Laser angular rate sensor with dithered mirrors

Details Laser angular rate sensor with dithered mirrors Laser angular rate sensor with dithered mirrors

H - Electricity

01

S

345/10

H01S 3/083 (2006.01) G01C 19/64 (2006.01) G01C 19/70 (2006.01)

Patent

CA 1252551

ABSTRACT LASER ANGULAR RATE SENSOR WITH DITHERED MIRRORS by Graham Martin A laser angular rate sensor has four mirrors appropriately arranged at the corners of a square to reflect two oppositely directed layer beams around a closed path. Vibrators are interconnected with two adjacent mirrors for effecting oscillation perpendicular to the mirror major surface and at 180 degree phasing. The vibrator drive circuit is controlled by actual mirror displacement to tune and maintain dither amplitude at a predetermined value which preferably is 0.271 of the laser radiation wavelength corresponding to the modulation index of a zero of the zeroth order Bessel function, Jo. The vibrator drive circuit incorporates the capability for dithering when the angular rate of input to the gyro is close to zero, but switches off for other values.

464060

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