A New Method for the Absolute Measurement of Reflectivity

P. M. D. Bradshaw1, R. Phillips and R. A. Smith2
Department of Geology, University of Durham
1Present address: Applied Geochemistry Section, Department of Geology, Imperial College of Science and Technology, London.
2Department of Mathematics, Durham.

Summary: The theory of a new method for the determination of reflectivity at truly normal incidence is described. A parallel light beam falls on the specimen after passing through a glass cube with semi-silvered diagonal mounted at the centre of an optical goniometer. The various reflected beams are measured by a photomultiplier fixed to the telescope of the goniometer. Experiment has proved the validity of the method and the spectral reflectivity of pyrite in air and in oil has been investigated.

Mineralogical Magazine; June 1966 v. 35; no. 274; p. 861-866; DOI: 10.1180/minmag.1966.035.274.07
© 1966, The Mineralogical Society
Mineralogical Society (www.minersoc.org)