Methods for Studying Temperature Characteristics of a FOG Sensing Coil

Abstract

Environment temperature is one of the causes of fiber-optic gyroscope (FOG) error. Particularly, temperature influence on the sensing coil produces angular velocity error, which is proportional to the spatial and temporal temperature gradients. To calculate this error, temperature sensors can be set on the body of the coil or directly onto the fiber [1]. However, with the increase of temperature change rate the time of temperature detection becomes the bottleneck: the shift between FOG data and temperature data might decrease the effectiveness of the error compensation algorithm. The temperature sensors also cannot be mounted over the fiber since it increases mechanical impact on sensing coil leading to the errors during vibrations. The delay between temperature registration and FOG's reaction to temperature change might be calculated with optimization methods [2]. However, the challenge is to set these methods so that it could avoid the local minima problem. The paper aims to provide a review of temperature measurement methods of the sensing coil to define heat transfer delays.