scanning electron microscope

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microscope

 [mi´kro-skōp]
an instrument used to obtain an enlarged image of small objects and reveal details of structure not otherwise distinguishable.
The light path of a darkfield microscope. From Hart and Shears, 1997.
acoustic microscope one using very high frequency ultrasound waves, which are focused on the object; the reflected beam is converted to an image by electronic processing.
binocular microscope one with two eyepieces, permitting use of both eyes simultaneously.
compound microscope one consisting of two lens systems whereby the image formed by the system near the object is magnified by the one nearer the eye.
darkfield microscope one so constructed that illumination is from the side of the field so that details appear light against a dark background.
electron microscope one in which an electron beam, instead of light, forms an image for viewing, allowing much greater magnification and resolution. The image may be viewed on a fluorescent screen or may be photographed. Types include scanning and transmission electron microscopes.
fluorescence microscope one used for the examination of specimens stained with fluorochromes or fluorochrome complexes, e.g., a fluorescein-labeled antibody, which fluoresces in ultraviolet light.
light microscope one in which the specimen is viewed under ordinary illumination.
operating microscope one designed for use in performance of delicate surgical procedures, e.g., on the middle ear or small vessels of the heart.
phase microscope (phase-contrast microscope) a microscope that alters the phase relationships of the light passing through and that passing around the object, the contrast permitting visualization of the object without the necessity for staining or other special preparation.
scanning electron microscope (SEM) an electron microscope that produces a high magnification image of the surface of a metal-coated specimen by scanning an electron beam and building an image from the electrons reflected at each point.
simple microscope one that consists of a single lens.
slit lamp microscope a corneal microscope with a special attachment that permits examination of the endothelium on the posterior surface of the cornea.
stereoscopic microscope a binocular microscope modified to give a three-dimensional view of the specimen.
transmission electron microscope (TEM) an electron microscope that produces highly magnified images of ultrathin tissue sections or other specimens. An electron beam passes through the metal-impregnated specimen and is focused by magnetic lenses into an image.
x-ray microscope one in which x-rays are used instead of light, the image usually being reproduced on film.

scan·ning e·lec·tron mi·cro·scope

a microscope in which the object in a vacuum is scanned in a raster pattern by a slender electron beam, generating reflected and secondary electrons from the specimen surface that are used to modulate the image on a synchronously scanned cathode ray tube; with this method a three-dimensional image is obtained, with both high resolution and great depth of focus.

scanning electron microscope (SEM)

an instrument similar to an electron microscope in that a beam of electrons is used to scan the surface of a specimen. The beam is moved in a point-to-point manner over the surface of the specimen. These electrons are deflected, collected, accelerated, and directed against a scintillator. The large number of photons thus created are converted into an electric signal that, in turn, modulates the beam scanning the surface of the specimen. The image produced appears to be three-dimensional and lifelike. Compare electron microscope, transmission scanning electron microscope.

scan·ning e·lec·tron mi·cro·scope

(skan'ing ĕ-lek'tron mī'krŏ-skōp)
A microscope in which the object in a vacuum is scanned in a raster pattern by a slender electron beam, generating reflected and secondary electrons from the specimen surface that are used to modulate the image on a synchronously scanned cathode ray tube; with this method a three-dimensional image is obtained, with both high resolution and great depth of focus.

scanning electron microscope

see ELECTRON MICROSCOPE.

scan·ning e·lec·tron mi·cro·scope

(skan'ing ĕ-lek'tron mī'krŏ-skōp)
A microscope in which the object in a vacuum is scanned in a raster pattern by a slender electron beam, generating reflected and secondary electrons from the specimen surface that are used to modulate the image on a synchronously scanned cathode ray tube; with this method a three-dimensional image is obtained, with both high resolution and great depth of focus.

scanning electron microscope (SEM),

References in periodicals archive ?
We have developed a safe technique to accurately deploy SEMS under direct vision, thus obviating the need for fluoroscopy.
with recommending how the effectiveness of offshore SEMS systems should
A bimonthly SEMS newsletter, a fourth initiative, will provide updates on ongoing initiatives, announce events, highlight new website content and more.
granting SEMS a royalty of US$5 per ounce of gold produced for the first
Tom Teipner, Schlumberger President -- North America, added, "While the current regulations apply only to operators on the outer continental shelf, I believe that voluntary participation in the SEMS audit process demonstrates Schlumberger's unwavering commitment to the safety and integrity of our industry.
On April 5, 2013, BSEE issued SEMS II, which revised and added several new elements to the SEMS I rule, effective as of June 4, 2013.
More than 90 different presentations on engineering management research are planned across 34 sessions, including a panel session on performance measurement and the SEMS Town Hall meeting, with a majority of these having full papers submitted for inclusion in the conference proceedings.
The information in this report as it relates to Exploration Results was prepared by Harry van den Berg, who is a full-time employee of SEMS Exploration Services Ltd with the title of Consultant Geophysicist and Database and GIS Manager.
Northrop Grumman's SEMS work includes supporting AFW's continuing enhancement of existing systems, development of enterprise-level distribution methods that use network-centric services, expanding on-demand capabilities and fully integrating environmental domain data from land, sea, atmosphere and space sensors.
Meanwhile COS is actively driving improved safety in deepwater offshore and the SEMS regulations incorporate much of this Center's work product, thereby applying it to all offshore operators regulated by BSEE, regardless of water depth.
Having just returned from the IIE Annual Conference and Expo in Cancun, Mexico, I am reminded yet again of how much I get out of being involved with, and being a member of, lie and SEMS.
SYDNEY -- Charter Pacific Corporation Limited ("Charter Pacific") (ASX:CHF), a diversified investment company listed on the ASX, has appointed SEMS Exploration Services (SEMS) to undertake the next phase of the exploration programme at the company's iron ore mining tenements in Mauritania, West Africa.