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Not to be confused with Diffraction tomography.
Diffraction topography (short: "topography") is a imaging technique based on Bragg diffraction.
Diffraction topographic images ("topographies") record the intensity profile of a beam of X-rays (or, sometimes, neutrons) diffracted by a crystal.
A topography thus represents a two-dimensional spatial intensity mapping (image) of the X-rays diffracted in a specific direction, so regions which diffract substantially will appear brighter than those which do not. This is equivalent to the spatial fine structure of a Laue reflection.
Topographs often reveal the irregularities in a non-ideal crystal lattice.
X-ray diffraction topography is one variant of X-ray imaging, making use of diffraction contrast rather than absorption contrast which is usually used in radiography and computed tomography (CT). Topography is exploited to a lesser extends with neutrons, and is the same concept as dark field imaging in an electron microscope.
Topography is used for monitoring crystal quality and visualizing defects in many different crystalline materials.
It has proved helpful e.g. when developing new crystal growth methods, for monitoring growth and the crystal quality achieved, and for iteratively optimizing growth conditions.
In many cases, topography can be applied without preparing or otherwise damaging the sample; it is therefore one variant of non-destructive testing.
and 21 Related for: Diffraction topography information
Diffractiontopography (short: "topography") is a imaging technique based on Bragg diffraction. Diffraction topographic images ("topographies") record...
'X-ray diffractiontopography; methods and applications'. Tanner is best known for research and business applications of X-ray diffractiontopography. Tanner...
Colin John (1969). Aspects of multiple beam electron diffraction and X-ray diffractiontopography. jisc.ac.uk (PhD thesis). University of Cambridge. OCLC 885437201...
information within each diffraction pattern can be analysed in more detail. For texture and orientation measurements, the diffraction patterns are binned...
materials. Unlike crystalline materials which exhibit strong Bragg diffraction, the diffraction patterns of amorphous materials are characterized by broad and...
single crystals and for his extraordinary achievements in X-ray diffractiontopography". 4th 1996 Michael Rossmann "For his work on molecular replacement...
[citation needed] Optical microscopy and electron microscopy involve the diffraction, reflection, or refraction of electromagnetic radiation/electron beams...
producing various signals that contain information about the surface topography and composition of the sample. The electron beam is scanned in a raster...
Wayback Machine. Accessed 12 December 2008. "Diffraction and Optimum Aperture – Format size and diffraction limitations on sharpness". www.bobatkins.com...
number of different interferometer techniques, three are most prevalent: diffraction grating interferometers. vertical scanning or coherence probe interferometers...
fractions of a nanometer, more than 1000 times better than the optical diffraction limit. Atomic force microscopy (AFM) is a type of scanning probe microscopy...
electron microscopes are often used in electron diffraction mode. The advantages of electron diffraction over X-ray crystallography are that the specimen...
up to 100% in order for the test to be considered successful. Laser diffraction analysis can also be used as alternative to the sieving and hydrometer...
small (1–2 mm), image sharpness may be limited by diffraction of light by the pupil (see diffraction limit). Between these extremes is the pupil diameter...
used, and the ability of the reduction lens system to capture enough diffraction orders from the illuminated mask. Current state-of-the-art photolithography...
these early computer models considered the effects of roadway geometry, topography, vehicle volumes, vehicle speeds, truck mix, road surface type, and micro-meteorology...
microscopy are interferometric microscopy, optical coherence tomography and diffraction phase microscopy. Common to all methods is the use of a reference wave...
H. Nataf (1998). "Detection of mantle plumes in the lower mantle by diffraction tomography: Hawaii". Earth and Planetary Science Letters. 159 (3–4):...
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