基于波长控制的光纤陀螺标度因数温度性能提高方法

Temperature Performance Improvement Method for Fiber Optic Gyroscope Based on Wavelength Control

光纤陀螺的标度因数与光纤环的长度、直径及光源的平均波长有关。在温度条件下,光纤环的长度、直径及光源的平均波长均会发生变化,进而导致光纤陀螺在高低温下的标度因数不同,影响温度环境下的光纤陀螺标度因数的重复性。提出了一种基于光纤陀螺波长控制的标度因数温度性能提高方法,该方法在光源驱动电路的桥式回路中增加了铂电阻组件,从而可自动调节光纤陀螺光源的管芯温度,进而控制光源平均波长的变化,以抵消光纤环有效面积因温度变化而对标度因数产生的影响,提高温度环境下光纤陀螺的标度因数重复性。试验表明,该方法将未补偿情况下光纤陀螺全温范围内的标度因数重复性(1σ)由271×10^(-6)～280×10^(-6)减小到了32.5×10^(-6)～43.5×10^(-6),标度因数重复性误差减小了84%～88%,并验证了该方法的有效性。

The scale factor of fiber optic gyroscope(FOG) is related to the length, the diameter of the fiber coil and the average wavelength of the light source. Under the temperature conditions, the length, the diameter and the average wavelength will change, which will lead to different scale factors of FOG at the full temperature range, and affects the repeatability of FOG scale factor in temperature environment. In this paper, a method to improve the temperature performance of the scale factor based on the wavelength control of FOG is presented. This method adds Platinum resistance components to the bridge circuit of the optical source driving circuit. The light source core temperature of the FOG is automatically adjusted by the designed Platinum resistance components, and then the average wavelength of the light source is controlled to offset the scale factor of the effective area of the fiber coil changing with temperature. The scale factor repeatability of FOGG under temperature environment is improved. Experiments show that this method reduces the scale factor repeatability(1σ)from 271×10^-6 ~280×10^-6 to 32. 5×10^-6~43. 5×10^-6 at the full temperature range without compensation, and the scale factor repeatability error is reduced by 84%~ 88%the effectiveness of this method is verified.