Meaning
Systematic measurement procedure defines the relationship between temperature changes and optical signal shifts in fiber optic sensors. Through thermo-optic calibration, engineers establish the coefficient needed to convert wavelength shifts into precise temperature readings. The process is a required step before embedding optical sensors into battery cells for diagnostic testing.
This calibration ensures that thermal measurements are accurate to a fraction of a degree.
Calibration Method
The process involves placing the sensor-equipped fiber in a temperature-controlled chamber and stepping through a known temperature range. At each step, the system records the corresponding shift in the reflected light wavelength. This data is used to calculate the thermo-optic coefficient of the fiber.
This coefficient is unique to each fiber type and coating material.
Measurement Accuracy
Precise calibration is essential because the fiber also responds to mechanical strain during battery cycling. Understanding the pure thermal response allows engineers to isolate the strain component from the thermal signal. This separation is critical for accurately mapping internal cell pressure and expansion.
It leads to more reliable diagnostic data.
Project Sourcing
Sourcing managers must ensure that cell development programs include this calibration phase for all fiber optic diagnostics. Choosing suppliers that use calibrated sensors ensures that the resulting thermal data is defensible. This accuracy is crucial for validating the safety margins of new pack designs.
It supports a more rigorous product development process.
