A type of microscope using a beam of electrons rather than visible light.
Scanning electron microscopes are scientific instruments that use a beam of highly energetic electrons to examine objects on a very fine scale. This examination can yield the following information: topography, morphology, composition, and crystallographic Information
SEM is an electron microscope in which a beam of electrons is focused and moved across an object. The secondary electrons produced by the object and the electrons scattered by the object are collected and form a three-dimensional image on a cathode-ray t ube. For more information on this device, see this site.
a microscope that uses electrons to produce an image of the surface of small structures
A scanning electron microscope is a microscope that forms a three-dimensional image on a cathode-ray tube by moving a beam of focused electrons across an object and reading both the electrons scattered by the object and the secondary electrons produced by it.
(sc) microscope used to magnify images as much as 50,000 times by means of scanning with an electron beam. The impinging electrons cause electrons on the surface to be ejected. The ejected electrons are collected and translated into a picture of the surface.
(SEM) Microscope that examines an object directly by scanning the specimen point-by-point with an electron beam; provides greater magnification than an optical microscope.
a microscope which operates similar to a cathode ray tube, electrons are focused and scanned across a sample causing electrons to be released from the surface, the electrons are gathered and converted to an electrical signal proportional to the number and energy of the liberated electrons, this signal is sent to a synchronized CRT display where an image of the surface is built by rastering of the incident and display beams
a microscope that uses a finely focused electron beam scanned across a sample to produce high resolution images. A SEM can resolve much smaller feature than a standard microscope, down to approximately 2 nanometers.
A microscope in which a finely focused beam of electrons is scanned across a specimen, and the electron intensity variations are used to construct an image of the specimen. This type of microscope is ideal for magnifications from 200 to 35,000.
The scanning electron microscope uses a bundled electron beam to scan the sample. The interaction between the beam and the sample is recorded and displayed three-dimensionally. This method achieves a resolution on the nanoscale, i.e. it can recognize individual large molecules. Since the sample has to conduct electricity, a thin film of metal is vaporized onto biological material.
An electron microscope that uses a focused electron beam to produce an image of the specimen's surface. Today, SEMs have a resolution of 1 nm and can magnify over 400,000x.
An instrument used for obtaining microstructure images using an electron beam. The micrographs obtained give depth perception of the metal being observed.
An electron microscope with a beam that scans (moves point-to-point) over the surface of a specimen, producing a lifelike, three dimensional view on film or screen. The magnification of the image is usually less than that of a non-scanning electron microscope. For visualization by a scanning microscope, tissues do not require extensive preparation and handling.
The scanning electron microscope (SEM) is a type of electron microscope capable of producing high-resolution images of a sample surface. Due to the manner in which the image is created, SEM images have a characteristic three-dimensional appearance and are useful for judging the surface structure of the sample.