Instrument for examining a gemstone

G - Physics – 01 – N

Patent

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Details

G01N 21/87 (2006.01)

Patent

CA 2416507

The instrument has a housing (1) mounting the following components to provide a self-contained, stand-alone instrument: a compact solid state 532nm laser 9 coupled to a window (5) in a thermally-insulated container (2) for liquid nitrogen and the gemstone (4); a compact solid state diode 655 nm laser (10) coupled to the window (5); two compact, sensitive CCD spectrometers 11a and 11b detecting luminescence features with zero-phonon lines at in the range 550- 1000 nm; a processor (17) for processing the signals from the spectrometers 11a and 11b to indicate whether the gemstone (4) is a natural diamond which has not been subjected to irradiation treatment or hgih-pressure high- temperature treatment; and a display (18). The container (2) has a cover (6) and a pin (8) which is used to place and hold the gemstone (4) against the window (5).

L'objet de cette invention est un instrument comprenant un boîtier (1) sur lequel sont montés les composants suivants, le tout formant un instrument compact et autonome : un laser solide compact de 532 nm (9) relié à une fenêtre (5) dans un conteneur (2) isolé thermiquement dans lequel sont placés de l'azote liquide et la pierre précieuse (4) ; un laser solide compact à diode de 655 nm (10) relié à la fenêtre (5) ; deux spectromètres CCD sensibles compacts 11?a¿ et 11?b¿ détectant des caractéristiques de luminescence avec des raies à zéro phonon dans une plage de 550-1000 nm ; un processeur (17) traitant les signaux en provenance des spectromètres 11?a¿ et 11?b¿ pour déterminer si la pierre précieuse (4) est un diamant naturel n'ayant subi aucun traitement d'irradiation ni de traitement à haute température et haute pression ; et une unité d'affichage (18). Le conteneur (2) est muni d'un couvercle (6) et d'une tige (8) utilisée pour mettre en place et maintenir la pierre précieuse (4) contre la fenêtre (5).

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