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Applied Optics

Applied Optics


  • Vol. 10, Iss. 12 — Dec. 1, 1971
  • pp: 2644–2650

Reflectance Measurements on Cavity Radiators

O. C. Jones and C. Forno  »View Author Affiliations

Applied Optics, Vol. 10, Issue 12, pp. 2644-2650 (1971)

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A knowledge of the emissivity of a cavity radiator may be deduced from reflectance measurements, but these may be difficult to make if the cavity has a small aperture and low reflectance. The use of a He–Ne laser as a source facilitates such measurements. Results are presented for one ceramic and three metallic cavities that have been used in photometric and spectroradoimetric standards work. An integrating sphere method appears more satisfactory than a goniophotometric approach.

© 1971 Optical Society of America

Original Manuscript: June 3, 1971
Published: December 1, 1971

O. C. Jones and C. Forno, "Reflectance Measurements on Cavity Radiators," Appl. Opt. 10, 2644-2650 (1971)

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  14. We later examined the tuft from a lamp that had operated for about 100 h. Its reflectance was considerably higher (15%), but the minimal effects of tube temperature gradients still apply. Figure 11 shows the visual comparison of a new tuft (right) and used tuft (left).

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