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An interferometric method to measure transient refractive index, birefringence and thickness variation of solids

P S Theocaris, G B Philis and C H Blontzou

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A method for measurement of refractive index and birefringence of transparent solids during transient and dynamic mechanical tests is presented. The method of is based on interferometric measurement of the retardation of light travelling through the specimen under two different incidence angles. In addition, thickness variation during deformation-leading to Poisson's ratio under certain conditions-can be calculated. The method was applied to polymethylmethacrylate and polycarbonate samples subjected to uniaxial tension.


PACS

81.70.Fy Nondestructive testing: optical methods

81.70.Bt Mechanical testing, impact tests, static and dynamic loads

07.60.Hv Refractometers and reflectometers

78.20.Fm Birefringence

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

07.60.Ly Interferometers

Subjects

Condensed matter: electrical, magnetic and optical

Instrumentation and measurement

Condensed matter: structural, mechanical & thermal

Dates

Issue 7 (July 1975)



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