Abstract

A long path gas absorption cell especially suited for infrared analyses of components of extremely low concentrations and absorption coefficients is described. The cell can be evacuated or pressurized. With aluminized mirrors and KBr field lenses, the evacuated cell performs with a peak efficiency of 45 percent of incident energy at 10 meters path length. Path length is adjustable by 1.25-meter increments from 1.25 meters to 10 meters. Adjustments are simple and can be made in a matter of a few minutes with good reproducibility. The cell will attach to the Perkin-Elmer Models 12, 112, and 21 spectrometers with compatibility to other attachments. The optical path can be altered quickly so that the usual sampling space of the spectrometer is available.

© 1954 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. John U. White, J. Opt. Soc. Am. 32, 285 (1942).
    [Crossref]

1942 (1)

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)

F. 1
F. 1

Optical path of the long path cell when attached to a Perkin-Elmer Model 12 or Model 112 spectrometer.

F. 2
F. 2

Efficiency of the long path cell as a function of wavelength. Cell open to atmosphere. KBr field lenses. Aluminized mirrors.

F. 3
F. 3

Efficiency of the long path cell as a function of wavelength. Cell evacuated. KBr field lenses. Aluminized mirrors.

F. 4
F. 4

View of assembled and mounted cell from rear of a Perkin-Elmer Model 112 spectrometer. (A) sampling port; (B) cell mounting screws; (C) leveling screws.

F. 5
F. 5

Long path cell with cover off. (A) sampling port; (B) push-pull mirror rotational adjustments.