Patent ID: 9518825
Filing Date: 2016-12-13
CPC Classification: G01C

Claim Text:
1. Rotation rate sensor with a fiber-optic Sagnac interferometer wherein the fiber-optic Sagnac interferometer comprises: a light source, a polarizer, a fiber coil, a photo detector device, an amplifier with a downstream connected analog/digital converter, a digital/analog converter, an evaluation circuit, and a phase modulator, and wherein two light beams coming from the light source, being polarized by the polarizer and generated by a beam splitting are injectible in the fiber coil in directions opposite to each other and are subsequently recombinable and wherein the two light beams can be modulated by the phase modulator arranged in the fiber coil, and wherein the photo detector device is exposible to the interference signal generated by the recombination of the light beams, wherein a signal corresponding to a light intensity of the interference signal is deliverable by the photo detector device, which is to be fed to the amplifier with the downstream connected analog/digital converter, whose output signals are processible by the evaluation circuit, and wherein a main control loop of the evaluation circuit is configured to produce a digital phase reset signal and to deliver the digital phase reset signal to the digital/analog converter for production of a reset signal to be fed to the phase modulator, wherein the main control loop comprises a multi-functional integrated optical chip with a MIOC transfer function, characterized in that, a digital filter is connected upstream to the multi-functional integrated optical chip, whose filter transfer function corresponds to the inverse MIOC transfer function such that the MIOC transfer function is compensatible by the filter transfer function, the fiber-optic Sagnac interferometer further comprising: an adjustment unit for adjusting of coefficients of the filter transfer function, and a coefficient calculation unit for providing the coefficients to the adjustment unit, wherein by the coefficient calculation: