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Description:
- Measures total hemispherical emittance of surfaces and
coatings by suspending 1-in.-diameter sample in thermal vacuum chamber.
- 1-kW light exterior to vacuum chamber provides sample heat
.
- LN2-cooled inner cold chamber provides
heat sink.
- Temperature monitored versus time via PC-Based data
acquisition system.
- Functional emittance calculated based on sample area,
mass,
and heat capacity.
![[horizontal rule]](rule.gif)
Features:
- Inner (heat sink) chamber LN2 cooled.
- Turbomolecular pumped.
- 1-kW light source outfitted with collimating optics and
variable intensity control.
- Sample temperature history collected with PC-based data
acquisition that uses programmable thermometer with IEEE-488 interface.
Research Projects:
- Obtains total hemispherical emittance of new surfaces,
materials, paints, and coatings.
![[horizontal rule]](file:///W:/epbranch/OpticalProps/rule.gif)
Potential Uses:
- Calibrating light-source intensity to obtain measurement of
surface absorptance and total hemispherical emittance.
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![[horizontal rule]](file:///W:/epbranch/images/rule.gif){kind=small}