Apparatus for sampling a material travelling past a sampling...

G - Physics – 01 – D

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G01D 18/00 (2006.01) G01D 3/08 (2006.01) G01N 21/86 (2006.01) G01N 23/16 (2006.01) G01N 21/59 (2006.01)

Patent

CA 2070762

A sampling system includes a plurality of sensing means (3) mounted on one or more beams (2) which reciprocate, over a moving web (1) of material. The sensing zones of adjacent sensing means (3) trace out scanning paths which periodically overlap in a sampling region. One of the sensing means (primary) scans over a known reference to update its calibration periodically or continuously and this is transferred to the other sensing means (secondary) effectively via the travelling material (due to the overlap). Calibration is performed by signal processing means, storing and comparing monitoring signal levels or corresponding digital values derived at positions of overlap and making computations for the purpose of calibration. With sufficient overlap of the scanning paths any one of the sensors can be made redundant. Alternatives include sensing means which move relative to other sensing means as well as rotary arrangements.

Système d'échantillonnage comprenant un cumul de moyens de détection (3) montés sur un ou plusieurs faisceaux (2) qui alternent sur une toile mobile (1). Les zones de détection des moyens de détection voisins (3) analysent les voies de balayage qui se chevauchent périodiquement dans une région d'échantillonnage. L'un des moyens de détection (primaire) balaie une référence connue pour mettre à jour périodiquement ou continuellement son étalonnage, et ces données sont effectivement transmises à l'autre moyen de détection (secondaire) par le matériel mobile (en raison du chevauchement). L'étalonnage est assuré par un moyen de traitement du signal, qui stocke et compare les niveaux des signaux de surveillance ou les valeurs numériques correspondantes obtenues des positions de chevauchement et effectue des calculs aux fins de l'étalonnage. Avec un chevauchement suffisant des voies de balayage, n'importe quel détecteur peut devenir redondant. Les alternatives comprennent des moyens de détection qui se déplacent par rapport à d'autres moyens de détection ainsi que des dispositifs tournants.

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