Emissometer is a special purpose instrument to measure the emittance of absorber coatings used for the flat plate solar thermal collector, wherein the maximum working temperature of the collector is in the range of 80-85°C. The emissometer is heated to 82 °C, so that the sample to be measured need not be heated. At 82°C, the spectral range of the thermal radiation emitted from the surface is in the range of 3-30 mm. The detector in the emissometer consists of a differential thermopile with low and high emittance areas, which ensures near constant response to the emitted radiation in this wavelength range.
MAKE AND MODEL: DEVICES AND SERVICES AE EMISSOMETER
READOUT: D&S Scaling Digital Voltmeter
WAVELENGTH RANGE: 3 – 30 µm
DETECTORS: Radiation detector
REPEATABILITY: ± 0.01 emittance units
HEAT SINK: Provided to keep both sample and standards