Importance of Fiber Optic Temperature Sensors in EV Thermal Management
The traditional sensors such as thermocouples are quite slow, and they deliver inaccurate results, especially when installed at high voltages. These sensors also pose a serious risk of short circuit or electrocution if not being isolated properly.

Fiber optic temperature sensing technology overcomes the challenges of conventional temperature sensors (thermocouples). The following feature of FO temperature sensors make them ideal for EV prototype testing:

Highly Di-electric, Safer to be used in High Voltage environment
No need for complex isolation and lengthy calibration/compensation
Ultra-small size (up to 0.4mm) to fit into Power Module and Battery cells
High accuracy, ±0.2⁰C with 100% repeatability
High Response time <40ms
Robust and easy to route cabling
The fiber optic temperature sensors are being used by EV design, instrumentation, and test engineering in the following applications:
Traction Motor Testing: Stator winding hot spot, Rotor temperature, HV Terminals temperature measurement.
Power Electronics Testing: Junction Temperature (IGBT, Diode), Capacitor Core Temperature, and HV Terminals temperature testing
EV Battery: Cell Core/Anode thermal profiling, Intercell temperature, Battery Pack Hot Spot, HV Terminals temperature, Cooling thermal profiling, Battery Abuse Testing etc.