A: The basic principle
During the X-RAY test, X-RAY rays penetrate the sample to be examined and form an enlarged X-ray image on the image detector (which is now mostly using the X-RAY image intensifier). The quality of the image is mainly determined by the resolution and contrast. (Currently Zhuomao Optoelectronics uses a full digital flat panel image detector from Rayence) The resolution (sharpness) of the imaging system is determined by the focal spot size of the X-ray source. The geometric magnification of the X-ray path can reach 10 to 2500 times, Detector pixels can be as small as tens of microns. The contrast of the imaging system depends on the detection efficiency of the image detector, the signal to noise ratio of the electronics system, and the appropriate X-ray energy. The current general X-ray imaging technology can achieve better than 1% contrast.
B: X-ray tube
In a simple X-ray tube, electrons come out of the hot cathode and pass through an electric field, accelerating toward the anode. Stop when it hits the anode, releasing X-rays at the same time. The size of the collision area is the size of the x-ray source, which is in millimeters, in which case we can only get very unclear images. Through the use of micro-focus X-ray tube, you can change this situation. Electrons enter the magneto-optic lens through an aperture in the anode and the magnetic field forces in the lens focus the electron beam on a focal spot on the cathode target that is only a few tens of microns in diameter. In this way, the x-ray source becomes very small, with clear images with a resolution in the micrometer range at high magnifications.
C: X-ray detector (X-ray imaging)
For many years scientists have worked hard to create a reusable imagery that replaces film. For most critical medical and industrial applications, these efforts did not succeed very successfully for film-based testing until digital imaging technology emerged that provided a viable option. For 50 years, film ray inspection has been used as a major quality assurance tool to provide quality information on the internal parts of manufactured parts. Unfortunately, film is an expensive tool because the carrier of the image-film is a silver-based technique that is used only once. In addition, the film needs to be rinsed, both time-consuming and using hazardous chemicals that must be discarded.
Compared with film, digital photography will significantly reduce the exposure and processing time, low cost (no film and chemical materials), no chemical waste, all of these features have greatly reduced costs. In addition, unlike film images, digital images can be enlarged to improve the detection rate of defects, and in some cases automatic evaluation of test results can be used. The digital test results are transferred from the field to the office via wireless transmission, and the storage and storage costs are low.
