Apparatus for measuring particle fallout on a surface using...

G - Physics – 01 – N

Patent

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Details

G01N 21/88 (2006.01) G01N 21/47 (2006.01) G01N 21/94 (2006.01)

Patent

CA 2234515

A measuring apparatus including a ring-shaped base (11) surrounding a telltale plate (P1a) contaminated by particles. Uniformly distributed LEDs (D1, Dx) emitting on a wavelength of 630 nm are attached to the plate. In a preferred embodiment, twelve LEDs (D1, Dx) illuminate the top surface of the telltale plate (P1a) at a low angle of incidence. The lower ring-shaped structure (11) supports a cylindrical optical enclosure (10) underneath an upper ring-shaped structure (12) which in turn supports a CCD detector (122) for measuring the light diffused by the particles, and an optical filter (124) centred on the 630 nm wavelength. The filter (124) and the detector (122) may be removed and replaced with a microscope.

L'appareil de mesure selon l'invention comprend une base annulaire (11) entourant une plaque témoin Plaque témoin (P1a) contaminée par des particules, à laquelle sont fixées, équiréparties, des diodes électroluminescentes (D1, D x), émettant sur une longueur d'onde de 630 nm. Dans une variante préférée, ces diodes (D1, D x) sont au nombre de douze et illuminent la surface supérieure de la plaque témoin (P1a) sous faible incidence. La structure annulaire inférieure (11) supporte une enceinte optique cylindrique (10), surmontée d'une structure supérieure annulaire (12). Cette dernière supporte un détecteur du type "CCD" (122) mesurant la lumière diffusée par les particules et un filtre optique (124) centré sur la longueur d'onde 630 nm. Le filtre (124) et le détecteur (122) sont amovibles de manière à pouvoir les remplacer par un microscope.

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