Arrangement adapted for spectral analysis

G - Physics – 01 – N

Patent

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G01N 21/61 (2006.01) G01J 3/26 (2006.01)

Patent

CA 2729459

An arrangement ("A1') adapted for a spectral analysis, having a light transmitting means (10, 2a), a delimited space (11) in the form of a cavity serving as a measuring cell and defining an optical measuring distance ("L"), a light sensing means (12) for detecting radiation (4) passing said optical measuring distance ("L") from said light transmitting means (10), and a unit (13), connected at least to said light sensing means (12) and performing the spectral analysis. Beams of radiation from the light transmitting means are made to pass through an optical band-pass filter (3f) at different angles of incidence. The filter is structured so as to pass a wavelength in dependence of the angle of incidence. A first chosen wavelength component is separated from a second wavelength component, each being received in its opto-electric means (3b, 3b') - Said unit is adapted for detecting and calculating n occurring radiation intensity for each such wavelength component.

L'invention porte sur un dispositif (« A1 »), conçu pour une analyse spectrale, qui présente un moyen d'émission de lumière (10, 2a), un espace délimité (11) en forme de cavité servant de cellule de mesure et définissant une distance de mesure optique (« L »), un moyen de détection de lumière (12) pour détecter un rayonnement (4) passant ladite distance de mesure optique (« L ») à partir dudit moyen d'émission de lumière (10), et une unité (13) connectée au moins audit moyen de détection de lumière (12) et effectuant l'analyse spectrale. Des faisceaux de rayonnement provenant du moyen d'émission de lumière sont amenés à passer à travers un filtre passe-bande optique (3f) à différents angles d'incidence. Le filtre est structuré de façon à faire passer une longueur d'onde en fonction de l'angle d'incidence. Une première composante de longueur d'onde choisie est séparée d'une seconde composante de longueur d'onde, chacune étant reçue dans son moyen opto-électrique (3b, 3b'). Ladite unité est conçue pour détecter et à calculer une intensité de rayonnement se produisant pour chaque composante de longueur d'onde.

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