Detection method for the singular angular velocity intervals of the interferometric fiber optic gyroscope scale factor

The scale factor is an important parameter used to characterize a fiber optic gyroscope. A scale factor test was performed on the B-215 closed-loop interferometric fiber optic gyroscope and the scale factor was observed to change considerably in some angular velocity intervals, which are defined as singular angular velocity intervals. To determine the singular angular velocity intervals accurately, we implemented the free-pendulum experiment and proposed a new method based on the Daubechies wavelet transform to detect the intervals. The results show that the method can calculate the singular angular velocity intervals efficiently and accurately, and the detection results are consistent with the scale factor test results at discrete angular velocity points. Moreover, the free-pendulum signal reflects the changes of the scale factor in detail. Therefore, this study further improves the scale factor test method by using the following approach: in addition to the scale factor test at discrete angular velocity points, it is necessary to implement the free-pendulum experiment to determine whether singular angular velocity intervals exist.