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21 terms
Photonics Dictionary: F
Clear All Filters x
scans x
F x
f-Theta lens
An f-theta lens, also known as an f-theta scan lens or simply an f-theta lens system, is a specialized optical component used in laser scanning systems, particularly in laser marking, engraving, and...
facsimile machine
A device used to transmit and receive images that have been converted to electrical signals over regular telephone lines; it includes a scanner, a transmitter, a receiver and a printer.
facsimile synchronizing
The maintenance of the same scanning relationship between the transmitting scanning spot and receiving scanning spot for each scanning line transmitted in a facsimile system.
facsimile
The reproduction of a picture or image, produced by scanning the image and converting it into electrical signals that carry the image to be reproduced. Also known as fax.
FASTAR
frequency angle scanning, tracking and ranging
fax
->
facsimile
The reproduction of a picture or image, produced by scanning the image and converting it into electrical signals that carry the image to be reproduced. Also known as fax.
Felgett advantage
The signal-to-noise ratio (SNR) obtained with a Fourier transform spectrometer when detector noise prevails, which exceeds the SNR of a scanning spectrometer in the same time by a factor proportional...
fiber optic scanner
A scanner in which a fiber optic assembly replaces a lens system.
field
1. In raster scan television, one of the two scans that are interlaced to make up a frame. 2. See field of view.
field frequency
->
field repetition rate
The number of fields scanned per second in a television system. The US standard is 60. Also called field frequency.
field repetition rate
The number of fields scanned per second in a television system. The US standard is 60. Also called field frequency.
film reader
A device used to scan images or information on photographic film for the subsequent relay of information.
film scanning
The process by which the light from the images of photographic film is encoded into electrical signals for video transmission.
flatbed scanner
An imaging device analogous to a drum scanner, but operating at greater speeds; it uses a row of sensors to traverse an image affixed to a flat surface.
flying spot microscope
A microscope that uses a flying spot scanner, directed through the eyepiece, as a light source to determine the features of a transparent specimen. The flying spot is modulated by the varying density...
flying spot scanner
A device used to scan, with a small, intensely bright spot, portions of a picture surface and to transform the original picture into a series of electrical signals. In optical character recognition,...
forward-looking infrared
A night-vision device that uses one or more infrared transducers to scan a scene in the 3- to 5-µm or 8- to 12-µm spectral region, convert the infrared radiation to electronic data and...
frame
1. To center an image or place it in any part of the television screen desired. Also applies to stills. 2. A single image of the connected multiple images on motion-picture film. 3. The size of the...
frame frequency
The number of times per second that the frame of a television system is completely scanned. In the United States, 30 per second is the standard frame frequency.
framer
A device that permits the adjustment of facsimile transmitters and recorders so that their scanning lines stop and start at the same place in relation to the subject copy.
FSS
flying spot scanners
Photonics Dictionary
F
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