DEVICE FOR MEASURING THE THICKNESS PROFILE OF ROLLED SHEET METAL STRIP

1. A device for measuring the thickness profile of rolled metal sheets and strips (24), comprising an X-ray tube (11), a movable slit diaphragm (12) lying closely in front thereof and radiation detectors (14 to 23) fixedly installed at a distance in front thereof, along a line and directed towards the radiation, the sheet or strip (24) to be measured being moved through the radiation between the X-ray tube (11) or slit diaphragm (12) and the radiation detectors (14 to 23) in such a way that its width extends along the line of the fixedly installed radiation detectors (14 to 23) and a processing device (45) being connected to the radiation detectors and a displacement pick-up (44) of the slit position to determine the radiation absorption and for allocation of the thicknesses of the sheet/strip to the measuring points or measuring areas (31 to 39) distributed over the width of the sheet/strip (24), which device (45) is connected with a display device (46), characterized in that the slit diaphragm (12) is constructed circularly around the part of the X-ray tube (11) emitting the X-ray rays, is mounted rotatably and is driven by a drive, in that the distance between the slit diaphragm (12) and the radiation detectors (14 to 23) amounts to more than 1 500 mm, in that the X-ray tube (11) with the slit diaphragm (12) and the radiation detectors (14 to 23) are installed in separate frames and in that means for correction are inserted for the displacement pick-up (44), by means of which small alterations in the position of the attachment points of the slit diaphragm (12) and the radiation detectors (14, 23) are taken into account.