PHASE CHARACTERISTIC STABILIZATION OF THE FIBER-OPTICAL SENSOR SIGNAL IN TERMS OF TEMPERATURE CHANGE

Software simulation of the phase characteristic of fiber-optical gyroscope in Matlab has been done. The mechanism of the fiber optic gyroscope phase characteristic distortion has been described. It includes a speed change of reaching the normal operating mode, which in turn may be caused by changes in the optical power when the ambient temperature is changed. The search and theoretical analysis of existing methods of stabilization phase characteristic has been carried out (using infinite impulse response filter and software control of photo detector gain). As a result of this analysis it is revealed that the available methods don’t solve this problem because they don’t eliminate the root cause of the fiber optic gyroscope phase characteristic distortion. A new method for signal phase stabilizing in the fiber-optical sensor has been devised. The method is based on the imposition of the normalization differences for ADC readings carrying useful speed signal. The experimental study of delays in the BIM-3 device with temperature ranging from 25 to 29 °C has been carried out. Research results showed a decrease in the maximum amount of delay fourfold and reduce the range of delay variation from 280 to 7 ms with the imposition of normalization.