In Situ Thermal Aging Calibration Corrections for High Temperature MEMS Transducer Arrays
Dynamic matrix corrections combine in situ reference tracking and Arrhenius modeling to eliminate unbudgeted high temperature MEMS recalibration cycles.
In Situ Calibration
Operational Adjustment
Metrological verification of a sensor performed while the device remains installed in its operating position ensures that the entire measurement chain is assessed under realistic conditions. Through in situ calibration, the system accounts for mounting stresses, cable impedance, and localized process conditions that laboratory testing cannot replicate. This procedure minimizes process downtime by avoiding the removal and reinstallation of sensitive instrumentation, which also prevents the risk of mechanical damage or incorrect reassembly.
Reference Signal
Introducing a transfer standard or a highly stable reference source directly to the installed sensor allows the operator to generate a known input. Comparing the sensor output to this local reference reveals any drift or offset accumulated during operation. For temperature sensors, a dry-well calibrator or an integrated fixed-point cell can serve as the local reference.
Environmental Correction
Operating conditions such as ambient humidity, background vibration, and electromagnetic interference often affect the calibration process. Active monitoring of these variables during the adjustment allows the calibration software to apply compensatory algorithms that isolate the sensor drift from environmental fluctuations.
Verification Traceability
Traceability of the calibration must be maintained by linking the transfer standard to national metrology institutes through a continuous chain of comparisons. The calibration certificate details the uncertainty budget of the in situ procedure, including the contribution of the transfer standard and the localized measurement setup.