Transient Thermal Calibration in Quartz Resonant Accelerometers
Transient thermal calibration compensates quartz resonant accelerometer bias shifts caused by temperature gradients using differential thermal rate models.
Scale Factor Shift
Error Metric
Sensor calibration monitoring tracks the stability of the relationship between the physical input and the electrical output over time. The scale factor shift measures the percentage change in sensor sensitivity from its initial calibrated value. This error causes proportional measurement deviations that increase with the magnitude of the measured input, unlike zero-point bias errors which remain constant.
It is a critical performance parameter for accelerometers, gyroscopes, and pressure transducers.
Environmental Cause
Thermal stress and mechanical aging of the sensor structure are the primary drivers of this sensitivity drift. In many devices, the scale factor shift occurs because of changes in the stiffness of the sensing elements or the strength of internal magnetic fields. These changes can be caused by exposure to extreme temperatures, mechanical shock, or long-term storage.
Understanding these effects is necessary for designing robust instrumentation.
Calibration Check
Regular recalibration against a known laboratory reference allows technicians to detect and correct this drift. This procedure involves applying a series of precise inputs and calculating the new slope of the sensor response.
Mitigation Circuit
Electronic correction using internal temperature sensors can also compensate for this error in real time. This compensation algorithm adjusts the digitizer output to maintain a constant sensitivity across the specified operating temperature.