High-efficiency fast X-ray imaging detector development at SSRF

Indirect X-ray imaging detectors consisting of scintillator screens, long-working-distance microscope lenses and scientific high-speed complementary metal-oxide semiconductor (CMOS) cameras are usually used to realize fast X-ray imaging with white-beam synchrotron radiation. However, the detector efficiency is limited by the coupling efficiency of the long-working-distance microscope lenses, which is only about 5%. A long-working-distance microscope lenses system with a large numerical aperture (NA) is designed to increase the coupling efficiency. It offers an NA of 0.5 at 8 × magnification. The Mitutoyo long-working-distance microscope lenses system offers an NA of 0.21 at 7.5 × magnification. Compared with the Mitutoyo system, the developed long-working-distance microscope lenses system offers about twice the NA and four times the coupling efficiency. In the indirect X-ray imaging detector, a 50   µ m-thick LuAG:Ce scintillator matching with the NA, and a high-speed visible-light CMOS FastCAM SAZ Photron camera are used. Test results show that the detector realized fast X-ray imaging with a frame rate of 100000   frames   s − 1 and fast X-ray microtomography with a temporal sampling rate up to 25   Hz (25   tomograms   s − 1).

Source: Journal of Synchrotron Radiation - August 22, 2019 Category: Physics Authors: Xie, H. Luo, H. Du, G. Zhao, C. Xu, W. Zhou, G. Chen, R. Xiao, T. Tags: scintillators indirect X-ray imaging detectors long-working-distance microscope lenses fast X-ray imaging fast X-ray microtomography CMOS cameras dynamic X-ray micro-CT synchrotron radiation research papers Source Type: research