Real Time Autocollimator Device for Aligning Two Surfaces in Parallel.
Patent, Filed 26 May 87, patented 27 Sep 88,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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This patent discloses a real time autocollimator for measuring parallelism of two surfaces. The autocollimator uses a laser to provide light to first and second beam splitters. A second beam splitter directs dissimilarly polarized light to each surface. This light is reflected to, then recombined by the second beam splitter prior to being redivided by a third beam splitter for comparison at quadrant detectors. Patents. EDC
- Lasers and Masers