X - ray is one of the five conventional methods of radiology and is widely used in industry. X-rays are not substantially different from natural light. Both kinds of light are electromagnetic waves, but X-ray quanta are much more energetic than visible light. It has complex physical and chemical interactions with matter and can penetrate objects that visible light cannot. It can ionize atoms, cause certain substances to fluoresce, and cause certain substances to undergo photochemical reactions. If the workpiece is locally defective, it will change the attenuation of the object to the light and cause the change of the intensity of the transmitted light. Through certain detection methods, we can judge whether the workpiece has defects, as well as the location and size of defects.

X-rays are very short wavelength electromagnetic waves. They are photons. X-rays can penetrate matter that ordinary visible light cannot. The permeability depends on the wavelength of the X-ray, the density and thickness of the material it penetrates. The shorter the wavelength of light, the more penetrating it is; The lower the density and the thinner the thickness, the easier it is for X-rays to pass through.

As the X-rays are absorbed by a substance, the molecules that make up the substance are broken down into positive and negative ions, which is ionization. The number of ions is proportional to the amount of X-rays absorbed by the substance. The number of X-rays can be calculated from the degree of ionization of air or other substances.

The basic principle of X-ray imaging is determined by the properties of X-rays and the difference in density and thickness. The existing X-ray detection equipment can realize real-time imaging, greatly improving the detection efficiency.

X-ray detection technology can be divided into quality detection, thickness measurement, article inspection, dynamic research four categories of applications. Quality inspection is widely used in casting, welding process defect detection, industry, lithium battery, electronic semiconductor and other fields. Thickness gauges can be used for on-line, real-time, non-contact thickness measurement. Cargo inspection can be used for airport, station, customs inspection, structure size determination. Dynamics can be used to study dynamic processes such as ballistics, explosion, nuclear technology and casting technology.

X-ray detection will not damage the detected object, convenient and practical, and can achieve the unique detection effect that other detection means can not achieve.

With the discovery, application and development of x-ray, X-ray detection has been widely used in various industries. x-ray testing equipment is also known as X-ray fluoroscopy detector, X-ray nondestructive detector. x-ray detector is a test means of using low energy X-ray to quickly detect the internal quality of the inspected items and the foreign matter in it, and display the image of the inspected items through the computer.