EP 0855021 A1 19980729 - APPARATUS FOR MEASURING PARTICLE FALLOUT ON A SURFACE USING A TELLTALE PLATE
Title (en)
APPARATUS FOR MEASURING PARTICLE FALLOUT ON A SURFACE USING A TELLTALE PLATE
Title (de)
VORRICHTUNG ZUR MESSUNG EINES TEILCHENNIEDERSCHLAGS AUF EINER OBERFLÄCHE MITTELS EINER REFERENZSCHEIBE
Title (fr)
APPAREIL DE MESURE DE RETOMBEES DE PARTICULES SUR UNE SURFACE, UTILISANT UNE PLAQUE TEMOIN
Publication
Application
Priority
- FR 9601505 W 19960926
- FR 9511869 A 19951009
Abstract (en)
[origin: FR2739692A1] 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.
IPC 1-7
IPC 8 full level
G01N 15/00 (2006.01); G01N 21/88 (2006.01); G01N 21/94 (2006.01)
CPC (source: EP US)
G01N 21/8806 (2013.01 - EP US); G01N 21/94 (2013.01 - EP US)
Citation (search report)
See references of WO 9714030A1
Designated contracting state (EPC)
BE CH DE ES GB IT LI NL SE
DOCDB simple family (publication)
FR 2739692 A1 19970411; FR 2739692 B1 19971212; EP 0855021 A1 19980729; JP H11513494 A 19991116; US 6122053 A 20000919; WO 9714030 A1 19970417
DOCDB simple family (application)
FR 9511869 A 19951009; EP 96932658 A 19960926; FR 9601505 W 19960926; JP 51475597 A 19960926; US 5141598 A 19980407