title: Direct determination of isochromatic fringe order by use of two wavelengths.
abstract: A method of direct determination of photoelastic fringe order is proposed. The relations between the integral fringe order for one wavelength and the fractional fringe orders of two wavelengths are derived. The exact fringe order of the whole field is automatically calculated. The usefulness of this method is demonstrated through experimental result.
authors.affiliation: Department of Applied Mechanics, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: C H
authors.initials: CH
authors.lastname: Hu