METHOD OF NON-CONTACT MEASUREMENT OF THE DIELECTRIC CONSTANT Russian patent published in 2012 - IPC G01R27/26 

FIELD: electrical measurements.

SUBSTANCE: invention relates to electrical measurements, namely to measure the dielectric constant of solid dielectric materials. The test sample that having the form of a plate placed near the surface of the sensor. Sensor is a piezoelectric plate with two counter-interdigital transducers. Sensor is provided with a continuous high-frequency electromagnetic signal, which is converted into a homogeneous piezoelectric active acoustic wave that propagating along a piezoelectric plate. Electric field of this wave penetrating into the sample, its speed changing and the phase of the output signal is also changing. The unknown value is determined from the measured phase with using the calibration curve which constructed by means of a reference samples set. The sample must have a fixed length and width, superior aperture of the wave. The thickness of the sample must be greater than half the thickness of the piezoelectric plate, and on the upper surface does not overlap any conditions (which may be irregular, not parallel to the bottom surface, a non-planar).

EFFECT: simplify the process and improve the accuracy of measurement for piezoelectric materials and materials with a relative permittivity above 8.

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