Patent ID: 11885622
Assignee: EXAIL
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The fiber-optic loop or in-line interferometer according to claim 1, wherein:
the period of modulation T is equal to the double of the propagation time difference Φτ, the third periodic phase difference ΔΦbeta(t) having a modulation frequency equal to the eigen frequency fp and wherein
the first periodic phase difference ΔΦΠ(t) and the second periodic phase difference ΔΦalpha(t) have a same modulation frequency equal to an odd multiple (2N+1) of the eigen frequency fp, where N is a non-zero natural integer,
the second periodic phase difference being in phase quadrature with respect to the first periodic phase difference,
the third periodic phase difference ΔΦbeta(t) being synchronized with the first periodic phase difference or with the second periodic phase difference.