Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-01-24
1982-03-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73655, G01D 534
Patent
active
043214649
ABSTRACT:
A device for measuring vibration is herein disclosed and claimed, said device comprising: a vane attached to a vibratory member; a light supply and at least one detector; and light guides. The vane includes or is attached to a mask having therein a plurality of light directing and light opaque elements. During vibration the mask travels transversely of the light path. The elements of the mask may be encoded, as with a Gray Code, so as to yield both amplitude and phase information. Or the elements may be so arranged as to chop the light into a plurality of pulses for each vibration of the vane through the use of a second, stationary mask. In either case the device yields information whose interpretation is substantially independent of fluctuations in the intensity of the source light.
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Lanyi William D.
Nelms David C.
Westinghouse Electric Corp.
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