Vibration measuring and the apparatus therefor

Details Vibration measuring and the apparatus therefor Vibration measuring and the apparatus therefor

1974-08-08

1976-07-20

Queisser, Richard C.

Measuring and testing

Moisture content or absorption characteristic of material

73DIG4, G01H 100

Patent

active

039699277

ABSTRACT:
A method of measuring the mechanical vibration of an object comprising contacting one of the surfaces of a piezoelectric element comprising a polarization treated polyvinylidene fluoride piezoelectric film having metal thin films as electrodes deposited on both surfaces thereof with an object to be measured while covering the opposite surface of the piezoelectric element contacting with the object to be measured with a flexible sound absorbing material for avoiding interference with sound waves in the surroundings and measuring or detecting the vibration of the object by the changes in the electric field caused by the vibration of the object and produced on the surface of the piezoelectric element.

REFERENCES:
patent: 3239696 (1966-03-01), Burkhalter et al.
patent: 3365593 (1968-01-01), Roof et al.
patent: 3720285 (1973-03-01), Russell et al.
patent: 3750127 (1973-07-01), Ayers et al.
patent: 3792204 (1974-02-01), Murayama et al.
patent: 3832580 (1974-08-01), Yamamuro et al.
patent: 3903733 (1975-09-01), Murayama et al.

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