Optical fiber coupled resolver having a reference signal
First Claim
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1. An optical encoder comprising:
- a movable element having a means for modulating light comprising a variably transmissive material on the movable element;
a means for alternately transmitting light through a first path which by-passes the variably transmissive material and a second path which includes the variably transmissive material.
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Abstract
An optical encoder produces a reference signal and compensates for any instability in intensity of a light source which reads the encoder. The optical encoder comprises a movable encoding element having an analog track of variable transmissivity, and a chopping element for alternately transmitting light from the source through the analog track and around the analog track. Light transmitted through the analog track comprises an information signal and light transmitted around the analog track comprises the reference signal. The chopping element comprises an optical switch or a rotatable or stationary element havnig an alternating series of opaque and transparent sections.
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Citations
22 Claims
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1. An optical encoder comprising:
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a movable element having a means for modulating light comprising a variably transmissive material on the movable element; a means for alternately transmitting light through a first path which by-passes the variably transmissive material and a second path which includes the variably transmissive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification