KEYWORDS: Fiber optic gyroscopes, Resistance, Diodes, Light sources, Control systems, Process control, Temperature metrology, Semiconductors, Automatic control, Control systems design
Aim at the obvious dependence on the differential parameter of Super-luminescent diode (SLD), the theoretical and experimental investigation of the SLD transfer function and corresponding control parameters have been done. Results indicate that, i) the transfer function between temperature of radiation chip and electric current of TEC has a time delay, which comes from the distance between thermistor resistance and radiation chip; ii) the further of the distance between thermistor resistance and radiation chip, the longer of the time delay, which more obvious dependence on the differential parameter; iii) through optimizing the differential parameter, high control precision could be achieved for all SLDs produced by different factories, which distance between thermistor resistance and radiation chip is much different. Above results could help to understand the source of the time delay and the function of differential parameter in the temperature control process of SLD.
Using matrix optics and optical propagation theory, a model for bias errors of an optical fiber gyroscope (FOG) caused by the spherical nonuniform distribute magnetic field has been deduced. Based on the above model, the effect on the FOG caused by the nonuniform distribute magnetic field and common circuit board is also analyzed. Results indicate that, i) the nearer of distance between the center of magnetic field and the fiber loop, the bigger of the bias errors of FOG will be; ii) relationship between bias and magnetic field direction is a inclined sine; iii) outside of the loop, the bigger of the height H0, the smaller of the bias error will be; iv) inside of the loop, the bias error is independent on the height H0; v) the common circuit board which radiate intensity is very weak can also cause unstable and direction related of the FOG’s output. Abolve conclusions may be useful for understanding the effect of actual magnetic field.
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