The express test of winding symmetry quality in fog fiber coils

Abstract

In this paper, the express test feasibility of the fiber optic gyroscope (FOG) coil winding symmetry quality using periodic variation temperature excitation is confirmed in theory by using the 3D fiber coil model that we proposed early. Then experiments are conducted to see how a FOG coil responds to periodic variation temperature excitation when its symmetry properties are purposely changed, which successfully verify the effectiveness of the express test for inspecting the winding symmetry quality of a fiber coil. The equivalent asymmetry degree (EAD) is introduced to quantify the winding symmetry quality of fiber coils. The multiple EAD measuring results, obtained with the express test and the old method using the constant temperature shock excitation that we proposed early, are compared. As anticipated, the EAD measurement repeatability of the express test is much better than that of the old method. In addition, the express test just needs 20 min for measuring the winding symmetry quality instead of one hour in the old method. Therefore, it is much easier to use the express test to obtain more accurate fiber coil winding symmetry measurements than to use the old method.