Effect of Temperature on MEMS Vibratory Rate Gyroscope

We report the temperature dependence of the JPL/Boeing MEMS second generation Post Resonator Gyroscopes and determine the effect of hysteresis over the range 35° C to 65° C. The results indicate a strong linear dependence of the drive frequency and sense frequency with temperature of 0.093Hz/° C and AGC bias voltage with temperature of 13mV/° C. The results also indicate a significant time lag of the gyroscope of these quantities when responding to external temperature variations but determined no hysteresis exists in the drive frequency, sense frequency, and AGC bias. Both the time-frequency and time-bias voltage relationships are of the form y = A+ B* exp(-t/T) where A is an offset parameter in Hertz and Volts respectively and B depends on the magnitude of the temperature variation.