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- W1995016536 abstract "The lamp described was designed primarily as an alternative to the tungsten strip lamp, which is used as a temperature standard for radiation pyrometry, in order to obtain greater reproducibility and a higher maximum temperature. A close approximation to a black-body radiator is achieved by electrically heating in vacuo (to 1800 °C) or in argon (to 2700 °C,) a tungsten tube, 2 mm in diameter and 45 mm long, in which the radiating surface is a bundle of fine tungsten wire situated at the centre of the tube. The radiation emerges axially from an aperture 1 mm in diameter near the end of the tube. Within the limits of ±0.2% no difference in emissivity could be detected over the wavelength range examined, namely 0.5 to 0.7 μm and the absolute value of the emissivity was estimated to be not less than 0.95. The constancy of the current-temperature calibration of the vacuum lamp, when operated continuously at 1800 °C for at least 100 h is ±0.02 °C. At this temperature the vacuum lamp requires 29 A at 5 V. The argonfilled lamp can be operated at 2700 °C (56 A, 12 V) at which temperature a slow drift in calibration of about 0.05 °C/h occurs." @default.
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- W1995016536 date "1967-01-01" @default.
- W1995016536 modified "2023-10-18" @default.
- W1995016536 title "A Lamp as a Reproducible Source of near Black-Body Radiation for Precise Pyrometry up to 2700 °C" @default.
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- W1995016536 doi "https://doi.org/10.1088/0026-1394/3/1/004" @default.
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