摘要:
A gyroscopic sensor unit (101) detects a phase drift between a demodulated output signal and a demodulation signal during output of a quadrature test signal. A delay calculator (116) detects the phase drift based on changes in the demodulated output signal during application of the quadrature test signal. A delay compensation circuit (118) compensates for the phase drift by delaying the demodulation signal by the phase drift value.
摘要:
The method and apparatus in one embodiment may have: providing an axisymmetric oscillator having a beam containing two principal elastic axes and two principal damping axes; driving the beam with drive components, the drive components having forcer components that provide drive and pickoff components that provide feedback; and oscillating the beam in a normal mode and a reverse mode.
摘要:
A vibration gyroscope (10) includes a vibrator (12). The vibrator (12) has a vibration member (14) formed in a regular triangular prism shape. On side faces of the vibration member (14), three piezoelectric elements (16a, 16b, 16c) are formed, respectively. Two of the piezoelectric elements (16a, 16b) are connected to the input terminal of an oscillation circuit (20) through resistors (18a, 18b) which serve as the loads of the two piezoelectric elements (16a, 16b), respectively. The output terminal of the oscillation circuit (20) is connected to the other piezoelectric element (16c). The former piezoelectric elements (16a, 16b) are also connected to the non-inverting input terminal and the inverting input terminal of a differential amplifier circuit (22), respectively. By changing the impedances of the resistors (18a, 18b), the characteristics of the vibration gyroscope (10) is adjusted.
摘要:
An angular velocity sensor with a stable output characteristic using a sigma-delta type analog-to-digital converter comprising an integrator unit (62) for integrating electric charges output from an input switching device (44) and a digital-to-analog converter unit (48) and holding at least two integrated values, a comparator unit (63) for comparing at least the two integrated values output from the integrator unit (62) with a predetermined value, and an arithmetic operation unit (73) for operating an output signal of the comparator unit (63), the arithmetic operation unit (73) provided with a differential operation unit (70) for computing a difference between at least two comparison signals output from comparator unit (63).
摘要:
The present invention is concerned with a method of calibrating a vibrating gyroscope. The method comprises exciting a vibration along an excitation axis of a resonant structure wherein the excitation axis is positioned at a first angular position, sensing the vibration of the resonant structure on a first sensing axis of the resonant structure while the excitation axis is positioned at the first angular position, generating a first sensing signal indicative of the sensed vibration of the resonant structure on the first sensing axis, rotating the excitation axis in a continuous manner around the resonant structure to a second angular position, sensing the vibration of the resonant structure on a second sensing axis of the resonant structure while the excitation axis is positioned at the second angular position, generating a second sensing signal indicative of the sensed vibration of the resonant structure on the second sensing axis and adding the first sensing signal to the second sensing signal in order to derive a bias of the gyroscope.