| 摘要 |
In order to stabilize the scale factor and the loop gain of the control loop of a fiber-optic Sagnac interferometer, having phase resetting, for rotational speed measurement, a method and a digital evaluation circuit are proposed, which in addition to the control loop for the readjustment of a phase modulator (P) has two auxiliary control loops for the nominal value of the gain of the scale factor control, on the one hand, and for the stabilization of the loop gain of the primary control loop, on the other hand. The evaluation circuit can be realized as an ASIC, and in conjunction with optimization of the control bandwidth avoids high complexity in the circuit subassemblies for generating modulation and demodulation signals and the control signals for the scale factor control loop.
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