The fiber coil is the core component of the fiber optic gyroscope.Different winding method directly reflects the performance of the gyro.The temperature gradient varies with time will affect the transient characteristics of the fiber coil.For high accuracy fiber coil with octupole-winding method

we first study the transient effects through theoretical analysis and experimental verification respectively.Radial and axial direction temperature excitation model is built with the exist of equivalent asymmetrical length of the high accuracy fiber coil.Then we analyze the thermal nonreciprocal error angle under two different temperature excitation conditions.Next

we experimentally test the thermal nonreciprocal error angle based on the built experimental platform.According to the test result and the theoretical analysis

we can get the equivalent asymmetrical length of the high accuracy fiber coil

analyze the transient effects of high accuracy fiber coil and judge the performance

which are useful for the application of the fiber coil using in fiber optic gyroscope.