Patent ID: 6693988
Filing Date: 2004-02-17
Classification: G01N,G01V

Abstract:
An arrangement for measuring the pulse transmission spectrum of x-ray quanta elastically scattered in a scanning area for containers, the arrangement comprising:a scanning area; a polychromatic x-ray source arranged on one side of the scanning area; a detector arrangement arranged on the other side of the scanning area, wherein the detector arrangement measures the energy of the scattered x-ray quanta; a primary ray collimator arrangement arranged between the scanning area and the x-ray source; a secondary ray collimator arrangement, allowing passage only of scattered rays within a certain scatter angle range to the detector arrangement, arranged between the scanning area and the detector arrangement; means for processing the measured signals; wherein the detector arrangement is positioned on a Z axis, which simultaneously forms an axis of symmetry about which the secondary ray collimator arrangement extends cylindrically symmetrically; wherein on the Z axis a point 0 is provided which determines the origin of a Cartesian coordinate system with X axis and Y axis; wherein a conveying axis for a container to be examined extends parallel to the Z axis; wherein the primary ray collimator arrangement allows passage only of x-ray beams which are substantially impinging on the point 0; wherein the x-ray source is arranged behind the primary ray collimator arrangement together with an extended anode having a focus position controlled electronically about the length of the anode; and wherein the primary ray collimator arrangement and the x-ray source extend cylindrically symmetrically about the axis of symmetry or linearly parallel to the Y axis in the X-Y plane.