Angular Stability
Four proof masses arranged in a coplanar array neutralize linear vibration while detecting rotational velocity about a central axis. This quad symmetric gyroscope utilizes differential capacitance to reject common mode noise from high-frequency environmental oscillations. Precise phase matching between opposing oscillators allows the device to suppress quadrature error that typically degrades bias stability in inertial sensing applications.
Calibration Methodology
Measurement of the zero-rate output occurs at a static reference position after temperature stabilization of the sensor housing. Technicians apply a known rate from a rate table to determine the scale factor by comparing the voltage output against the input angular velocity. Nonlinearity manifests when the output deviates from the expected linear progression across the full input range.
Interference Sensitivity
Mechanical stress on the mounting substrate alters the symmetry of the four resonant structures and causes a shift in the resonant frequency. Thermal gradients across the silicon die introduce an asymmetric bias drift that exceeds the specified performance limits for navigational grade components. Protection from package stress through flexible interconnections prevents the transfer of environmental loads into the sensitive sensing elements.
Measurement Verification
Signal conditioning circuits convert the small displacement of the proof masses into a digital output stream that represents the measured angular velocity. Internal feedback loops maintain constant oscillation amplitude despite variations in air pressure or gas damping effects within the hermetically sealed cavity. Periodic self-test routines trigger internal electrostatic forces to confirm the operational integrity of the sensing masses without external mechanical stimulus.
