AIP conference proceedings · 2003 · 13 citations · 0 references
EngineeringNuclear EngineeringInstrumentationMetrologyRadiation MeasurementCalibrationEquipment CalibrationMeasurement StandardsMeasurement UncertaintyRadiation InstrumentationTemperature MeasurementCalibration Of ThermometersCalibration UncertaintyCalibration Uncertainty AnalysisCalibration Uncertainty PropagationMeasurement Uncertainty In ThermometryRadiation Instrument CalibrationUncertainty Calibration
The calibration of radiation thermometers requires knowledge of the effect of target size on the thermometer output, namely the size of source effect. Measurement of an instruments size of source effect allows a correction to be applied, or an allowance to be made in the calibration uncertainty. At present no standard exists between National Metrology Institutes for how an instrument’s response to target size should be defined or measured. To determine the degree of equivalence between measurements made at different institutes transfer standard instruments were exchanged between IMGC and NPL, and their size of source effect measured. Measurements were made by the indirect method at IMGC, and by indirect and direct methods at NPL. Excellent agreement was found between measurements made using the indirect method at the two institutes.