A Pinhole Camera for Spear 2
نویسندگان
چکیده
A new pinhole camera system has been installed on Spear 2 to measure its vertical emittance. The hard X-rays from a bending magnet source point are imaged on a phosphor screen through a 30 um x 25 um pinhole aperture. The resolution of the system for 8 keV photons is limited to 31.2 um by Fraunhoffer diffraction and is much smaller than the 340 um FWHM vertical beam size corresponding to 0.9% vertical coupling. Measurements are presented. Optimal pinhole location and hole size are discussed.
منابع مشابه
Three-dimensional source reconstruction with a scanned pinhole camera.
We present a simple reconstruction algorithm for three-dimensional (3D) incoherent source distributions imaged by a laterally scanned pinhole camera. We consider digital sampling of multiple pinhole images for 3D reconstruction and implement an experimental demonstration with lateral resolution of 2x10(-3) rad and longitudinal resolution of approximately 0.14z(2) m , where z is the object-to-pi...
متن کاملBasic 3D Geometry for One and Two Cameras
where c is the column and r is the row. (This is a Point Grey convention, and it assumes the camera center is exactly in the center column and row of the image. In fact, proper camera calibration can be done to get a better estimate of the center.) The (X,Y,Z) coordinate system is shown in Fig. 1, and the (u, v) system in Fig. 2: Z points along line of sight, away from camera; X (and also u) po...
متن کاملCoded aperture imaging: predicted performance of uniformly redundant arrays.
Uniformly redundant arrays (URA) have autocorrelation functions with perfectly flat sidelobes. The URA combines the high-transmission characteristics of the random array with the flat sidelobe advantage of the nonredundant pinhole arrays. A general expression for the signal-to-noise ratio (SNR) has been developed for the URA as a function of the type of object being imaged and the design parame...
متن کاملCamera Model Design
Camera models are essential infrastructure in computer graphics, visualization, and vision. The most frequently used model is the planar pinhole camera, because it approximates the human eye well, producing familiar images, and because it is simple, enabling efficient software and hardware implementations. However, the requirement that all rays pass through a common point is restrictive and rel...
متن کاملThe Evolution of Film Photography to Digital
Roots of Digital Techniques and Functions in Traditional Film Photography Photography is the result of combining several technical discoveries. Chinese philosopher Mo Di and Greek mathematicians Aristotle and Euclid described a pinhole camera in the 5th and 4th centuries BCE. From rudimentary forms like the pinhole camera and the camera obscura, Film and print photography has transformed with t...
متن کامل