Thermal Test
Environmental testing procedures subject sensor assemblies to controlled ramp rates of thermal variation inside specialized environmental test chambers. The dynamic rate of change temperature sweep evaluates sensor calibration stability under transient non-isothermal operating conditions.
Transient Response
Fiber optic sensing systems experience signal errors when internal thermal gradients disrupt structural equilibrium. During a dynamic rate of change temperature sweep, the optical fiber core temperature lags behind the external enclosure temperature due to thermal mass and conductive resistance. Optical phase output exhibits dynamic errors proportional to the applied temperature ramp rate in degrees Celsius per minute.
Equilibrium thermal models fail to predict sensor behavior during rapid thermal transients.
Calibration Hysteresis
Transient thermal stress induces physical strain hysteresis in potting compounds and protective coatings. Mechanical thermal mismatch between glass fibers, metallic housings and adhesives creates transient strain offsets during heating cycles that differ from cooling cycles.
Acceptance Criteria
Sourcing specifications limit allowable transient measurement error across defined ramp rates ranging from one to ten degrees Celsius per minute. Qualification protocols require executing the dynamic rate of change temperature sweep across the full specified operating temperature range. Sensors passing the test maintain output calibration within certified accuracy limits throughout the thermal ramp cycle.
Calibration certificates state maximum transient error under specified thermal ramp rates.
