Hilbert Transform Utilization for Additional Informative Features Receiving at the Pulsed Impedance Testing of Composite Materials
Keywords:Impedance method of testing, Hilbert transform
Background. The article is devoted to the problem of the information increasing for the impedance method of nondestructive testing. This method is one of the commonly used in aviation for testing honeycomb panels and sandwich structures made of composite materials.
Objective. The purpose of this article is to get for the pulsed impedance method of nondestructive testing the additional informative features which increase testing reliability of composite materials.
Methods. It was experimentally measured signals from defective and defectless areas of the test pattern. Utilization of the Hilbert transform gave possibility to determine phase characteristics of these signals and realize demodulation to extract a low-frequency envelope for further analysis of its shape.
Results. It was received the informative features as a result of researches. Among them are instantaneous frequency of a signal, the integral of a phase characteristic on the selected interval and the integral of a difference signal phase characteristics. In order to compare quality of the defect detection using selected parameters it was carried out evaluation of the testing result reliability for a product fragment made of a composite material.
Conclusions. The proposed informative features characterize a degree of phase characteristics difference and enable to increase general reliability of composite materials testing by the pulsed impedance method.
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