منابع مشابه
Ranging Performance Evaluation of a Laser Scanner
INTRODUCTION Large volume laser scanners are used for a variety of purposes, including dimensional metrology of large artifacts, digitization and reverse engineering, as well as historical preservation and archiving. These devices exploit the propagative properties of structured light (in this case, lased light) to collect spatial information of objects in the field of view. Laser scanners empl...
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A piezoelectric tube of the type typically used for actuation in Scanning Tunneling Microscopes (STMs) and Atomic Force Microscopes (AFMs) is considered. Actuation of this piezoelectric tube is hampered by the presence of a lightly damped low frequency resonant mode. This resonant mode is first identified and then damped using a Positive Velocity and Position Feedback (PVPF) controller, a contr...
متن کاملA "high-performance" 2D gel scanner.
We describe the design principles of a photometric flatbed scanner with a scan area of 250 X 250 mm2, a dynamic range of 4000 gray levels, a signal/noise ratio of 2000/1, a step size of 0.1 mm, and a step frequency of 2000 steps per second. It is controlled by a microcomputer and used to acquire data for quantitative evaluation of gels or chromatograms. The performance of the instrument is demo...
متن کاملA Review of the Performance of the International Atomic Energy Agency Regarding Pakistan’s Nuclear Activities
Among the significant issues of the subcontinental region, one can refer to the concern over Pakistan’s inability to maintain the security of its nuclear facilities, the illegal increase in its nuclear weapon production, extremist organizations’ access to nuclear weapons, as well as the fact that this country has not joined the NPT treaty. Meanwhile, the International Atomic Energy Agency (IAEA...
متن کاملThe imaging performance of a LaBr3-based PET scanner.
A prototype time-of-flight (TOF) PET scanner based on cerium-doped lanthanum bromide [LaBr(3) (5% Ce)] has been developed. LaBr(3) has a high light output, excellent energy resolution and fast timing properties that have been predicted to lead to good image quality. Intrinsic performance measurements of spatial resolution, sensitivity and scatter fraction demonstrate good conventional PET perfo...
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ژورنال
عنوان ژورنال: Nuclear Instruments and Methods
سال: 1959
ISSN: 0029-554X
DOI: 10.1016/0029-554x(59)90096-5