ELECTRO-ULTRASONIC SPECTROSCOPY OF CONDUCTING SOLIDS

ELECTRO-ULTRASONIC SPECTROSCOPY OF CONDUCTING SOLIDS

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The paper presents new principle of non-destructive testing of conducting solids. This method is based on ultrasonic phonons interaction with electrons in the nonlinear region caused by defect (“defect cased nonlinearity”). Tested sample is excited by harmonic AC electrical signal with frequency fE and ultrasonic wave with frequency fU. New harmonic signal with frequency fi is created on the defect caused nonlinearity. The frequency fi is given by the superposition or subtraction of exciting frequencies fE and fU. The advantage of this method consists in detection of electrical signal with frequency different from frequencies of excitation signals. Two ways for realisation of this principle are compared and ways to increasing of sensitivity are shown. The theoretical sensitivity of this method and its limitation by parasitic effect is also discussed. The usability and possibility of minimisation of parasitic effects are confirmed experimentally.

The paper presents new principle of non-destructive testing of conducting solids. This method is based on ultrasonic phonons interaction with electrons in the nonlinear region caused by defect (“defect cased nonlinearity”). Tested sample is excited by harmonic AC electrical signal with frequency fE and ultrasonic wave with frequency fU. New harmonic signal with frequency fi is created on the defect caused nonlinearity. The frequency fi is given by the superposition or subtraction of exciting frequencies fE and fU. The advantage of this method consists in detection of electrical signal with frequency different from frequencies of excitation signals. Two ways for realisation of this principle are compared and ways to increasing of sensitivity are shown. The theoretical sensitivity of this method and its limitation by parasitic effect is also discussed. The usability and possibility of minimisation of parasitic effects are confirmed experimentally.

Electro-ultrasonic spectroscopy, conducting solids

ŠIKULA, J., HÁJEK, K., SEDLÁKOVÁ, V., HEFNER, Š.

01.01.2006

DGZIP

Berlin

Abstracts of 9th European Conference of NDT

Fr.1.5.2

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