Non-contact composite material frequency domain dielectric spectroscopy measurement method

Abstract

The invention discloses a non-contact composite material frequency domain dielectric spectroscopy measurement method. The method comprises the steps that test voltage, frequency range and a frequency interval parameter are input into a dielectric spectroscopy tester through preset software as required; a composite material is placed between test electrodes; the height of the top electrode is adjusted, so that the distance between the electrodes is greater than the thickness of the composite material, namely the dielectrics of the composite material and air exist between the electrodes at the same time; variable frequency voltage excitation is applied on the electrodes, and at the same time current is measured, so as to calculate complex capacitance at the simultaneous presence of air and the composite capacitance under corresponding frequency; the composite material is removed from the electrodes, so that only the dielectric of air exists between the electrodes; variable frequency voltage excitation is applied on the electrodes, and at the same time current is measured, so as to calculate complex capacitance at the presence of air under corresponding frequency; and a complex dielectric constant and dielectric loss angle tangent of the composite material are calculated according to a formula. The method has the advantages that the polarization loss of the material is accurately measured and the like.

Description

technical field [0001] The invention relates to a technique for measuring the frequency-domain dielectric spectrum of composite materials, in particular to a non-contact method for measuring the frequency-domain dielectric spectrum of composite materials. The method adopts a non-contact electrode and utilizes air dielectric Spectrum as a reference calibration, combined with a series model of air and composite materials, a method for measuring the frequency domain dielectric spectrum of composite materials. Background technique [0002] Frequency-domain dielectric spectroscopy is an important tool for analyzing the dielectric properties of composite materials. The method measures the material polarization response under the action of an AC electric field, and performs point-by-point or frequency-sweep measurements on different electric field frequencies, so as to obtain the relationship between the complex dielectric constant of the measured object and the measurement frequen...

AI Technical Summary

Problems solved by technology

But these conductive materials face various problems

For example, aluminum is easy to produce oxide layer, silver is easy to migrate in high temperature or high humidity environment, and the cost of gold is too high

Metal foil electrodes are too thin, so it is difficult to determine the size of the electrodes and the thickness of the material

Toothed electrodes can increase the test capacitance of the measured object and improve the surface contact problem, but it is difficult to produce

Liquid electrodes such as mercury and sodium chloride aqueous solutions may be toxic or easily invade the interior of the material when in contact with the surface of the material to be tested, affecting the dielectric properties of the material

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