NASA NTRS · 19870000133
Side-Looking Viewer for Crevices
Abstract
Side-looking optical viewer inserted into gap 1 mm wide to depth of 10 cm. Instrument allows human observer to inspect small crevices from comfortable viewing angle. Small mirror atop pair of thin, flat legs inserted into gap. Mirror reflects image of gap wall or other object into microscope, which magnifies image 20 times. Quartz/halogen lamp in separate unit provides light to illuminate gap via optical-fiber bundle. Observer looks directly through microscope or attaches photographic or video camera without disturbing setup.
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Hagen, G. R.. 1987-03-01. Side-Looking Viewer for Crevices. https://ntrs.nasa.gov/citations/19870000133
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