X-ray scanner for detecting plastic articles

US4884289A · kind A · utility

Assignee

• Heimann GmbH · DE

Inventors

• Walter Glockmann · Schlangenbad, DE
• Thomas Herwig · Eltville am Rhein, DE

Key dates

• Filing date: May 22, 1987
• Grant date: Nov 28, 1989
• Expiry date: May 22, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V5/222
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An x-ray scanner for detecting plastic articles has an x-ray source which generates a fan-shaped x-ray beam through which an article to be examined is moved. A primary radiation detector array is disposed at a side of the article opposite to the x-ray source and functions to provide a normal x-ray image identifying metal articles. Additional detectors, which detect scatter radiation are disposed around the examination space at a distance from the primary radiation detector. The scatter radiation detectors detect scattered radiation characteristic of that produced by plastic articles. Signals from the scatter radiation detectors are processed, by which the presence of a plastic article can be identified.