An apparatus designed to measure the optical constants of a powder suspended in a liquid is described. A laser source (3.391 μm) and attenuated total reflection approach are used. The accuracy of the apparatus is evaluated by comparing measured results for a liquid hydrocarbon with published results obtained using a different technique. An error analysis is presented. Data obtained for a carbon black powder are discussed and compared with previously published results from specular reflection measurements. The applicability of the Maxwell-Garnett effective medium theory is considered.
© 1983 Optical Society of America
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