Abstract

 
 
 The paper describes a miniaturized device that records changes in voltage amplitude and signal frequency. After applying the measuring probe to the surface of the tested material, the voltage and frequency amplitude changes. In a place free from defects and nonconformities values of voltage amplitude and frequency are taken as reference values, with which the results obtained during further tests are compared. A clear change in the value of any of the parameters indicates a change in the condition of the tested material. Registration of two parameters with different sensitivityfor selected factors allows for a more accurate analysis of the condition of the testedmaterial. The miniaturized device can works in manual measurement mode or in auto-matic mode, it can be used in defectoscopy, structure and thickness measurements.
 
 
Highlights
Non-destructive testing is widely used in practice to assess the quality of parts and components at the stage of their production, as well as to control the operation of existing structures
The basic phenomenon used in non-destructive testing by the eddy current method is electromagnetic induction
The method of conducting non-destructive tests using the eddy current method described in the paper extends the capabilities of measuring devices, which operate on the basis of a generator with a freely oscillating resonant circuit, by two-parameter measurement: measurement of voltage amplitude and signal frequency (U and f)
Summary
Non-destructive testing is widely used in practice to assess the quality of parts and components at the stage of their production, as well as to control the operation of existing structures. The basic phenomenon used in non-destructive testing by the eddy current method is electromagnetic induction It consists of generating electricity in a conductive material as a result of changing magnetic field on it. The method of conducting non-destructive tests using the eddy current method described in the paper extends the capabilities of measuring devices, which operate on the basis of a generator with a freely oscillating resonant circuit, by two-parameter measurement: measurement of voltage amplitude and signal frequency (U and f). At the Institute of Precision Mechanics, a miniaturized control and measurement device for non-destructive testing using the eddy current method and the amplitude-frequency measurement was developed – the M2 Wirotest. The change of the head is simple and fast, it does not require the operator to reconfigure the device
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