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.
Silicon Carbide Transducers
Semiconductor Substrate
Microelectronic sensing elements fabricated from wide-bandgap materials operate effectively in environments that would destroy conventional silicon-based devices. High-temperature and high-pressure sensors utilizing silicon carbide transducers leverage the wide bandgap and high thermal conductivity of the material to maintain structural and electrical integrity. This material choice enables direct measurement in extreme settings such as turbine exhausts or deep-well drilling shafts.
Thermal Durability
The wide bandgap of three electron volts allows these devices to function at temperatures exceeding five hundred degrees Celsius without suffering from excessive thermal carrier generation or leakage currents. In contrast, standard silicon transducers fail as the material becomes intrinsic and loses its semiconducting properties at high temperatures.
Pressure Output
Piezoresistive sensing structures etched directly onto the carbide substrate deliver a linear electrical response to mechanical deformation. The gauge factor of these piezoresistive elements remains stable over a broad temperature range, which simplifies the compensation of the resulting output signal.
Metrological Stability
Calibration of the high-temperature transducer requires specialized reference chambers that can sustain extreme heat while applying precise pressure. Longitudinal drift tests confirm that the drift rate of the carbide-based elements is significantly lower than that of alternative refractory metal systems under continuous exposure to oxidizing atmospheres.