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fixed Dictionary Terms

Keplerian astronomical telescope
A simple form of astronomical telescope that uses a fixed objective and a focusable eyepiece. The objective forms an...
wide-angle lens
A wide-angle lens is a type of camera lens that has a shorter focal length than a standard or normal lens, allowing it to...
attenuator
An electronic transducer, either fixed or adjustable, that reduces the amplitude of a wave without causing significant...
flatbed scanner
An imaging device analogous to a drum scanner, but operating at greater speeds; it uses a row of sensors to traverse an...
glass annealing furnace
A furnace, generally electrically heated, with a control system capable of following a cam by which the temperature can be...
asynchronous transfer mode
A method of data multiplexing that can provide large, instantaneous bandwidths for busy traffic while permitting slow...
boxcar averager
An instrument for detecting and analyzing repetitive signals. Using a fixed time delay or "gate," the input signal...
negative carrier
The structure that holds the photographic negative in a proper position that is both flat and parallel to the lens plane, as...
panoramic distortion
The image distortion produced by a panoramic camera with a swinging lens or a swinging mirror in front of a fixed lens. The...
Senarmont compensator
A type of compensator for use with a microscope and consisting of a quarter-wave plate in a fixed position and a rotatable...
Brace-Lemon spectrophotometer
A spectrophotometer having a pair of identical collimators with two Glan polarizing prisms, one fixed in azimuth and the...
frequency
With reference to electromagnetic radiation, the number of crests of waves that pass a fixed point in a given unit of time,...
dynamic beam correction
The superimposition of a pilot object on each hologram. The fixed relative position of the scanning and pilot beam during...
zenith telescope
A telescope that is fixed or has a limited degree of movement in a vertical plane; primarily used to determine the position...
positioning
Positioning generally refers to the determination or identification of the location or placement of an object, person, or...
gyroscope
A gyroscope is a mechanical device consisting of a spinning disk or wheel mounted on a spinning axis in such a way that its...
visual field
The angular field of view that is seen by the eyes when fixed on a point straight ahead. The normal binocular visual field...
drum scanner
An image-processing device that scans in a straight line parallel to the axis of a rotating cylinder to which the material...
fixed-focus mode
 unmanned aerial vehicle
An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without a human pilot onboard. UAVs are remotely...
fixed axis of rotation
The locus of points in a system along a line that remains stationary while the remainder of the system rotates.
image centroid
Often referred to as the geometric center of a given image or image plane, the centroid of an image is a fixed point located...
computer numerically controlled grinding
Computer numerically controlled (CNC) grinding is a manufacturing process that utilizes computerized controls and precision...
event-based sensor
An event-based image sensor, also known as a dynamic vision sensor (DVS), is a type of digital imaging device designed to...
fixed focus
Describes devices that are not provided with a means of focusing.
compacting
The heat-treating method in which the index of refraction of glass is fixed near or at its maximum value by holding the...
digital camera
A digital camera is a device that captures and records still images or video in digital format. Unlike traditional film...
convergent beam sensing mode
A type of photoelectric proximity mode sensing incorporating a lens system to focus the light from the emitter in a small,...
parametric oscillator
A device using a parametric amplifier inside a resonant optical cavity to generate a frequency-tunable coherent beam of...
fixed-pattern noise
Fixed-pattern noise is the measure of the static (nontemporal) differences between pixels when the detector is evenly...
slit
An aperture, usually rectangular in shape, with a large length-to-width ratio, and a fixed or adjustable shape through which...
fingerprint camera
A fixed-focus camera designed to record the ink impression of fingerprints that have been impressed on a card or form for...
coincidence rangefinder
An optical instrument used to determine the distance to a target being viewed. Two similar optical systems view the target...
raster scan display
A display in which regeneration takes place serially at a fixed speed in a set pattern through the scan lines.
reflecting prism
A prism having several plane polished surfaces, some to transmit light, some to reflect light, and some to serve both...
printer
A photographic enlarger with a fixed negative plane and a fixed paper plane, often using a roll of paper that is advanced...
intravital microscopy
Intravital microscopy is an imaging technique used to visualize biological processes within living organisms, typically in...
stylus indicator alignment
A method used in surface quality testing for accurate positioning and rotation of metal spheres about an axis or fixed point...
spatial coherence
The maintenance of a fixed-phase relationship across the full diameter of a cross section of a laser beam.
transparency
An image affixed to a transparent photographic film or plate by photographic, printing or chemical methods. It may be viewed...
photopolymerization
A process in which a mixture of one or more monomers, plus a catalyst, polymerize under exposure to light radiation....
modulated grating hologram
A computer-generated, phase-and-amplitude, off-axis hologram made by a multi-exposure technique that uses three computer...
machine vision lens
A machine vision lens is a specialized optical lens designed for use in machine vision systems, which are used for automated...
coherent fiber bundle
A coherent fiber bundle (CFB), also known as a coherent fiber optic bundle, is an assembly of multiple optical fibers...
rotary camera
A camera system used for microphotography that has a structure, such as a cylinder or surveyor belt, to rotate the documents...
coudé
A set of mirrors along a telescope's polar axis designed to redirect light to a fixed position without being affected by the...
sidereal time
Frequently used in astronomical measurement, it is based on the diurnal rotation of a star relative to the fixed stellar...
FTIR spectrometer
FTIR (Fourier transform infrared) spectrometer is a powerful analytical instrument used to obtain an infrared spectrum of...
imbedding material
A thermoplastic or thermosetting material used to hold an object fixed and keep it from deterioration. In microcircuitry,...
incoherent
In optics, the term denoting the lack of a fixed phase relationship between two waves. If two incoherent waves are...
spectrohelioscope
An instrument similar to the spectroheliograph, but having a scanning method that is performed by a pair of rapidly...
synchronous transmission
A mode of transmission whereby the sending and receiving stations operate continuously at a fixed relationship of phase and...
apparent movement
The visual perception of motion when fixed stimuli are exposed in rapid temporal and spatial succession.
semitransparent and p-phase annular aperture
An aperture consisting of a semitransparent central region whose amplitude transmittance only is varied, and the relative...
pigtail
A short length of optical fiber permanently fixed to a component and used to couple power between it and the transmission...
plane-polarized light
A light beam whose electric vectors all vibrate in a single fixed plane.
anomaloscope
An optical instrument that uses a yellow light of varying intensity with red and blue lights of fixed intensity to test for...
neuromorphic vision sensor
A neuromorphic vision sensor is a type of imaging device designed to mimic the structure and functioning of the human visual...
microfilm camera
A camera used to reduce originals onto film for easy storage. There are two basic types: one in which the film is fixed...
time constant
The amount of time needed for a detector signal or electronic circuit to reach 63 percent of its final value after a fixed...
optical encoder
A device designed to measure linear or rotary motion by detection of the movement of markings on a transparent medium past a...
line-scan recording
A type of recording in which the recording line remains fixed and the recording medium is fed past the recording device.
infrared scanner
An optical system used to collect infrared energy from a scene using scanning optics with a point or line detector, as...
variable-focus condenser
An Abbe condenser in which the upper lens element is fixed. The lower lens may focus the illumination between the elements...
histochemical staining
Histochemical staining is a laboratory technique used in biology and medicine to visualize specific chemical components...
zoom lens
An optical system of variable focal length, the focal plane remaining in a fixed position. This result is achieved by moving...

(66 results found)

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