Optics: measuring and testing – Material strain analysis – With polarized light
Patent
1986-05-08
1988-11-01
Rosenberger, R. A.
Optics: measuring and testing
Material strain analysis
With polarized light
356 32, G01B 1118
Patent
active
047814551
ABSTRACT:
A method and an apparatus for optical strain measurement are disclosed. Prior to the deformation or loading of the object to be tested, the latter is provided with a thin transparent film which adheres well to the object and has a thickness between 3 and 20 .mu.m. After the deformation or during loading, the wavelength-dependent intensity course developed because of the interference of the portion of the beam of light reflected and superimposed at the boundary surfaces of the transparent film is measured and evaluated by a computer.
REFERENCES:
patent: 3082664 (1963-03-01), Acloque
patent: 3623813 (1971-11-01), Hacman
patent: 3824017 (1974-07-01), Galyon
patent: 4493995 (1985-01-01), Adolfsson et al.
patent: 4498772 (1985-02-01), Jastrzebski et al.
"Holographic Method Giving Stress Levels and Visualization of Defects in Thick Cylinders".
Machler Meinrad
Rager Ursula
Schlemmer Harry
Carl-Zeiss-Stiftung
Cooper Crystal
Ottesen Walter
Rosenberger R. A.
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