Nanosecond time-gate spectroscopic diagnosis apparatus

G - Physics – 01 – N

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Details

G01N 21/63 (2006.01) G01N 21/25 (2006.01) G01N 21/47 (2006.01)

Patent

CA 2291022

A diagnosis apparatus comprises a shutter (11) disposed between a light source (1) and a lens (12) opposed to biological tissue (13); a multi-channel spectrometer (polychromator) (16) for detecting a light emitting plume (14); a photodetector (5) for detecting a portion of a laser pulse from the light source (1); an oscilloscope (6) which monitors an output from the photodetector (5) to thereby measure a delay time of a gate trigger pulse supplied to a high-speed gate image intensifier (17); a pulse generator (8) capable of independently and freely adjusting the delay times of two output pulses in synchronization with the laser pulse; a gate controller (7) connected to the pulse generator (8) and the oscilloscope (6); the high-speed gate image intensifier (17) intensifying and imaging the output of the multi-channel spectrometer (16) whose gate is opened by the gate controller (7) over a period on the order of nanosecond; a CCD camera (9) capturing an output image from the high-speed gate image intensifier (17); and a data-processing apparatus comprising a frame image data storage (10A) which inputs spectroscopic image data of one frame from the CCD camera (9) as a time-series analog signal, and converts the analog signal to a digital signal for transmission to a computer (10).

L'invention concerne un dispositif de diagnostic spectroscopique à gâchette nanoseconde comprenant une source lumineuse (1) destinée à irradier une pièce de tissu (13) d'un corps vivant avec un laser, un spectroscope (16) destiné à détecter une traînée de lumière (14), un dispositif de commande (7) de gâchette connecté à un oscilloscope (6) et permettant de mesurer le temps de retard des impulsions de déblocage de la gâchette tout en surveillant la puissance de sortie détectée des impulsions laser; le dispositif de commande de gâchette est également connecté à un générateur d'impulsions (8) pour établir de manière arbitraire le temps de retard de deux impulsions de sortie en synchronisation avec des impulsions laser. Le dispositif de diagnostic spectroscopique comprend en outre un intensificateur d'image (17) destiné à produire l'image de la sortie du spectroscope (16) à des intervalles en nanosecondes déterminés par le dispositif de commande (7); et un processeur de données recevant des signaux de série chronologique y compris des données d'images provenant d'une caméra à dispositif de couplage de charge (9) destinée à capturer la sortie de l'intensificateur d'image (17).

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