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How Fiber Optic Temperature Sensor Works

In other words the fiber is directly affected by the measurand in an intrinsic sensor compared to an extrinsic fiber where the fiber simply guides the light to or from the sensing element.

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How Fiber Optic Temperature Sensor Works

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  1. Fiber Optic Temperature MeasurementTechnology OPERATINGPRINCIPLE • Based on a well known and reproduciblephenomenon • The band-gap variation in the absorption spectrum of the semiconductor GaAs (Gallium Arsenide) with respect totemperature • GaAs can also be looked at as a variable optical filter (lowpass) • Wavelengths towards visible are blocked • Wavelengths towards infrared are transmitted • A Direct Contact temperaturesensor • GaAs material properties will never change with time, ever! • NoDRIFT… • No RECALIBRATION… 100% 0% Visible Infrared

  2. Fiber Optic Temperature MeasurementTechnology • SYSTEMDESIGN • The System consistsof FIBER OPTIC TEMPERATURESYSTEM • Lightsource • Optical coupler • RuggedSpectrometer • Electronics for Data Processing, Storage & Visualization WhileLight Source GaAs Sensor • An optical fiber delivers white light to the semiconductor GaAs sensor glued at the ProbeTip • Some of the light is absorbed – Depending on the temperature of the GaAs Crystal at the ProbeTip • The light is reflected by a dielectric mirror and returns through the same fiber for analysis by the on-board Spectrometer • Highly reliable monitors suited to automotive environments Fiber OpticProbe Optical Coupler Spectrometer Dielectric Mirror FiberCladding Coating Injected Light Reflected Light GaAsCrystal (Sensor) Fiber Core

  3. Fiber Optic Sensors: Immunity toEnvironments Highvoltage: Greater than1200kV Radiation:Nuclear RadioFrequency (100kHzupto10MHz) Magnetic Field:Greater than 25Tesla Chemicals: AllpHlevels(0–14) Vibration: 10g+Force Microwave (300MHz to300GHz) Bio Safe: SterileEnvironments • No Need for Isolation: Highly dielectric strength • Avoid complex compensation and Calibration: Immune toNoise • Ultra Fast Response: Accurate ThermalProfiling • Smaller Size and Intrinsically Safe: Easy to use and handleSensors • Explosion Proof: Suitable for ExplosiveEnvironments

  4. Benefits of Fiber Optic Sensors over TraditionalSensors • Electric vehicles are going to 1000V+, 700A+ for cars and 2400V+, 1000A+ fortrucks • Traditional thermocouplesare too slow and significant limitation above200V • Thermocouple output is in millivolts and gets affected by Electric and Magneticfields • Safety Risk from Thermocouples: Risk of short circuit at higher voltages, Corrosionetc. • Thermocouples are Non-Linear: Sensors are non-linear, require complexcompensation • Thermocouples are large: not suitable to fit into tiny spaces on PCBs, Power Electronics, ChargingPoints • Slower Response: Thermocouples are not fast enough for accurate thermalprofiling • Variation from Batch to Batch: Impact accuracy and repeatability oftesting • Susceptible to High Voltage and MagneticFields • Thermocouples are not suitable for ExplosiveEnvironments • Thermocouples are not suitable with longer signalcables

  5. Fiber Optic Temperature Sensors:applications • Transformer Winding Hot SpotMonitoring • Switchgear TemperatureMonitoring • Motor Winding TemperatureMonitoring • Cable TerminationTemperature • MicrowaveHeating • MicrowaveDigestion • MicrowaveAblation • RF / MicrowaveDrying • FoodPackaging • Soildecontamination RF /Microwave Energy/Utilities • EVMotors • EV BatteryCells • EV BatteryModule • EV BatteryPack • PowerElectronics • ChargingEquipment Application forFiber Optic Temperature Sensors • GlassManufacturing • Process andControl • MiningApplications E-Mobility Industrial • MRI Machines /Coils • Sensor forCatheters • CT scan, PATscan • ClinicalTrails • CancerTreatment • CryogenicResearch • PharmaceuticalResearch • Consumer ProductResearch • EnvironmentalResearch ResearchLab Medical 5

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