Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-07-11
1976-08-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
331266, 250231R, 250570, 250227, 340347AD, H01J 314
Patent
active
039756335
ABSTRACT:
An optical encoder unit for generating digital electrical signals defining the absolute level of a liquid in a tank from the translational position of a perforated tape in a conventional liquid level gauge and providing both local and remote readout. A pre-encoded film strip has a plurality of laterally spaced longitudinally extending tracks with transparent and opaque regions encoded in Gray code format, is received on a pair of freely rotatable spools, and is guided past an optical detection station by a pair of spaced stationary guide members. A rotatable sprocket having an input shaft adapted to be driven by a shaft coupled to a sprocket in a conventional perforated tape liquid level gauge drives the film strip past the detection station in response to movement of the tape. A spring biased pivotally mounted tension arm having a guide in surface contact with the film strip maintains tension therein as the film strip is moved from reel to reel. The spools are mechanically interlinked with a drive belt to provide film take-up either direction.
The optical detection station includes a light source assembly for generating a plurality of laterally spaced light beams and a detector assembly having a corresponding plurality of photosensitive devices each associated to a different one of the light beams and shielded from the remaining beams. The film strip is positioned so that each track occupies the light path between a different one of the beams and photosensitive devices to define a plurality of information channels.
REFERENCES:
patent: 3034217 (1962-05-01), Mayes et al.
patent: 3558861 (1968-05-01), Collins et al.
patent: 3658429 (1972-04-01), Zipin
patent: 3685358 (1972-08-01), Hubner et al.
E. & J. Gallo Winery
Nelms David C.
LandOfFree
Analog to digital encoder unit employing a pre-encoded film does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Analog to digital encoder unit employing a pre-encoded film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog to digital encoder unit employing a pre-encoded film will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1487840