Abstract
The paper is dealt with different structures of the digital radiographic system intended for wire rope radiography. The scanning geometry of the wire rope is presented and the main stages of its digital radiographic image generation are identified herein. Correction algorithms are suggested for X-ray beam hardening. A complex internal structure of the wire rope is illustrated by its 25 mm diameter image obtained from X-ray computed tomography. The paper considers the approach to the analysis of digital radiographic image algorithms based on the closeness of certain parameters (invariants) of all unit cross-sections of the reference wire rope or its sections with the length equaling to the lay. The main invariants of wire rope radiographic images are identified and compared with its typical defects.
Highlights
For the last few decades, non-destructive testing techniques have been rapidly developed, including those applied for wire ropes
NDT techniques used for detecting manufacturing and operational defects of wire ropes include various optical, magnetic, ultrasonic, electrical, and other methods [1,2,3]
Wire ropes with large diameter are the most complicated test objects for NDT testing. Such objects can be tested by classical radiography which has a number of disadvantages, namely: the use of argentum-containing radiographic films that results in a high cost of testing and the extremely low performance due to the multi-stage and long-term formation of shadow images
Summary
For the last few decades, non-destructive testing techniques have been rapidly developed, including those applied for wire ropes. 2. Structures of the digital radiographic system The digital radiographic image of a wire rope is generated by its scanning with a narrow X-ray beam produced by a slit collimator. 3. Layout geometry of scanning a wire rope Figure 1 presents the cross-sectional view of the digital radiographic system and continuous scanning with a narrow X-ray beam similar to that one described in the work of Osipov et al [10]. The image analysis of wire rope CT-scans is difficult for an operator due to a heterogeneous distribution of intensity in the image These difficulties can be eliminated by the use of specialized algorithms calculated for processing the radiographic images as described, for example, in the work of Osipov et al [8]. X-ray beam hardening correction algorithm The traditional equation for the radiometric signal I and the thickness ρH (g/cm2) of the attenuation material is as follows [12]:
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