Remote Fiber Optic Angular-Orientation Sensor Using Phase Detection of Two Orthogonal Oscillating Polarization Vectors

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Author
Hofler, Thomas
Brininstool, Michael R.
Newmaster, Jeffrey T.
Garrett, Steven L.
Date
1990-09-18Metadata
Show full item recordAbstract
A method for remotely detecting the angular position of
a rotatable code wheel is provided by generating two
sine wave modulated light beams which are orthogonally
polarized with respect to each other. The beams
are combined and then directed through a polarization
filter mounted on the code wheel. The combined beam
incurs a phase shift with respect to a reference signal
which depends upon the position of the code wheel.
The combined polarized beam provides angular position
resolution between zero and ninety degrees, but
lacks quadrant resolution. Two other light beams are
directed to a two channel digital mask pattern imprinted
on the code wheel. The mask pattern encodes these
latter beams with "on" or "off' pulses to provide quadrant
resolution. The beams are converted to digital
electric signals which are received by a programmable
read oly memory (PROM). The PROM provides an
output corresponding to the angular position of the
code wheel to a display.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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