X-ray measuring method and X-ray measuring device for measuring a strand

The X-ray measuring method of 10, wherein the multiple measuring axes include one or more of the following axes:

• multiple static measuring axes arranged sequentially in the transport direction or an adjustment direction;
• multiple static measuring axes arranged circumferentially around a transport axis;
• multiple static measuring axes arranged circumferentially around an axis of symmetry of the measuring space,
• multiple measuring axes inclined at different angles relative to the transport axis;
• and
• multiple measuring axes inclined at different angles relative to the transport axis for enhancing contrast.

An X-ray measuring method for measuring a strand, comprising the following steps:

• providing an X-ray measuring device, which comprises an X-ray source, an X-ray detector and a measuring space formed in-between them;
• emitting X-rays from the X-ray source through the measuring space and the strand in a measuring plane along a measuring axis and detecting the X-rays passing through the strand by means of the X-ray detector, which comprises at least one detector row of measurement channels;
• generating a transmission curve as a measuring signal by means of the X-ray detector, wherein the transmission curve expresses detected values of the intensity of the measurement channels;
• storing the transmission curve as at least one reference transmission curve;
• carrying out at least one further, current X-ray measurement by means of the X-ray source and the X-ray detector, and generating a current transmission curve;
• comparing the current transmission curve with at least the reference transmission curve, whereby all measurement channels are compared;
• evaluating the comparison and determining whether a fault is present in the strand;
• wherein the strand is a corrugated pipe measuring, both in waves of the corrugated pipe and in valleys of the corrugated pipe, and performing a comparison with a reference transmission curve;
• determining characteristics at different areas or in different measuring planes of the corrugated pipe;
• determining one or more of the following characteristics from the current transmission curve:
• an inner pipe of the corrugated pipe as an area of lower intensity;
• an inner layer of the corrugated pipe as an area of lower intensity;
• waves and valleys, wherein the waves are recognized as material regions spaced apart towards the outside from the inner pipe or the inner layer, wherein defects in both the valleys and the waves are recognized as material weakening or material increase;
• and.

An X-ray measuring device, comprising:

• at least one X-ray source defining a measuring axis and configured to emit X-rays along the measuring axis;
• an X-ray detector;
• a measuring space formed between the X-ray source and the X-ray detector and configured to receive a strand transported in a transport direction;
• an evaluation unit including a memory and configured to:
• receive transmission curves detected by the X-ray detector and to store the transmission curves as reference transmission curves directly or after processing in the memory;
• perform at least one X-ray measurement using the at least one X-ray source and the X-ray detector and generate a current transmission curve;
• compare the current transmission curve of the X-ray detector with the reference transmission curves;
• continuously store the current transmission curve as a reference emission curve in the memory;
• compare the transmission curves across multiple measurement channels;
• and
• evaluate the comparison to determine whether a fault is present in the strand.