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Applied Optics

Applied Optics


  • Vol. 17, Iss. 6 — Mar. 15, 1978
  • pp: 960–963

Thin-wedge-shaped cell for highly absorbent liquids

I. L. Tyler, G. Taylor, and Marvin R. Querry  »View Author Affiliations

Applied Optics, Vol. 17, Issue 6, pp. 960-963 (1978)

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The construction, physical function, and use of a wedge-shaped cell for measuring the Lambert adsorption coefficient of highly absorbent liquids is described. Liquids are held in the cell by surface tension, thus avoiding the use of seals. The cell is simple in its design and is about as convenient to use as an ordinary cuvette.

© 1978 Optical Society of America

Original Manuscript: May 28, 1977
Published: March 15, 1978

I. L. Tyler, G. Taylor, and Marvin R. Querry, "Thin-wedge-shaped cell for highly absorbent liquids," Appl. Opt. 17, 960-963 (1978)

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  1. C. W. Robertson, D. Williams, J. Opt. Soc. Am. 61, 1316 (1971). [CrossRef]
  2. K. F. Palmer, D. Williams, J. Opt. Soc. Am. 64, 1107 (1974). [CrossRef]
  3. Manufactured by De-Sta-Co., Division, Dover Corp., Detroit, Mich. 48203.
  4. Manufactured by Vlier Engineering Corp., Burbank, Calif. 91505.
  5. No. A-45-302-0, Oriel Corp., Stanford, Conn. 06902.
  6. No. 667, L. S. Starrett Co., Athol, Mass. 01331.
  7. Use of the relation (z2 − z1) = Δx tanθ, where θ is the wedge angle and Δx is the vertical translation distance, is still valid for use in Eq. (2), even though there is now a finite vertical aperture.
  8. This assumption is valid provided that the wedge angle is large enough and the measurement wavelength is short enough so at least a couple of interference fringes are in view through the verticle aperture. The maximum error in T(ν,z) caused by interference effects can be shown to be σ I = 2(nl − nw)2[(2n + 1)-π(nl + nw)2]−1, where n is the number of complete fringes in view and nl and nw are the sample and window indices of refraction. For example, with a 25-μm spacer the error in T(ν,z) would be less than 0.2% at a wavelength of 3 μm for most samples and window materials.
  9. These same effects cause an increase of the sample surface area at the exposed edges of the cell. With spacers of 25 μm or less, this results in a significant surface-to-volume ratio. If measurements with narrow spacers require more than an hour or so, it, therefore, is advisable to place pieces of Teflon pipe dope along the two exposed edges after the cell is closed.
  10. I. L. Tyler, M. R. Querry, Bull. Am. Phys. Soc. 22, 641 (1977).
  11. M. R. Querry, I. L. Tyler, W. E. Holland, Bull. Am. Phys. Soc. 22, 641 (1977).

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