使用滤波器和探测器阵列的光纤陀螺光源平均波长漂移监测

In order to improve the scale factor stability of the fiber optic gyroscope (FOG) within the operating temperature range, a light source mean-wavelength shift monitoring scheme based on filter-detector array is proposed. The light source spectrum in FOG is usually a smooth Gaussian-like function, whose integral value can be theoretically estimated with the help of a few sampling points with in small error range. Therefore, the average wavelength shift of the light source can be calculated by measuring the intensity of the light source at several specific wavelengths combining with using an appropriate numerical integration algorithm. Taking the left peak of the erbium-doped fiber super fluorescent source (the central wave-length is about 1530nm) as an example, the influences of filter parameters and integration method on the monitoring accuracy are analyzed, which show that the difference between the calculated wave-length shift and the actual one could be smaller than 0.2×10^-6 by the proposed Gauss-Legendre integration method when the primary and the secondary filter band widths are 5 nm and 1 nm, respectively. These real-time monitoring results can be used for wavelength feedback control and scale factor compensation to further improve the FOG's environmental adaptability.