electrodes of the test probe are uniformly distributed at a peripheral direction in a casing, and the electrodes are used as measuring electrodes; a movable electrode is positioned in the center of the housing and is used as an exciting electrode, the four electrodes are insulated and isolated by a filling material, and the four electrodes are connected to an external display apparatus through leads. The probe has the beneficial effects that the test probe can satisfy different measurement demands of parts with planes, recessed surfaces, and convex surfaces. The exciting electrode in the center of the probe has a movable structure, the height of the probe can be automatically adjusted according to the surface shape of the material to be detected, so that good attaching of the probe and the material to be detected is realized, and usage flexibility of the probe is improved. According to impedance between electrodes for testing and electrical characteristics of a material to be detected, the probe is suitable for nondestructive flaw detection of material components with weak conductivity, and the probe can be used for measuring materials whose conductivities are below 100000S/m; the probe has the advantages of simple integral structure, operation convenience, and good practicality.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection of weakly conductive materials, and in particular relates to a four-point self-adaptive adjustment non-destructive detection probe based on electrical measurement for a composite material plate with a certain conductivity and a relatively small radian. Background technique [0002] New carbon fiber composite materials are widely used in aircraft, ships and other large equipment. Since different types of damage and defects may occur during the manufacture and use of materials, timely and effective early diagnosis of materials and reasonable evaluation of their damage tolerance are important ways to ensure safe use. At present, widely used non-destructive testing methods include thermal imaging, ultrasonic testing, eddy current testing, scanning acoustic microscopy, and X-ray testing. [0003] Compared with the above detection methods, electrical detection has the advantages of no...

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Problems solved by technology

Although the formation of gaps between the two can be avoided, making the measured data more accurate, but because the electrode is fixed with the material under test, i

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