Fiber Optic Sagnac interferometer for measuring rotational speed

摘要

The fibre-optic Sagnac interferometer for rotation rate measurement has a light source keyed ON and OFF at predetermined intervals, whereby, after filtering of the read-out signal during demodulation, a substantially lower carrier signal for the read-out signal and thereby correspondingly fewer demodulator requirements can be achieved. According to the invention, a closed-loop configuration is proposed, in conjunction with a scale factor control circuit for rotation rate sensors with light sources keyed in such a way. The invention is particularly suitable for fibre-optic rotation rate sensors with short sensor coil fibre length. …IMAGE…