Process for obtaining information of a stimulus of stimulation modulated; apparatus to obtain information from a response to a stimulus modulated exciting; and process and apparatus for identifying objeBands or zones of an article

摘要

In order to identify diamonds in gangue, incident radiation from laser 3 is scanned along an extended line across particulate gangue, and the diamonds 2 are identified by detecting the Raman radiation which is emitted, using a narrow pass band filter 9 in order to block out other radiation. In order to identify the position along the scan line from which the Raman radiation was emitted, the incident laser radiation is pulsed at a pulse frequency which changes along the scan line, and the frequency of the Raman radiation detected is sensed. In this way, one can simplify the equipment needed. IMAGE