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8,289 terms
Photonics Dictionary
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CCIR
Comité Consultatif International des Radiocommunications
CCITT
Comité Consultatif International Telegraphique et Telephonique
CCL
controlled commodities list
CCO
current-controlled oscillation
CCP
computer-controlled polisher
CCTV
closed-circuit television
CCW
counterclockwise
cd
candela
CD-ROM (compact disc read-only memory)
An adaptation by Philips and Sony of their audio compact disc technology for optical disc data storage and retrieval. Current capacity of a disc is 0.5 to 0.6 gigabytes of information.
CD-ROM
compact disc read-only memory
CD/I
compact disc/interactive
CD/I
A technical specification for a consumer product drawn up by Sony and Philips. CD/I combines audio, video and text recorded as interleaved channels on a disc similar to an audio compact disc. The...
CDA
cesium dideuterium arsenate
CDEM
continuous dynode electron multiplier
CDRH
Center for Devices and Radiological Health
CDRM
compensating digital readout multiplexer
CDS
cinema digital sound; conjugate direction search; correlated double sampling
CDU
control display unit
CEI
computer extended instruction
cell
1. A single unit in a device for changing radiant energy to electrical energy or for controlling current flow in a circuit. 2. A single unit in a device whose resistance varies with radiant energy....
cell adhesion
Cell adhesion refers to the process by which cells interact and attach to neighboring cells or to the extracellular matrix (ECM), a network of proteins and other molecules surrounding cells. This...
cell migration
Cell migration refers to the process by which cells move from one location to another within tissues or across biological barriers. This fundamental biological process is essential during various...
CEM
channel electron multiplier
cement
An adhesive used for bonding optical elements or for holding devices.
cemented doublet
->
doublet
1. A compound lens consisting of two elements. If there is an air space between the elements it is called an "air-spaced doublet.'' If the inner surfaces are cemented together, it is called a...
cementing surface
The surface of an element of a compound lens that will produce the cemented interface. The curves of this interface are called inside curves. To facilitate cementing, the two inside curves should...
center of curvature
The center of the sphere of which the surface of a lens or mirror forms a portion. Each curved surface of a lens has a center of curvature; the surfaces may be convex or concave.
center of perspective
That viewpoint at which the angular subtenses of points in the picture are identical to angular subtenses of the original points in the scene, at the camera lens.
center thickness
The lens thickness measured at the optical axis.
center, optical
->
optical center
The point on the optical axis of a lens that is the image of the nodal points. For any bundle of rays passing through the optical center of a lens, the incident and emergent rays through this point...
centerburst
In an interferogram, an intense portion of the recording that corresponds in size to the amount of infrared radiation incident on the detector.
centered curve
The surface curvature designed to reduce the marginal error found in the periphery of a spectacle lens.
centering
1. Mounting a lens or mirror so that its optical axis is coincident with the optical or mechanical axes of other portions of the system. 2. The machining (edging) of the outside diameter of a lens...
centi
In the SI system, prefix meaning one hundredth, 10-2.
central obstruction
In a reflecting telescope, the obstruction of the primary mirror by a secondary mirror which blocks a small amount of the light reflected by the primary mirror and introduces additional diffraction.
central processing unit
The computer module whose circuitry interprets instructions and guides the actions of the peripherals. Also known as the mainframe.
centration
Centration is the precise alignment of the optical center of a lens or optical element with its mechanical center or the axis of the mounting assembly. It is crucial for ensuring that the optical...
centrifuge
A rotating chamber that can be spun at different speeds to generate great radial forces used to simulate different gravity loads.
centrifuge microscope
A microscope that can be used to observe and magnify microscope specimens while they are being centrifuged. The objective rotates near the periphery of the centrifuge head, and the ocular is...
centroid
->
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 at the intersection of all of the hyperplanes of symmetry within that...
CER
contactless electroreflectance
ceramics
In optics and photonics, ceramics refer to advanced ceramic materials that possess unique optical properties, making them suitable for various applications involving the manipulation and control of...
Cerenkov counter
An instrument that detects high-energy charged particles by analysis of the Cerenkov radiation that they emit.
Cerenkov radiation
The radiation produced when a charged particle traverses a medium that has a refractive index considerably greater than unity. The moving particle has a velocity that exceeds the velocity of light in...
cerium oxide
A polishing material that has a quicker polishing action than rouge (ferric oxide) and that is cleaner to handle.
CERN
European Organization for Nuclear Research
cesium 134
An isotope of cesium that emits negative beta particles and has a half-life of 2.19 years; its applications include photoelectric cells and developmental ion propulsion systems.
cesium chloride
Colorless crystals used in photoelectric cells and for photosensitive material in cathodes.
cesium oxide cell
A photoemissive detector sensitive to wavelengths up to 1 µm. It has one sharp maximum of sensitivity at 350 nm and a broad maximum at 800 nm.
cesium phototube
A phototube having a cesium-coated cathode that has its greatest sensitivity in the infrared region.
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Photonics Dictionary
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