electro-, electr-, electri-
(Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity)
Electronics in our lives consists of numerous tools
Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.
2. A sensitive electrical test for detection of retinal pigment epithelium dysfunction.
3. The study and interpretation of electroencephalograms made by moving the eyes a constant distance between two fixed points.
4. The recording and interpretation of the voltages which go with eye movements.
Eye-position voltages from electrodes placed on the skin near the eye are amplified and applied to a strip-chart recorder.
Since the phase shift of a light wave is a function of the index or refraction of the medium in which it is propagating, the change in index can be used to phase modulate the light wave by shifting its phase at a particular point along the guide, by changing the propagation time to the point.
The deflection of the beam depends on its particular polarization.
The effect can be used to modulate a light beam in a material since many properties; such as, light-conducting velocities, reflection, and transmission coefficients at interfaces, acceptance angles, critical angles, and transmission modes, are dependent on the refractive indexes of the media in which the light travels.
2. A material having refractive indexes which can be altered by an applied electric field.
2. A radar system using electrooptic, or electro-optic, techniques and equipment instead of microwave to perform an acquisition and tracking operation.
2. Birefringence induced by an electric field or an optical property in which a single ray of unpolarized light splits into two components traveling at different velocities and in different directions.
In birefringent materials either the separation between neighboring atomic structural units is different in different directions, or the bonds tying such units together have different characteristics in different directions.
2. A method for the machine-reading of typeset, typed, and, in some cases, hand-printed letters, numbers, and symbols using optical sensing and a computer.
The light reflected by a printed text; for example, is recorded as patterns of light and dark areas by an array of photoelectric cells in a optical scanner.
The detector may be a phototube; a photononductive, photovoltaic, or a photojunction cell; a phototransistor; or a thermal detector; such as, a thermocouple or a bolometer (a device for detecting and measuring small amounts of thermal radiation).
2. The change in the index of refraction of a material when subjected to an electric field.
The effect can b used to modulate a light beam in a material since many properties; such as, light-conduction velocities, reflection, and transmission coefficients at interfaces, acceptance angles, critical angles, and transmission modes, are dependent on the refractive indexes of the media in which the light travels.
An optical scanning and recognition system is used in conjunction with a matching system to enable efficient authentication for secure spaces and devices. Like other finger scanning technologies, electro-optical fingerprint recognition makes it possible to quickly and accurately compare a given fingerprint image to thousands of stored images.
Electro-optical fingerprint scanners are generally designed to be portable, easy to use, and physically rugged. The devices are becoming more widely used as an alternative to passwords for consumer electronics or as part of a two-factor authentication system where more stringent security is required.
The fingerprint is optically scanned directly from the finger and the resulting image is focused onto a small chip. The chip converts the focused image into a digital file that can be processed, stored, and compared with other fingerprint images.
The high-resolution digital images can be processed like any other scanned images, eliminating problems caused by aliasing (also called jaggies) and making it possible to quickly compare a fingerprint image with other fingerprint images in a large database.