Interferometer for testing forms of surface and stress and strai

Details Interferometer for testing forms of surface and stress and strai Interferometer for testing forms of surface and stress and strai

1996-03-11

1997-12-02

Font, Frank G.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356359, G01B 902

Patent

active

056942176

ABSTRACT:
A .lambda./4 plate is inserted into and retracted from an optical path of polarized light, thereby making it possible to select whether a noise component due to the stress strain within a test object is to be presented in fringes or not. As an operator operates an operation mechanism for a .lambda./4 plate (4), the .lambda./4 plate (4) is inserted into the optical path when a laser beam (2) should be turned into circularly polarized light, whereas the .lambda./4 plate (4) is retracted out of the optical path when the laser beam (2) should be turned into linearly polarized light.

REFERENCES:
patent: 5557408 (1996-09-01), Kanaya

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