'Anisotropy' (pronun. with the stress on the third syllable, ) is the property of being directionally dependent, as opposed to
isotropy, which means homogeneity in all directions. It can be defined as a difference in a physical property (absorbance, refractive index, density, etc.) for some material when measured along different axes. An example is the light coming through a
polarising lens.
Fields of interest
Computer graphics
In the field of
computer graphics, an anisotropic surface will change in appearance as it is rotated about its geometric
normal, as is the case with
velvet.
Anisotropic filtering (AF) is a method of enhancing the image quality of textures on surfaces that are far away and steeply angled with respect to the point of view. Older techniques, such as
bilinear and
trilinear filtering don't take account of the angle a surface is viewed from, which can result in
aliasing or blurring of textures. By reducing detail in one direction more than another, these effects can be reduced.
Chemistry
A chemical anisotropic
filter, as used to filter particles, is a filter with increasingly smaller interstitial spaces in the direction of filtration so that the
proximal regions filter out larger particles and
distal regions increasingly remove smaller particles, resulting in greater flow-through and more efficient filtration.
Physics
A
Plasma lamp displaying the nature of
plasmas, in this case, the phenomenon of "filamentation"
.
Cosmologists use the term to describe the uneven temperature distribution of the
cosmic microwave background radiation. There is evidence for a so-called "Axis of Evil"
[1] in the early Universe that is at odds with the currently favored theory of rapid expansion after the
Big Bang. Cosmic anisotropy has also been seen in the alignment of galaxies' rotation axes and polarisation angles of quasars.
Physicists use the term to refer to some properties of
plasmas. For example, a plasma may have a magnetic field oriented in a preferred direction, or show "filamentation" (such as that seen in
lightning or a
plasma globe) that is directional.
An anisotropic liquid is one which has the fluidity of a normal liquid, but has an average structural order relative to each other along the molecular axis, unlike water or
chloroform, which contain no structural ordering of the molecules.
Liquid crystals are examples of anisotropic liquids.
Some materials
conduct heat inc, that is independent of spatial orientation around the heat source. It is more common for heat conduction to be anisotropic, which implies that detailed geometric modeling of typically diverse materials being thermally managed is required. The materials used to transfer and reject heat from the heat source in
electronics are often anisotropic.
Many
crystals are anisotropic to
light ('optical anisotropy'), and exhibit properties such as
birefringence.
Crystal optics describes light propagation in these media. An 'axis of anisotropy' is defined as the axis along which isotropy is broken (or an axis of symmetry, such as normal to crystalline layers). Some materials can have multiple such
optical axes.
Geology
'
Seismic anisotropy' is the variation of seismic wavespeed with direction. Seismic anisotropy is an indicator of long range order in a material, where features smaller than the seismic
wavelength (e.g., crystals, cracks, pores, layers or inclusions) have a dominant alignment. This alignment leads to a directional variation of
elasticity wavespeed. Measuring the effects of anisotropy in seismic data can provide important information about processes and mineralogy in the Earth; indeed, significant seismic anisotropy has been detected in the Earth's
crust,
mantle and
inner core.
Geological formations with distinct layers of
sedimentary material can exhibit electrical anisotropy;
electrical conductivity in one direction (e.g. parallel to a layer), is different from that in another (e.g. perpendicular to a layer). This property is used in the gas and
oil exploration industry to identify
hydrocarbon-bearing sands in sequences of
sand and
shale. Sand-bearing hydrocarbon assets have high
resistivity (low conductivity), whereas shales have lower resistivity.
Formation evaluation instruments measure this conductivity/resistivity and the results are used to help find oil and gas wells.
Medical Acoustics
Anisotropy is also a well-known property in medical ultrasound imaging describing a different resulting echogenicity of soft tissues, such as tendons, when the angle of the transducer is changed. In
diffusion tensor imaging, anisotropy alterations may reflect diffusion changes of water in the brain, particularly in the
white matter.
Material Science & Engineering
Anisotropy describes the phenomena of
chemical bond strengths being directionally dependent. Most materials exhibit anisotropic behavior, where the
Young's Modulus depends on the direction of the load.
Anisotropy in polycrystalline materials can also be due to certain
texture patterns which are often produced during manufacturing of the material. In the case of rolling, "stringers" of texture are produced in the direction of rolling, which can lead to vastly different properties in the rolling and transverse directions.
Some materials, such as wood and fibre-reinforced
composites are very anisotropic, being much stronger along the grain/fibre than across it. Metals and alloys tend to be more isotropic, though they can sometimes exhibit significant anisotropic behaviour. This is especially important in processes such as
deep-drawing.
Microfabrication
Anisotropic etching techniques (such as
Deep reactive ion etching) are used in microfabrication processes to create well defined microscopic features with a high aspect ratio. These features are commonly used in
MEMS and
microfluidic devices, where the anisotropy of the features is needed to impart desired optical, electrical, or physical properties to the device.
External links
★
Baker Atlas - Formation Evaluation
★
Baker Atlas - Anisotropy and Resistivity Measurements
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