Patent ID: 11906603
Assignee: SHANGHAI UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The system for measuring a magnetorefractive effect of an optical fiber according to claim 1, wherein the data acquisition and processing module (8) comprises signal generators (8-1, 8-2), frequency mixers (8-3, 8-4), low-pass filters (8-5, 8-6), differentiators (8-7, 8-8), multipliers (8-9, 8-10), a subtracter (8-11), an integrator (8-12) and a band-pass filter (8-13); the signal generators (8-1, 8-2) are used for generating fundamental frequency carrier signals and frequency doubling carrier signals; the number of the frequency mixers (8-3, 8-4), the number of the low-pass filters (8-5, 8-6), the number of the differentiators (8-7, 8-8) and the number of the multipliers (8-9, 8-10) are respectively two; and the cut-off frequency of the low-pass filters (8-5, 8-6) is between the magnetic field signal frequency and the carrier frequency.