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The accurate measurement of the directional total emittance of uncoated and coated float glass at 283 K

Pantinakis Apostolos, B. W. Jones

Πλήρης Εγγραφή

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Περίληψη

The directional total emittance ε' of coated float glass (fluorine-doped tin oxide coating 300 nm thick) and uncoated float glass was measured at 283 K and in the angular range 10° to 84°. The direct method was employed in which the radiation emitted by the sample was measured using a broad-band Golay detector. A novel scheme of discriminating against unwanted radiation allows fractional uncertainties of ±1% or better (1 s.d.) to be achieved. The uncoated glass, the directional total emittance of which can be calculated accurately, was used to test the apparatus, and the difference between the measured and the calculated values was found to be not greater than ±1%, fractional, for angles less than 80°.

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