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The optical axis of the imaging system must be colinear with the x-ray axis. Two scintillators are positioned on each of two x-ray axes, for a total of four scintillators and four zoom lens systems. An optional configuration will be shown, enabling two lens systems imaging opposite sides of a single scintillator, for a total of four lenses and two scintillators. Although this configuration has advantages, it could suffer from crosstalk. Care must be taken to analyze the anti-reflection coatings applied to all the elements in the imaging chain, including the CCD array and its vacuum window.
Design of two-color counter-propagating laser alignment systems will be demonstrated, which shows how the best possible resolution can be achieved. Flip mirrors are used to allow six alignment lasers to have access to the optical axis. Monitoring all retro-reflections at two different wavelengths simplify optical alignment. The evolution of our x-ray radiographic systems over the last two decades will be discussed.
Design guidelines for predicting stress in cemented doublets undergoing temperature change: part two
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