SMT007 Magazine

SMT-Aug2014

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46 SMT Magazine • August 2014 aRTIClE Since the initial discovery of X-rays on the eve of 20 th century, the technology has become an important tool for non-destructive inspec- tion of internal structure in non-transparent objects. Among the many applications that have been developed, by far the most common is simple transmission imaging, or radiography, which allows operators to view a shadow image of the inspected object's internal structure from various angles by manipulating the position of the object. Individual components of the inspected ob- ject absorb different portions of the emitted X- rays, forming a shadow image on the X-ray de- tector. Selective absorption of X-rays by differ- ent materials allows us to differentiate between solid bodies in an object. Dense items composed of heavier atoms—such as metals—can block a significant portion of incident X-rays and form clear shadow images. The amount of absorbed X-rays also depends on the thickness of the blocking objects, allowing us to determine the physical structure of the inspected target from its X-ray shadow. Photographic film was initially used as a me- dia to record X-ray images, but this is impractical in industrial settings. With the advance of scin- by Ondrej simecek TeST reSeArCH inC. Introduction to Inline AXI Technology Figure 1: in AXi inspection, X-rays emitted from a source tube pass through the inspected object and the resulting X-ray image is captured by the imaging sensor.

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