Not Available in Your Country
Michel-Levy Birefringence Chart

The birefringence of a anisotropic material can be estimated when observed and/or photographed in a polarized light microscope. A relationship between interference color and retardation can be graphically illustrated in the classical Michel-Levy interference color chart, presented above. This graph plots retardation on the abscissa and specimen thickness on the ordinate. Birefringence is determined by a family of lines that emanate radially from the origin, each with a different measured value of birefringence corresponding to thickness and interference color.

The Michel-Levy chart is utilized by comparing the highest-order interference colors displayed by the specimen in the microscope to those contained on the chart. Once the appropriate color has been located, the nearest vertical line along the interference color is followed to the nearest horizontal line representing the known thickness. Birefringence is determined by selecting the diagonal line crossing the ordinate at the intersection of the specimen interference color and thickness value.

Contributing Authors

Robert Hoffman - Modulation Optics, Inc., 100 Forest Drive, Greenvale, New York 11548.

Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.

Sorry, this page is not
available in your country.

This site uses cookies to enhance performance, analyze traffic, and for ads measurement purposes. If you do not change your web settings, cookies will continue to be used on this website. To learn more about how we use cookies on this website, and how you can restrict our use of cookies, please review our Cookie Policy.

OK