Input / output signal processing device of optical fiber gyroscope

摘要

In the present invention, the time required for light to pass through the optical fiber 6 T and the amplitude of which is a bias input with a signal P2 for causing a phase difference of | P during the time (T) to be a bias input, wherein the signal P2 has a period of | P A comparator 61 for comparing a reference value VREF set equal to the output value P3 of the optical fiber 6 when input at the phase of the optical fiber 6 with the output of the optical fiber 6; A coefficient circuit (70) for counting the time the output of the comparator (61) remains in the logic low and high states; A flip-flop FF1 for storing the output of the comparator 61; A latch circuit 80 for latching the count values of the logic low and high states of the counting circuit 70 in synchronization with the output of the flip-flop FF1; And a subtraction circuit 90 for outputting the difference between the count values of the low and high states of the latch circuit 80 as an error signal.;Therefore, the present invention can accurately detect the phase change amount of the optical fiber without using a separate analog / digital converter, thereby saving manufacturing costs and improving the linearity of phase change detection.