METHOD AND DEVICE FOR DETECTING A GIVEN MATERIAL IN AN OBJECT USING ELECTROMAGNETIC RAYS

摘要

The invention relates to a method for detecting a given material in an object (1), especially in a piece of luggage, using electromagnetic rays, wherein the intensities of the non-absorbed rays from at least three ray planes (5.1 - 5.2) are measured and evaluated in assigned detector arrays (4.1 - 4.5). According to the invention, the following method steps are carried out: 1) preparing an at least two-dimensional image of the object (1) from the measured intensity values; 2) selecting a spatial area shown on the image based on the values of a material variable which is determined from intensity measurements for checking purposes; 3) determining at least one spatially geometric variable in the area to be checked from the position data of a second two-dimensional image and intensity values using a stored value of a specific variable of a presumed object influencing absorption; 4) additionally determining the corresponding spatially geometric variable alone from three-dimensional geometric values detected from measured intensity values; 5) directly or indirectly comparing the values determined in steps 3) and 4) of the spatially geometric variable or from values of a variable derived therefrom in order to determine the actual presence of the presumed material.