| 摘要 |
<p>A fluorescent-activated spatially quantitative light detector for sensing light reflected from an information bearing surface, said light detector comprising a generally cylindrical rod containing a fluorescent dye dispersed throughout a generally transparent medium and a photosensor at one end of, and in operative association therewith. The reflected light incident on the light detector is absorbed by said dye and reradiated at the fluorescent wavelength, a portion of this reradiated light reaching the photosensor causing an output signal to be generated.</p> |
