Premium
An Arctangent Unwrapping Technique of Photoelasticity Using Linearly Polarized Light at Three Wavelengths
Author(s) -
Kihara T.
Publication year - 2003
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1046/j.1475-1305.2003.00055.x
Subject(s) - inverse trigonometric functions , photoelasticity , optics , wavelength , trigonometric functions , phase (matter) , interpolation (computer graphics) , waveplate , function (biology) , mathematics , physics , mathematical analysis , geometry , laser , motion (physics) , classical mechanics , quantum mechanics , cauchy stress tensor , evolutionary biology , biology
Abstract: In the automatic measurements of the principal stress directions ψ and the total relative phase retardation ρ tol , ψ and ρ tol can be easily obtained by the phase unwrapping method using the arctangent function. However, only some published works exist on the measurements of ψ and ρ tol by photoelastic techniques using a linearly polarised incident light source. This paper presents the technique of applying an unwrapping by means of the arctangent function to photoelasticity. The technique overcomes the error associated with the quarter‐wave plate by using an incident light of different wavelength and does not need an interpolation for the determination of ψ . The technique is validated by determining ψ and ρ tol for the well‐known circular disk subjected to a diametral compressive load model.