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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 6, Iss. 1 — Jan. 1, 1967
  • pp: 101–105

The New Tungsten-Filament Lamp Standards of Total Irradiance

Ralph Stair, William E. Schneider, and William B. Fussell  »View Author Affiliations


Applied Optics, Vol. 6, Issue 1, pp. 101-105 (1967)
http://dx.doi.org/10.1364/AO.6.000101


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Abstract

The National Bureau of Standards standard of total irradiance as presently issued in the form of a 50-W carbon filament lamp was originally calibrated more than fifty years ago. Recently, needs for higher accuracy and wider ranges of total irradiance have necessitated the setting up of three sizes (100 W, 500 W, and 1000 W) of tungsten-filament lamp standards of total irradiance. These standards operate at a higher temperature than was possible with the carbon-filament lamps, and are shielded, except for a narrow area of the bulb in front of the filament, so the reception of long wavelength flux from the lamps is reduced to a minimum. The new lamps were calibrated by the use of a blackbody at a known temperature together with a quartz plate whose spectral transmittance was accurately determined. The quartz plate limits the flux received from the blackbody to the spectral region below about 4.5 μ and thus reduces errors resulting from water vapor absorption at 6 μ and longer wavelengths. Comparisons show the new standards to be in close agreement with the carbon-filament lamp standard.

© 1967 Optical Society of America

History
Original Manuscript: July 25, 1966
Published: January 1, 1967

Citation
Ralph Stair, William E. Schneider, and William B. Fussell, "The New Tungsten-Filament Lamp Standards of Total Irradiance," Appl. Opt. 6, 101-105 (1967)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-6-1-101


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References

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