Electro-mechanical transducer

Details Electro-mechanical transducer Electro-mechanical transducer

1982-02-04

1983-05-24

Kreitman, Stephen A.

Measuring and testing

Vibration

Sensing apparatus

G01H 312

Patent

active

RE0312487

ABSTRACT:
An electro-mechanical transducer is disclosed for measuring physical parameters such as vibration, acceleration or the angular orientation of an object to which it is attached. A closed container partially filled with a fluid, has a light source and light detector mounted in optical communication with the container's interior. The arrangement of the detector and light source is such that light from the source must pass at least once through the surface (i.e., air-fluid interface) of the fluid before being detected. A constant incident light intensity is provided within the chamber and the resultant transmitted light is measured by the detector and an associated meter circuit. As the container is vibrated, or the angular relationship of the surface of the liquid with respect to the detected light rays is varied, the light transmissive and refractive properties of the liquid surface are altered, thereby altering the output of the light detector.

REFERENCES:
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patent: 2324304 (1943-07-01), Katzman
patent: 3107529 (1963-10-01), Johnston
patent: 3302746 (1967-02-01), Ikrath
patent: 3464276 (1969-09-01), Leibert
patent: 3683347 (1972-08-01), Melone
patent: 3908129 (1975-09-01), Akers
patent: 3918817 (1975-11-01), Posgate
patent: 4058737 (1977-11-01), Takahashi et al.
patent: 4083255 (1978-04-01), McKechnie
patent: 4124841 (1978-11-01), Kettunen

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