Results 291 to 300 of about 7,676,720 (331)

An image intensifier for the electron microscope

Journal of Physics E: Scientific Instruments, 1968
An image intensifier system using a four-stage image intensifier optically coupled to a phosphor screen in the electron microscope is described. The system is shown to be limited by the quantum noise inherent in the electron image. The system can detect images down to 10 fA cm−2 which is at least an order of magnitude better than can be achieved by a ...
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Contrast in the Electron Microscope Image

Nature, 1958
THE detail seen in a highly magnified electron micrograph is to-day limited more by a lack of contrast in the image than by any lack of resolution in the microscope, which is now usually capable of resolving objects at least as small as 15 A., that is, only a few atoms in diameter.
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Commercial image analysers and the characterization of microscopical images

Journal of Microscopy, 1983
SUMMARYThis review surveys some of the current approaches to the characterization of microscopical images using commercially available image analysers. The role of image pre‐processing and segmentation is considered, together with the characterization of images by optical density, as well as size and shape.The newer analysers are capable of ...
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An Imaging Microscope at 121.6nm

Optical Design and Fabrication 2017 (Freeform, IODC, OFT), 2017
Optical design and system engineering of an imaging microscope with a Lyman-α source at 121.6nm is presented. Preliminary imaging experiments and results are shown, and future implementation of the system is discussed.
Weichuan Gao, Emily Finan, Byeongjoon Jeong, Geon-Hee Kim, Youngsik Kim, Tom Milster   +5 more
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Electron Microscopic Imaging of Integrin

2011
Rotary-shadowed samples often used for electron microscopy do not preserve native integrin conformations. Negatively stained integrins - or, more desirably, unstained integrins in a cryo-condition - are now being used with sophisticated imaging techniques.
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Surface imaging microscope

SPIE Proceedings, 2008
The three-dimensional shapes of microscopic objects are becoming increasingly important for battlespace CBRNE sensing. Potential applications of microscopic 3D shape observations include characterization of biological weapon particles and manufacturing of micromechanical components.
Eric W. Rogala, Isaac N. Bankman
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The Optics of Microscope Image Formation

2003
Although geometric optics gives a good understanding of how the microscope works, it fails in one critical area, which is explaining the origin of microscope resolution. To accomplish this, one must consider the microscope from the viewpoint of physical optics.
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Microscope image reconstruction

Signal Recovery and Synthesis, 1998
In brightfield, phase-contrast or polarization microscopy, the image can be modeled by using scattering theory. The object, consisting of spatial variations in complex refractive index, scatters components of an angular spectrum of plane waves, and the image calculated by integration over incident and scattered waves.
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Microscope image acquisition

1999
Abstract Modern microscopes allow the attachment of a camera. Technology is avail-able to send acquired images directly to a computer for further processing. In these images object features such as length, area, or intensity can be measured with appropriate software. The measurement results can be used to classify objects or to determine
Stephanie L Ellenberger, Ian T Young
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Imaging in scanning microscopes

Ultramicroscopy, 1980
Abstract Sampling theory can and should be applied to the scanning microscope. Although this theory is well-known, the basic principles seem to have been ignored. We show here that the magnification and the resolving power of the microscope are closely linked such that for any given resolution (diffraction limit) then there is an optimum ...
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