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Emissivity measurements of opaque gray bodies up to 2000 °C by a dual-frequency pyrometer

EngineeringThermographyPhysicsThermal SensingOptical PropertiesCalibrationSpectroscopyTemperature MeasurementApplied PhysicsOpaque Gray BodiesEmissivity MeasurementsNatural SciencesRadiative AbsorptionInstrumentationDual-frequency PyrometerThermal SensorThermal RadiationEmissivity