Low Cost Polarized Light Microscopy

Abstract

This paper describes a simple and inexpensive adaptor for the conversion of essentially any transmitted light microscope into a polarized light microscope. Although the focus is on the specific application of asbestos identification, microscopes adapted in this manner have general utility for identification of various crystalline and noncrystalline materials. The conversion allows one to study extinction characteristics, birefringence, pleochroism, sign of elongation, isotropy/anisotropy, as well as dispersion staining colors. Key components of the adaptor are a polarizer, an analyzer, a retardation plate, a stage rotation device, and central and annular stops. Construction details are included and allow fabrication of the adaptor at very low cost with minimal machining, using readily available materials. Instructions for its use are also provided and serve to complement a working knowledge of identification techniques. Polarized light microscopy has great utility for a number of industrial hygiene applications. Hopefully the adaptor described herein will serve to broaden its accessibility. Jones, W. G.; Thorne, P. S.; Clere, J. L.: Low cost polarized light microscopy.