Reliability Qualification
Elevated thermal stress protocol profiles shorten component aging timelines during instrument reliability qualification. Temperature accelerated testing exposes sensor assemblies to temperatures above nominal operational limits to induce thermally activated failure mechanisms. Arrhenius reaction rate models scale elevated temperature exposure duration to predict expected operational life at standard operating conditions.
Testing accelerates chemical degradation, material outgassing, and thermal expansion fatigue without changing underlying physical failure modes.
Thermal Stress
Rapid thermal cycling between upper and lower operational limits generates mechanical stress across bonded material interfaces. Mismatched thermal expansion coefficients between silicon chips, ceramic substrates, and metallic housings trigger wire bond lifting and solder joint cracking. Evaluating post-test insulation resistance and electrical continuity identifies structural assembly flaws.
Activation Energy
Calculating activation energy values for specific failure mechanisms requires testing multiple sample lots at different elevated temperature levels. Thermal activation energies quantify how failure rates accelerate under thermal stress. Validating activation energy assumptions prevents overstressing components into artificial failure modes not seen during actual field use.
Failure Screening
Environmental stress screening protocols apply thermal acceleration to production lots to weed out infant mortality defects prior to customer delivery. Thermal screening catches latent solder defects, loose mechanical hardware, and out-of-tolerance electronic components.
