NASA NTRS · 19920000004
Simple Schlieren Light Meter
Abstract
Simple light-meter circuit used to position knife edge of schlieren optical system to block exactly half light. Enables operator to check quickly position of knife edge between tunnel runs to ascertain whether or not in alignment. Permanent measuring system made part of each schlieren system. If placed in unused area of image plane, or in monitoring beam from mirror knife edge, provides real-time assessment of alignment of schlieren system.
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Rhodes, David B., Franke, John M., Jones, Stephen B., Leighty, Bradley D.. 1992-01-01. Simple Schlieren Light Meter. https://ntrs.nasa.gov/citations/19920000004
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