Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-07-06
1982-10-26
Sloyan, T. J.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340347M, 340347P, 340347AD, 350 961, G02B 514, H03K 1302
Patent
active
043563953
ABSTRACT:
A digital fiber optic sensor system utilizing a conventional n-track encoder system, but wherein the number of fiber optic paths to and from the sensor is reduced to one or two by utilizing the delay properties of optical fibers. These properties make it possible to divide a single short-duration optical pulse among several optical fibers of differing lengths to produce, at the far ends of the fibers, a like number of short-duration optical pulses essentially identical in shape and amplitude but spaced in time. Each of these fibers can be used to illuminate a different track of a multi-track optical encoder such that the tracks become sequentially interrogated by the time-spaced pulses. When the time-spaced responses are recombined, they form a serial binary word. In effect, a form of time-division multiplexing is achieved with the use of a minimum number of optical fiber elements.
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The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/72, pp. I-8; II-44, 45, 80 & 81.
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American Optical Company, Fast, Quiet, Reliable Fiber-Optic, "Readers", 7/68, 1 page.
Murray Thomas H.
Sloyan T. J.
The Boeing Company
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