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8,289 terms
Photonics Dictionary
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IRST
infrared search and track
ISA
Instrument Society of America
ISDN
integrated services digital network
ISDP
integrated signal and data processor
Ishihara test
->
color perception test equipment
Equipment for testing an observer's color vision. Some tests require the identification or ordering of colored samples. The commercially available examples include: the Ishihara plates, on which...
ISI
infrared signature imaging
ISIT
intensified silicon intensifier target
ISL
intersatellite link
ISO
International Standards Organization
isobar
One of a number of nuclides characterized by an identity between their mass numbers, but each having a different atomic number.
isocandela diagram
Indication of emission brightness with degree of emission from an optical source.
isochromatic
Having the same chromaticity or color.
isochromatic lines
1. Lines of the same color. 2. A term used in photoelastic stress analysis to refer to the interference fringes produced in birefringent materials.
isocon
->
image isocon
A television camera tube that preceded the development of the vidicon tube and incorporated a method to separate reflected and scattered portions of the return beam so that only the scattered...
isodivs
A graphic depiction of the loci of all points in space relative to a laser transmitter at a specific altitude.
isogyric curves
With respect to the effect of crystals on lightwaves, the family of curves having constant direction of polarization.
isolator
In the context of electronics and optics, an isolator refers to a device that allows the transmission of signals in one direction while attenuating or blocking signals in the opposite direction. The...
isoperibol enclosure
An enclosure for a calorimeter that allows measurement of unusually low quantities of power and energy.
isophote
A curve or surface having equivalent light intensity.
isophotometer
A direct recording photometer that is designed to scan a photographic negative to determine its points of isodensity.
isoplanatic
Free of coma.
isopreference curves
Graphic representation of quantified values of image quality whose points all refer to images that are of a constant subjective quality.
isosorbs
Lines of equal atmospheric attenuation in a laser beam.
isotemperature line
->
correlated color temperature
Temperature of the blackbody having chromaticity nearest to that of the test source on a specified chromaticity diagram.
isotope shift
The slight difference in wavelength of an element's given spectral line observed in comparing different isotopes of that element.
isotopically selected laser spectroscopy
A spectroscopic technique in which an excitation band absorbs laser energy resulting in an electronic transition. The isotopic species may then be measured using a time of flight mass spectrometer....
isotropic
That property of a material that determines that velocity of propagation within the material is the same for all directions.
ISTM
International Society of Testing and Materials
IT
interline transfer
ITO
indium tin oxide
ITU
International Telecommunications Union
IU
international unit
IUPAC
International Union of Pure and Applied Chemistry
IVHS
intelligent vehicle highway system
IVPO
inside vapor-phase oxidation
J-T
Joule-Thomson
jacket
The outer material that surrounds and protects the buffered and unbuffered fibers in an optical cable.
Jacquinot advantage
The higher throughput obtained with an FTIR device compared with traditional spectrometers that need slits to achieve resolution. The advantage differs according to wave number and resolution.
Jamin refractometer
An instrument designed to measure the index of refraction of a gas by the interference patterns formed by two beams, one of which passes through a vacuum tube in which the gas is slowly released.
jellet prism
A prism produced by severing a Nicol prism and reconstructing the polarization angles of the two halves so that they are slightly wedged toward each other.
jet-streamed dye laser
A continuous-wave dye laser that uses a circulation pump and nozzle to provide an optically flat stream of dye across the laser's optical axis.
JIAWG
joint integrated avionics working group
jig
A device to hold and locate a workpiece as it guides, controls or limits a cutting tool.
jig allowance
Also called coating jig allowance. That margin on an optical component that is outside the clear aperture for use in holding the component in the optical thin-film coater tooling during the...
JIS
Japan Industrial Standards
JIT
just in time
jitter
1. In relation to cathode-ray tube displays, errors in the signal's amplitude, phase or both that result in small, rapid aberrations in size or position of the image. 2. Errors of synchronization...
Josephson effect
Characteristic of radiation detectors that produce energy that is similar to the energy of superconductive gaps when interacting with photons.
joule
A unit of energy or work in the MKS system of units. One joule is equal to 107 ergs.
Joule-Thomson cooler
A detector cooling device in which a gas under high pressure escapes through an expansion valve in the tank; as the escaped gas liquefies, it cools the site of the sensor.
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Photonics Dictionary
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