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Applied Optics

Applied Optics


  • Vol. 36, Iss. 10 — Apr. 1, 1997
  • pp: 2133–2138

Plano–concave microcuvette for measuring the absorption coefficient of highly absorbing liquids

M. Csete and Zs. Bor  »View Author Affiliations

Applied Optics, Vol. 36, Issue 10, pp. 2133-2138 (1997)

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A powerful and simple method based on the use of a plano–concave microcuvette was investigated for measuring the absorption coefficient of highly absorbing liquids. A plano–convex lens put on a plane–parallel plate formed a microcuvette with small, continuously varying thicknesses. This microcuvette was filled with liquid and illuminated by a homogeneous beam. The parabolic variation of the liquid thickness generates a Gaussian spatial intensity distribution behind the cuvette. This Gaussian profile, detected by a CCD camera, was used to determine the absorption coefficient of the liquid. An absorption coefficient as high as 1.54 × 104 cm-1 was measured by use of high-concentration malachite green dye solutions. A comparison of the results with data extrapolated from those of conventional methods showed good agreement.

© 1997 Optical Society of America

Original Manuscript: May 21, 1996
Revised Manuscript: July 31, 1996
Published: April 1, 1997

M. Csete and Zs. Bor, "Plano–concave microcuvette for measuring the absorption coefficient of highly absorbing liquids," Appl. Opt. 36, 2133-2138 (1997)

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