Low frequency vibration sensor

Details Low frequency vibration sensor Low frequency vibration sensor

1998-06-08

2000-08-29

Chapman, John E.

Measuring and testing

Vibration

Sensing apparatus

340566, G01H 1108

Patent

active

061091103

ABSTRACT:
A low frequency vibration sensor includes a permanent magnet, a sensor body, a steel spheroid, and a piezoelectric element. The sensor body has a pillar shape and is made of plastic material having a transverse separator section in a middle portion to divide the sensor body in an upper and a lower spaces. A depressed slot is formed around the upper space for disposing the magnet, while the lower space is made larger than the steel spheroid so as to accommodate it therein movably and also put under the influence of an attractive force of the magnet above. A piezoelectric element is set in along a grooved rail provided around the bottom edge of the sensor body to thereby form a closed space. The steel spheroid is movable to swing in the space such that its motion is conducted to the piezoelectric element to induce a corresponding low frequency electric signal between two electrodes of the piezoelectric element to thereby detect the vibration caused by an external force.

REFERENCES:
patent: 4086807 (1978-05-01), Nakada
patent: 4656458 (1987-04-01), Iwata
patent: 4723447 (1988-02-01), Laing

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