The Research For Shupe Error In FOG And Octupole-winding Technology

The I-FOG is one of the most predominant and promising angle rate sensors in inertial unit's family. FOG has already been applied in many fields in western countries, but its research level is still gotten behind in China. It is the most difficult problem that the FOG with high precision has a obvious bias drift caused by temperature change or temperature grade, so its application is limited to a great extent.In this paper, influences caused by all kinds of non-reciprocal errors in fiber coil are researched at first, and it is shown that the PM fiber coil is sensitive to temperature grade is the most important reason why the bias drift is related to the temperature change or temperature grade. On the base of the research about the theory of Shupe non-reciprocal errors caused by temperature change, it shows that the bias drift caused by temperature can be restrained by using special coil winding method.Common coil winding methods are including column-winding, monopole-winding, dipole-winding and quadrupole-winding. Theoretical analysis shows that the quadrupole-winding method is the most effective one. But there are many nonideal factors in the winding procedure, the influence caused by temperature grade cannot be extinguished totally. And the fiber is longer, more obvious the residual Shupe effect is, so it is limited to improve the precision of FOG further. That is the reason why we must put forward a new fiber coil winding method to reduce the influence caused by residual Shupe effect. By comparing difficulties and operabilities of several winding method, we applied the octupole-winding method to make the fiber coil at the first time and finished a octupole coil successfully with present machine on the precondition of making sure and resolving difficulties of winding craft.In this paper, we built a testing system of fiber coil temperature performance, and we compared the temperature performance of quadrupole-winding coil to the temperature performance of octupole-winding coil by the testing system and the final testing data of the gyroscope. It is proved that the octupole-winding method is more effective and predominant to reduce the influence caused by residual Shupe effect, and this conclusion is an important base on which we can improve FOG's temperature performance futher.