X-ray inspection-Digital radiography

Digital radiography
1. Computer radiography is a technique in which information after passing X-rays through a workpiece is recorded on an imaging plate, read by a scanning device, and then a digital image is generated by a computer. The entire system consists of an imaging plate, a laser scanning reader, a digital image processing and storage system.

2. Advantages and limitations of CR technology
(a) The original X-ray equipment does not need to be replaced or modified and can be used directly.
(b) The tolerance is large and the exposure conditions are easy to select. Films that are underexposed or transitioned can be remedied by influencing the process.
(c) The amount of photographic exposure can be reduced. The CR technology provides a methodological gain on the information acquired by the imaging plate, which greatly reduces the amount of X-ray exposure.
(d) The digital image generated by CR technology is convenient for storage, transmission, extraction and observation.
(e) The imaging plate, like film, has different specifications and can be divided and bent. The imaging plate can be reused thousands of times, and its life depends on the degree of mechanical wear. Although the price of the veneer is expensive, it is actually cheaper than film.
(f) The spatial resolution of CR imaging can reach 5 line pairs/mm, which is slightly lower than the film level.
(g) Although it is faster than the film, but the image cannot be obtained directly, the CR screen must be placed in the reader to obtain the image.
(h) CR imaging plates, like film, must be used under conditions that are not suitable for use in wet environments and extreme temperature conditions.

3. Line array scanning imaging technology
Line array scanning digital imaging system works. X-rays emit a beam of X-rays that pass through the detected workpiece, are received by a line scan imager (LDA detector), convert X-rays directly into digital signals, and then transmit them to image acquisition control. And computer.

4. Classification of digital imaging detectors
Digital imaging detectors are the plumbing components of digital imaging systems. A variety of digital imaging detectors are arrays of integrated digital components. According to the principle and device of the photoelectric conversion device, the digital imaging detector can be divided into two categories: gas detector and solid detector.

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