Abstract
Problems arising in the use of nondestructive dielectric relaxation spectrometry with unilateral capacitance transducers for quality control of composites are treated. A proposal is made to base dielectric spectrometry on identification of the ‘test-piece/unilateral capacitance transducer’ system in combination with multi-parameter control by variation of the electric field topography and relaxation analysis. The test-piece in multi-parameter dielectric spectrometry is treated as a system having one input and several outputs, the number of which corresponds to the number of input parameters, while the model of the unilateral capacitance transducer is conceived as a system with several inputs and one output. It is suggested that the processing should be accomplished by logarithmic sampling; this is in accordance with the behaviour of relaxation signals and allows one, by digital filtering, to perform integral transforms in order to change the information from the time to the frequency domain and calculate relaxation spectra. Results of quality control of composites by means of dielectric spectrometry in the processes of polymerization, damage accumulation and water absorption are presented.
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