Temperature drift cancel manner and hole warping measuring device null

摘要

PURPOSE: To eliminate the influence of gyroscope due to temperature drift by mounting two gyroscopes in mutually opposite directions and then calculating the angle of rotation only when difference obtained by subtracting an initial value from the measured value of each gyroscope has a different sign. ;CONSTITUTION: Two piezoelectric vibration gyroscopes A and B with similar temperature characteristics are mounted in mutually opposite directions on the same axis. First, the initial values of the gyroscopes A and B in stop state are recorded. Measurement is started and then ΔAi and ΔBi obtained by subtracting the initial value from raw data obtained at specific measuring points are recorded. When the signs of ΔAi and ΔBi differ, an average value Δy of the differences between ΔBi and ΔAi is obtained, the value Δy is integrated in terms of time, the angle of rotation is calculated, and then the result is recorded. When the signs of ΔAi and ΔBi are equal, it is judged that the output change at this time is the change due to temperature drift rather than rotation and no integral calculation is performed to obtain the angle of rotation. A similar data processing is performed after moving to the next measuring point..;COPYRIGHT: (C)1994,JPO