Home » Introduction of Black Body Sources (Infrared Calibration)
This overview covers dedicated black body sources for low uncertainty calibration of infrared thermometers. A range of portable primary black body sources combines high emissivity with excellent temperature uniformity. The cylindrical design minimises the effects of air movement and environmental changes. Many of the sources can be used with high purity ITS-90 Fixed Point Cells where the thermometer is calibrated against the freezing temperature of a pure metal.
A black body is defined as a source with no reflectivity or a source emitting the maximum possible radiation (at all wavelengths) for its temperature.
Emissivity is the ratio of the radiation emitted by a surface to that of a black body at the same temperature. Isotech has a range of sources with high emissivity combined with thermal uniformity for use as primary standard sources for low uncertainty calibration.
The temperature source has excellent emissivity with sufficient uniformity to allow the test thermometer to be compared to a traceable contact thermometer.
In this method the black body is calibrated with a standard thermometer and the test thermometer is compared to the source.
In this method the test thermometer is compared with a standard radiation thermometer.
The test thermometer is calibrated, not against a source or other thermometer, but against a fixed temperature point of an ITS-90 Fixed Point Cell. Such a point is obtained for example by melting a quantity of pure Gallium to obtain a fixed temperature of 29.7646°C
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