Back to results
US 4,425,039 AGranted
Apparatus for the practice of double exposure interferometric non-destructive testing
AssigneeIndustrial Holographics, Inc.
InventorRalph M. Grant
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeIndustrial Holographics, Inc.
InventorRalph M. Grant
Estimating the term…
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.
A pressure chamber useful for performing double exposure interferometric analysis of a test object surface before and after a pressure change, comprising:
A pressure chamber useful for performing double exposure interferometric analysis of the surface of a test object before and after pressure changes, comprising:
Dependencies are inferred from the claim text.