Abstract

The method of Rayleigh-Optical Frequency Domain Reflectometry (Rayleigh-OFDR) has been used to estimate, at the component level, the thermal bias drift due the elasto-optic effect into a $400\;\text{m}$ -long self-standing quadrupolar coil, under a temperature ramp ranging from $ - 20\;^\circ {\text{C}}$ to $80\;^\circ {\text{C}}$ . This estimation is performed before integration of the sensing coil in a Fiber-Optic Gyroscope (FOG). A theoretical reminder of how a thermal perturbation is creating a spurious bias in the FOG rotation rate measurement is described. Then, we propose a new methodology to estimate the thermal bias drift of the sensing coil before its assembly. It is based upon Rayleigh-OFDR. Uncertainties are characterized to assess the performances of the Rayleigh-OFDR to characterize the thermal bias drift due to elasto-optic effect in a FOG.

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