Device and method for optical measurement

US6556295B2 · kind B2 · utility

Assignee

• Foss Tecator AB · SE

Inventors

• Erland Leide · Helsingborg, SE
• Nils Wihlborg · Helsingborg, SE
• Håkan Wedelsb{haeck over (a)}ck · Ängelholm, SE
• Tomas Jonasson · Helsingborg, SE
• Roger Ylikangas · Lerberget, SE

Key dates

• Filing date: Jan 29, 2001
• Grant date: Apr 29, 2003
• Expiry date: Oct 4, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N15/147
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and device for optical measuring of small particles for analysis of the quality of the particles. A sample-feeding carrier is adapted to take up particle samples in sample holders and transport the particle samples to a place for optical measurement. A mirror-supporting means follows the movement of the carrier and has mirrors matching the sample holders. A device illuminates a particle sample when positioned for optical measurement and a detector, which is sensitive to electromagnetic radiation, records a result of optical measurement of the illuminated particle sample. A mirror reflects the particle sample, so that a mirror image thereof stands essentially still seen from the detector, when a measurement is being recorded, owing to the fact that the mirror image of the particle sample falls on a center axis of the movement of the mirror-supporting means.