A variable-pathlength optical cell with no moving parts

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Abstract
The authors describe a variable-pathlength cell for measuring the optical absorbance, turbidity and diffuse scattering of fluids. The cell is easily filled, demounted and cleaned. It requires a few microlites of fluid, has no moving parts and requires no delicate adjustments. Reproducible results can be obtained at pathlengths of a few micrometers. Results using the cell are given for absorbent and turbid fluids, and for diffuse scattering, large particle dispersions where the particle diameter can be larger than the smallest pathlength of the cell.

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