Experimental Mechanics

, Volume 13, Issue 3, pp 138–141

Determination of integral fringe order in photoelasticity

Integral fringe orders associated with measured fractional fringe values can be determined using two different wavelengths of light; a ready-reckoner table for them can also be constructed


  • L. S. Srinath
    • Indian Institute of Science
  • A. V. S. S. S. R. Sarma
    • Indian Institute of Technology

DOI: 10.1007/BF02323972

Cite this article as:
Srinath, L.S. & Sarma, A.V.S.S.S.R. Experimental Mechanics (1973) 13: 138. doi:10.1007/BF02323972


The paper describes a method to determine the integral fringe order associated with a fractional fringe value that is measured using Tardy or other similar compensators. The method makes use of two different wavelengths of light to determine the fractional fringe values. Further, it does not assume the independence of the material fringe constant on the wavelength of light used. From these measured fractional fringe values, the associated integral fringe order is determined. A method to construct a ready-reckoner table is also described which helps to identify the integral fringe order from any two measured fractional fringe values.

Download to read the full article text

Copyright information

© Society for Experimental Mechanics, Inc. 1973