Apparatus for the practice of double exposure interferometric no

Details Apparatus for the practice of double exposure interferometric no Apparatus for the practice of double exposure interferometric no

1982-05-07

1984-01-10

Marcus, Stephen

Optics: measuring and testing

Material strain analysis

By light interference detector

248 1, 356244, G01B 9025

Patent

active

044250398

ABSTRACT:
A machine for performing double exposure, interferometric analysis of the changes in an object surface that result from changes in the ambient pressure on the object, as by holography, includes a pressure chamber partially formed by a horizontal base operative to support the test object and interferometric camera on its upper surface. A semispherical pressure dome is placed on the base over the test object and camera. A manifold volume bounded by a thin resilient steel disc supported beneath the base plate on a rubber gasket has its pressure equalized with the area beneath the dome by passages formed beneath the base plate. When the pressure is changed beneath the dome a similar pressure change occurs in the manifold volume beneath the base so that no net pressure forces are exerted on the base plate and no deformation of the camera or test object occurs.

REFERENCES:
patent: 3111074 (1963-11-01), Kennard, Jr. et al.
patent: 3816649 (1974-06-01), Butters et al.
patent: 3998347 (1976-12-01), Mahl
patent: 4234256 (1980-11-01), Yeager

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