Apparatus for detecting transducer movement using a first and se

Details Apparatus for detecting transducer movement using a first and se Apparatus for detecting transducer movement using a first and se

1990-10-03

1991-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

128667, 356 41, H01J 516

Patent

active

050556711

ABSTRACT:
An apparatus for photo-optically detecting transducer motion in a transducer using a photodetector elastically suspended inside the transducer housing and photo-optically coupled to a light source. During movement the inertia effect of the photodetector along with the elastic suspension system causes the changes in the photo-optical coupling between the photodetector and the light source. The inertia effect of the photodetector is enhanced by adding a mass to the photodetector. Either the magnitude or the phase of the photodetector output is monitored to detect movement.

REFERENCES:
patent: 3095872 (1963-07-01), Tolles
patent: 3825342 (1974-07-01), Lubbers et al.
patent: 3970394 (1976-07-01), Stanton
patent: 4476875 (1984-10-01), Nilsson et al.
patent: 4494550 (1985-01-01), Blazek et al.
patent: 4590948 (1986-05-01), Nilsson
patent: 4854699 (1986-08-01), Edgar, Jr.

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