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.
© 1999 Optical Society of America
Chang-Hua Hu, "Direct Determination of Isochromatic Fringe Order by use of Two Wavelengths," Appl. Opt. 38, 5384-5387 (1999)