Stability Deviation
Output variations in the zero point of a sensor occur when the device is subjected to changing directional forces or acceleration cycles. This dynamic bias hysteresis manifests as a failure of the output to return to its original value after the removal of a load. The boundary for this phenomenon is defined by the maximum rated acceleration of the sensing element.
Material Memory
Molecular changes in the substrate or the bonding agent cause the sensing element to retain a portion of the previous strain. When the acceleration drops to zero, the dynamic bias hysteresis prevents the internal circuitry from reaching a true null state immediately. This lag is a function of both the peak magnitude of the event and the duration of the stress.
Environmental Impact
Thermal gradients across the sensor package influence the severity of the recovery delay. A sensor operating in a high vibration environment will show more dynamic bias hysteresis than one in a static mounting. Engineers minimize this by selecting materials with low thermal expansion coefficients and high elastic limits.
This selection process reduces the likelihood of permanent deformation at the microscopic level.
Measurement Reliability
Accuracy depends on the recovery time.
