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EOI uses one of two high emissivity coatings on the surface
of it's blackbodies.
When considering the effective emissivity performance of any blackbody, one must
consider the surface emissivity, the geometry of the blackbody and the view angle of the
device under test. Please review EOI's Emissivity
Primer for more information.
The EOI mid-temperature coating is
used on both cavity and flat plate blackbodies that have a maximum operating temperatures
of up to 210 °C. It is essentially constant over the temperature range of interest.
The EOI high-temperature coating is
used on both cavity and flat plate blackbodies that have a maximum operating temperatures
of up to 1400 °C. Although it has significant variability at lower temperatures, it has
excellent performance at the higher temperatures where it is intended to operate.
To ensure maximum performance, EOI
recommends a re-coating of the emissive surface as a part of each blackbody calibration. A
re-coating included when the calibration is performed by EOI.
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