Computer Science
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8912044s&link_type=abstract
Unknown
Computer Science
Image Processing, Imaging Techniques, Nuclear Explosions, Pinholes, Alignment, Television Cameras, Underground Explosions
Scientific paper
We have developed a simple instrument to accurately measure misalignments between a pinhole imaging assembly and the radiation source it is designed to image. Intended for remotely controlled use in the diagnostic canisters employed in underground nuclear testing, the instrument consists basically of two components: a telescope with attached TV camera, rigidly mounted to the radiation source (the nuclear device being tested), and a target rigidly mounted to the pinhole assembly. When the source and pinhole assembly are final-aligned before the canister is lowered into the test hole, the telescope and target are similarly aligned so that the telescope's crosshairs are centered on the image of a pair of illuminated x-y scales on the target. Whatever misalignment occurs between the source and the pinhole assembly as a result of lowering the canister into the hole and filling the hole with stemming material will thus be reflected in a similar misalignment between telescope and target. This enables us to determine the relative translation and relative tilt the pinhole assembly has undergone with respect to the source. The absolute tilt of the pinhole assembly is determined from a supplementary measurement made with a pair of gravity-sensing electrolytic transducers mounted on the rear (upper side) of the target.
Adams C. H.
Schumacher F. A.
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