Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-09-02
1990-03-13
Gonzalez, Frank
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250229, G01D 534
Patent
active
049085107
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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Huggins Raymond W.
Miller Glen E.
Gonzalez Frank
The Boeing Company
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