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Aceasta tehnica furnizeaza o imagine transparenta tridimensionala, proiectand un fascicul de lumina asupra amprentei si combinand radiatia reflectata cu un fascicul de referinta, obtinut prin reflexia unui fascicul laser de catre o oglinda.
Rezultatul, o imagine de interferenta, este analizat de un fotodetector asemanator celui dintr-un aparat de fotografiat digital, reconstituindu-se astfel o imagine a amprentei digitale
Metoda este mai sensibila, mai precisa si mai rapida decat metoda conventionala, intrucat nu implica nici un fel de tratament chimic al amprentelor.
Sursa: New Scientist
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