Principle of X-ray detection

Principle of X-ray detection
X-rays are electromagnetic radiation waves similar to light, heat and radio waves, which are characterized by short wavelengths. The shorter the wavelength of the radioactive material, the greater its ability to penetrate the material. Therefore, the X-ray has a great ability to penetrate the substance, and the X-ray detection is formally utilized.

X-ray inspection applied in casting defects
The casting method is widely used in many fields of industrial production, especially in the automobile manufacturing industry, because of its advantages of low cost, one-time forming, and the ability to manufacture large-sized parts with complicated structures. In the aerospace industry, many components are also castings. In order to ensure product quality and save costs, it is necessary to detect defects in time in the early stages of the production process. Non-destructive testing is the preferred method for defect detection of castings because it avoids material waste and increases production efficiency. By far the most studied and effective methods include ultrasonic flaw detection, X-ray transillumination and radiography.

With the expansion of production scale and the improvement of quality inspection standards, the requirements for radiation detection equipment and related technologies are also increasing. For X-ray inspection, the new research focuses on continuously improving the acquisition technology of X-ray images and developing modern computer hardware and software technologies to enable the detection process to be carried out in a mode that is told and truly fully automated.

A commonly used X-ray inspection technology in the detection of casting defects is an X-ray image automatic defect detection system. The system consists of four parts: an event support system; an X-ray generating device; a sensor and an image processor that convert X-ray energy into electrical signals. Due to the particularity of the images obtained by X-rays, the corresponding sensors for acquiring images are also different. There are two main types: one is a flat grid based on an amorphous silicon or selenium sensor array; the other is based on a linear diode,Array.

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