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21 terms
Photonics Dictionary: G
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GaAlAs laser
A GaAlAs laser is a type of semiconductor laser diode that emits light in the near-infrared region of the electromagnetic spectrum. It is composed of layers of gallium, aluminum, and arsenic, hence...
galvanometer
A galvanometer is an instrument used for detecting and measuring small electric currents. It typically consists of a coil of wire suspended in a magnetic field, with a pointer attached to the coil....
gamma radiography
Radiography using the emission of gamma rays to form an image of the structure penetrated by the radiation.
GASP
graphic applications subroutine package
GC
gas chromatography
GCMS
gas chromatography and mass spectroscopy
GEDI lidar
The global ecosystem dynamics investigation (GEDI) lidar is a state-of-the-art spaceborne instrument designed to study Earth's forests and ecosystems in three dimensions. Developed by NASA, GEDI is...
glass film plates
An early form of photographic media consisting of glass plates coated with an emulsion.
glass spectrograph
A spectrograph having glass as its refracting component and used in cases where speed and high dispersion are not required. The glass material has a range of about 3700 to 8000 Å.
Golgi Staining Technique
The Golgi staining technique (also called the black reaction) makes it possible to look at the nervous system by rendering neurons visible under light microscopy. After a long process involving...
goniophotometric curve
The graphed curve illustrating the directional reflectance of a sample for different angles of collection.
GPC
graphics performance characterization
graphecon
An electron tube having two electron guns, one on each side of the storage medium, to encode the information onto the medium, and to read and simultaneously erase the electrostatic encoding.
graphene
Graphene is a two-dimensional allotrope of carbon consisting of a single layer of carbon atoms arranged in a hexagonal lattice pattern. It is the basic building block of other carbon-based materials...
grating spectrograph
->
spectrograph
An optical instrument for forming the spectrum of a light source and recording it on a film. The dispersing medium may be a prism or a diffraction grating. A concave grating requires no other means...
grenz rays
The soft x-rays used in the industrial radiography of materials having too small a range of densities to produce an image with normal x-rays.
GSC
gas-solid chromatography
GSP
graphics system processors
GUI
graphical user interface
guide factor
A factor derived by equating the incident light on the subject to the required incident light for suitable photography. The lamp-subject-distance then is multiplied by the aperture and solved in...
gun camera
A camera accurately aligned to a weapons system to provide a photographic record of system performance.
Photonics Dictionary
G
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