Computer graphics; minicomputer results from a micro
Explore the source record for details and available documents.
Open-File Report↗
Geology topics
A.F. Theisen
Publications and source records attributed to A.F. Theisen.
Laboratory analysis and airborne detection of materials stimulated to luminesce by the sun
The Fraunhofer line discriminator (FLD) is an airborne electro-optical device used to image materials which have been stimulated to luminesce by the Sun. Such materials include uranium-bearing sandstone, sedimentary phosphate rock, marine oil seeps, and stressed vegetation. Prior to conducting an airborne survey, a fluorescence spectrometer may be used in the laboratory to determine the spectral region where samples of the target material exhibit maximum luminescence, and to select the optimum Fraunhofer line.
Journal of Luminescence↗