At present, the x-ray detection equipment on the market is mainly divided into open tube, closed tube and nt tube. They differ in system resolution, geometric magnification, penetration, ray range, maintenance costs, and service life. The nt tube performs best in terms of resolution and magnification, which means that the detection performance of the nt tube is optimal.
The internal principles of the three types of ray tubes are different. The distance between the analyte and the ray focus in the open tube and the nt tube is smaller, and their viewing angle can reach 170 degrees, and the viewing angle of the closed tube is only 50 degrees, so the open tube and the nt tube can obtain a higher magnification.
Closed tubes are the most traditional form of ray tubes and the first generation of ray tubes, using a closed system that produces rays from target reflections. The closed tube structure is single, so it is more convenient to maintain than the other two kinds of ray tubes. Closed tube life surface is limited, generally after 3-5 years need to be replaced as a whole, the image quality will continue to decay, according to its principle, its geometric magnification is low and the viewing angle is small. But the advantage of closed tube is economical, is the lowest price of these three kinds of ray tubes, for enterprises that do not require high-precision inspection needs are more than enough, so closed tube is not bad, or to see which kind of detection needs are suitable.
The open pipe device is characterized by high magnification and large viewing angle, but because of its dynamic vacuum design, it is expensive to maintain and the operator is more demanding.
NT tube is a kind of ray tube between the open tube and the closed tube, which retains the advantages of high magnification, high penetration, high resolution and large viewing angle of the open tube, and adopts a closed system to abandon the vacuum components, reduce the dependence of the equipment on personnel maintenance, and improve the stability of the equipment.
As can be seen from the figure, there are many components of the open pipe equipment, and the maintenance requirements are high.
Closed tube and nt tube composition is simple, vacuum, filament, target maintenance-free, simple maintenance.
Specific choice of which kind of ray tube for quality inspection, mainly depends on the requirements of the enterprise for detection accuracy and budget costs, closed tube is still the most commonly used ray tube on the market, after a long period of evolution, closed tube technology is the most mature, if the pursuit of high-precision detection, it is more recommended to open tube or NT tube, but the price is also very expensive.