Fiber optic gyro system using sample and hold units for wide angle accomodation

Abstract From the Canadian patent

In a digital phase ramp type fiber optic gyro in which a digital biasing signal produced by a biasing signal generator is added to a digital ramp signal and the added output is converted by a D/A converter to an analog signal and is applied to an optical phase modulator to thereby cancel a Sagnac phase difference of right-handed light and left-handed light propagating through a looped optical transmission line and provide +.pi./2 rad. and -.pi./2 rad. bias phase differences alternately with each other, a first error signal corresponding to the difference between the outputs of an opto-electric converter when the +.pi./2 rad. and -.pi./2 rad. phase differences are provided respectively, is …