G - Physics – 01 – D
Patent
G - Physics
01
D
340/136.1
G01D 5/34 (2006.01) G01B 11/26 (2006.01)
Patent
CA 1057380
A B S T R A C T An optical transducer in an avionics system which in- cludes a compass card for indicating aircraft heading has a disc with a cam surface thereon that is rotated by a shaft connected compass card. When a pilot rotates the heading select indicator associated with the compass card to a new heading, the cam sur- face pivots a shutter in an appropriate direction. A pair of photoresistors are located in a bridge circuit and are equally illuminated by a corresponding light source when the heading select indicator and the aircraft lubber line coincide thereby effecting a predetermined output from the bridge circuit. Shut- ter movement, due to a heading or course change, causes either one or the other of the two resistors to have a more or less light impinging thereon thereby producing a bridge error signal. The error signal output may then be used by a flight director or auto pilot to maneuver the aircraft to the newly selected head- ing. Once the heading select indicator and the aircraft lubber line are aligned, the shutter is re-located so that the photo- resistors are again in balance and no error signal output ema- nates from the bridge circuit.
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