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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 1, Iss. 1 — Jan. 1, 1962
  • pp: 75–77

A Rotating-Sector Attenuator of Adjustable Transmittance for Precise Spectrophotometry

James E. Stewart  »View Author Affiliations


Applied Optics, Vol. 1, Issue 1, pp. 75-77 (1962)
http://dx.doi.org/10.1364/AO.1.000075


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Abstract

A rotating-sector attenuator has been constructed using components of readily available precision. The transmittance of the attenuator is adjustable in motion through a differential gear system and can be read from a dial with a precision of about ±0.02% of maximum transmittance. The sector has been used to measure and calibrate the photometric properties of spectrophotometers in the ultraviolet, visible, and infrared regions. It has also been used as an attenuator in an optical-null infrared spectrophotometer in place of the usual comb. Absorption spectra of typical samples have been made with a precision of ±0.04% transmittance. Transmittance and absorptivity data are presented for samples of calcium fluoride in the 700 to 1300 cm−1 spectral region.

© 1962 Optical Society of America

History
Original Manuscript: May 10, 1961
Published: January 1, 1962

Citation
James E. Stewart, "A Rotating-Sector Attenuator of Adjustable Transmittance for Precise Spectrophotometry," Appl. Opt. 1, 75-77 (1962)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-1-1-75

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