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How Fiber Optic Temperature Sensor Works PowerPoint Presentation
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How Fiber Optic Temperature Sensor Works

How Fiber Optic Temperature Sensor Works

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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