Virtual Deflectometry Enclosure ScreenTechnology #ua19-136
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Title: Virtual Deflectometry Enclosure Screen
Invention: This inventions addresses the above shortcomings of existing deflectometry systems and provide s simple and compact, yet accurate, deflectometry devices, methods and systems that can be feasibly implemented for measuring optical components having arbitrary shapes and surface characteristics, including flat and/or highly convex optical components. The disclosed techniques can enable a 2π-steradian measurement range (i.e., a half-sphere) and a 4π-steradian measurement range.
Background: Deflectometry is a non-null test method which has been shown to provide surface metrology accuracy similar to commercial interferometry systems. While existing interferometric and deflectometry techniques may be feasibly implemented for measuring concave and/or small objects, they become prohibitively expensive and even impossible for convex optics, both standard in shape, as well as freeform. Interferometric approaches, swing arm profilometry, and the Hindle test, for example, typically require measuring sub-apertures of the unit, which are then ‘stitched’ together. However, having an interferometric setup and the required null optic is not always a viable option.
* Easy to construct
* Measures surface profiles for flats, concave, freeform, and highly convex surfaces
* Can achieve 2pi and 4pi steradian coverage
* Optical metrology
Contact: Amy Phillips
Refer to case number U19-136