An infrared measuring apparatus and method for on-line...

Details An infrared measuring apparatus and method for on-line... An infrared measuring apparatus and method for on-line...

G - Physics

01

N

G01N 21/86 (2006.01) G01N 21/27 (2006.01) G01N 21/35 (2006.01) G01N 33/34 (2006.01) G02B 6/04 (2006.01) G02B 26/04 (2006.01)

Patent

CA 2499396

A single vane (46, 48) shutter flag (38) is asynchronously controlled (82) so that a measuring system light source (22) is interrupted for a minimum necessary amount of time for standardization/calibration and normalization of InGaAs system detectors (68a - 68d). Source/detector hemispheres (50, 62) or serially connected randomly oriented fiber bundles (132) homogenize light passing to the detectors. Light source testing is performed by measuring spectral power distributions at a plurality of light source power levels and comparing the measurements to baseline characteristics established for the light source. Calibration sample life is extended indefinitely by controlling the shutter flag to block source light except for short calibration time periods during which standard light levels are provided.

Un obturateur (38) à volet unique (46, 48) est commandé de manière asynchrone (82) afin d'interrompre la source lumineuse (22) du système de mesure pendant le minimum de temps requis pour effectuer la standardisation, le réétalonnage et la normalisation du système de détecteurs (68a - 68d) au InGaAs. Des hémisphères (50, 62) sources/détecteurs ou des faisceaux de fibres (132) à orientation aléatoire montés en série homogénéisent la lumière frappant les détecteurs. L'essai des sources lumineuses consiste à mesurer les distributions spectrales de puissance pour différents niveaux de puissance desdites sources, puis à comparer ces mesures à leurs caractéristiques de base. La durée de vie des éléments d'étalonnage se trouve allongée indéfiniment du fait du blocage de la source lumineuse par l'obturateur à volet, sauf pendant de courtes périodes de niveau normal d'éclairage.

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