Substrate stress relaxation drives long-term zero drift in encapsulated MEMS pressure sensors through viscoelastic shear in packaging adhesives over time.
Wafer trim establishes initial sensor accuracy classes, but package stress and thermal drift determine field performance and calibration costs.
Silicon pressure transducer calibration under humidity excursions requires multi-plateau RH dwells to decouple water absorption strain from pressure signals.
Dynamic atmospheric humidity alters gel swelling stress and dielectric passivation properties in piezoresistive sensors, driving measurable zero baseline drift.
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