Procede et dispositif de prelevement d'une partie d'un faisceau lumineux, notamment pour appareil d'analyse de fluorescence

Abstract

Procédé et dispositif de prélèvement d'une partie d'un faisceau lumineux, notamment pour appareil d'analyse de fluorescence.Selon l'invention, on place au moins un modulateur acousto-optique (30) sur le trajet du faisceau, on active ce modulateur pour obtenir un faisceau diffracté (38) d'ordre +1 ou -1, et l'on envoie ce dernier dans un appareil optique (A), qui ne reçoit donc pas ce faisceau diffracté lorsque le modulateur n'est pas activé, ce modulateur formant ainsi un obturateur vis-à-vis de l'appareil.
The invention relates to a method and device for sampling part of a light beam, particularly for a fluorescence analysis apparatus. According to the invention, at least one acousto-optic modulator (30) is positioned on the path of the beam and said modulator is activated in order to produce a diffracted beam (38) of the order of +1 or 1. The latter diffracted beam is subsequently sent to an optical apparatus (A) which only receives said beam when the modulator is activated. In this way, the modulator forms a shutter with respect to the apparatus. The aforementioned apparatus is intended to take measurements and the beam of the order of 0 is used as the reference beam in order to correct said measurements.

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