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

Claim 1:
2. 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 first periodic phase difference ΔΦΠ(t) has a modulation frequency equal to the eigen frequency fp and wherein
the second periodic phase difference ΔΦalpha(t) and the third periodic phase difference ΔΦbeta(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 ΔΦalpha(t) being synchronized with the first periodic phase difference ΔΦΠ(t),
the third periodic phase difference ΔΦbeta(t) being in phase quadrature with respect to the second periodic phase difference ΔΦa (t).