Rectification Error
Low-frequency acceleration measurement errors arise when high-frequency oscillatory inputs interact with structural and electronic non-linearities in precision inertial transducers. Dynamic vibration testing quantifies vibration induced bias drift by measuring shifts in steady-state zero-g output during single-axis and multi-axis shaker table sweeps. Sourcing specifications establish maximum allowable drift coefficients expressed in micro-g per g-squared across specified environmental vibration spectrums.
Dynamic Offset
Asymmetric spring stiffness, non-linear gas squeeze-film damping and carrier demodulation phase errors transform high-frequency acceleration inputs into uncompensated DC offset shifts. In sensitive accelerometers exposed to harsh dynamic environments, vibration induced bias drift accumulates over integration time, introducing systematic position and velocity errors in downstream inertial navigation units. Test facilities evaluate this vulnerability by mounting sensors on electrodynamic shakers, applying controlled sinusoidal or random vibration profiles across frequency bands from twenty hertz to two kilohertz, and measuring output offset variations relative to unexcited baseline conditions.
Digital signal processing filters and mechanical isolation mounts reduce these energy conversion mechanisms during system assembly.
Filtering Mitigation
Symmetrical physical suspension design and balanced differential sense electronics reduce even-order non-linear terms responsible for dynamic rectifying shifts. Monitoring vibration induced bias drift during environmental stress screening identifies assembly defects, structural asymmetry and micro-crack formations in silicon flexures. Calibration records log rectification sensitivity factors across temperature profiles to optimize digital compensation algorithms.
Vibration Bound
Acceleration amplitudes exceeding structural linear displacement limits induce severe mechanical clipping and unrecoverable offset errors. Beyond these vibration bounds, vibration induced bias drift degrades sensor scale factor accuracy and invalidates linear error propagation models. Qualification certificates document maximum linear g-range limits and certified operational vibration envelopes for critical mission hardware.
