Raster Scanning
Raster Scanning - Related Videos
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Dual Raster-Scanning Photoacoustic Small-Animal Imager for Vascular Visualization
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Cited by 1 •
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A dual raster-scanning photoacoustic imager was designed, which integrated wide-field imaging and real-time imaging.
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Scanning Electron Microscopy (SEM)
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Source: Laboratory of Dr. Andrew J. Steckl — University of Cincinnati A scanning electron microscope, or SEM, is a powerful microscope that uses electrons to form an image. It allows for imaging of conductive samples at magnifications that cannot be achieved using traditional microscopes. Modern light microscopes can achieve a magnification of ~1,000X, while typical SEM can reach magnifications of more than 30,000X. Because the SEM doesn’t use light to create images, the resulting pictures it...
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Leaky Scanning
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2020
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Video-rate Scanning Confocal Microscopy and Microendoscopy
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Cited by 14 •
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The complete construction of a custom, real-time confocal scanning imaging system is described. This system, which can be readily used for video-rate microscopy and microendoscopy, allows for an array of imaging geometries and applications not accessible using standard commercial confocal systems, at a fraction of the cost.
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Precision Milling of Carbon Nanotube Forests Using Low Pressure Scanning Electron Microscopy
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Low pressure scanning electron microscopy in a water vapor ambient is used to machine nanoscale to microscale features in carbon nanotube forests.
FAQs
The instrument’s detected response determines what the map can show. A focused beam, probe, or detector may be used to collect emitted light, particle intensity, height, or a chemical signal at each measured position. Consequently, raster scanning can support different kinds of surface characterization, with the recorded signal linking spatial location to a structural or chemical feature.
Regular line-by-line movement gives every measurement a defined place within the sample area. Combining those position-specific readings into a two-dimensional map allows researchers to compare neighboring regions rather than treating the sample as chemically uniform. This spatial organization is especially important when a chemical change or material feature occurs only in a localized part of the surface.
Raster scanning separates structural and compositional questions through the response being measured. Height-related readings can reveal surface structure, whereas emitted light, particle intensity, or chemical signals can indicate other properties of the mapped region. In chemistry, selecting and interpreting the relevant response helps connect surface features with the distribution of elements or molecular species.
A chemistry-focused workflow begins by identifying the surface or sample feature to characterize and the type of response needed. The instrument then moves the focused beam, probe, or detector across the area in a regular pattern while recording readings. The collected measurements are combined into a spatial map, which can then be examined for structural or chemical variation.
Researchers can use these maps to characterize materials and relate localized composition or surface features to performance. In catalysis, spatially resolved chemical information can help examine where material differences occur. In nanotechnology, mapping supports analysis of surface structure and composition at small scales. The same approach also serves broader analytical research involving material characterization.
A chemical map can identify localized chemical changes and show how elements or molecular species are distributed across a surface or sample. Those observations provide evidence for comparing regions within a material and for relating composition to performance. The map therefore supports interpretation of material behavior without treating the entire sample as compositionally identical.