Device for digitally processing information obtained from a gyrolaser and associated gyrolaser

A gyrolaser with optical cavity, comprising:

• a plurality of mirrors,
• at least one photo-detector delivering two optical signals in phase quadrature, said signals being digitized,
• means for controlling a position of one of said mirrors by conversion of an electrical signal into a mechanical force,
• means for activating said gyrolaser in an oscillatory movement by conversion of an oscillation electrical signal into the mechanical force,
• means for measuring an angular velocity of said gyrolaser,
• means for extracting a phase α and a modulus ρ or a square of the modulus ρ of a vector whose real part is formed by one of the two digitized signals and an imaginary part is formed by the other digitized signal, said modulus ρ representing an amplitude of said optical signals and its square representing their power,
• means for locking a length of the optical cavity onto a multiple of a wavelength of said optical signals by an estimation of a slope of a curve of variation of the amplitude or of the power as a function of time, said means producing a correction signal determined as a function of said slope and applied to said control means,
• a derivator applied to the phase a over a given period of time in order to produce a signal comprising an overall movement information, including an oscillatory movement, for said gyrolaser, and
• means for locking an activation of said gyrolaser onto said oscillatory movement, receiving said signal, extracting from which an estimation of the oscillatory movement imparted on said gyrolaser by said activation means and producing said oscillation signal whose amplitude is locked onto a given amplitude setpoint.