Photonics Dictionary: B

Clear All Filters x tubes x B x
beam deflection tube

An electron-beam tube in which the current to an output electrode is regulated by the transverse motion of the tube's electron beam.

beam divider -> beamsplitter

A beamsplitter is an optical device for dividing a beam into two or more separate beams. A simple beamsplitter may be a very thin sheet of glass inserted in the beam at an angle to divert a portion...

beam positioner

A device (e.g., prisms, lenses, tubes) used to align a beam in a system.

beamsplitter

beryllium oxide

A dielectric ceramic material used in laser capillary tubes because of its high electrical resistivity and high thermal conductivity (half that of copper).

biplanar image tube

Also called proximity focus image intensifier. A compact image intensifier that utilizes a microchannel plate intensification stage. This is an in-line device that does not invert the image.

blanking

The process by which the raster beam in a video tube is cut off during the retracing and sync periods.

blooming

The loss of focus of a camera sensor because of excessive brightness, characterized by the enlargement of spot size and halation on a cathode-ray tube.

blown fiber

A technique developed by British Telecom in which the viscous drag of air is used to install optical fibers in narrow plastic tubes.

bolometer

A thermometric instrument used for the detection and measurement of radiant energy. Its essential component is a short narrow strip covered with a dead black absorbing coating and mounted at the...

bore

The central hole running the full length of a laser capillary tube, in which electrical discharge and laser action take place. Also a similar hole in a hollow waveguide or a microchannel plate.

borescope

A device for the internal inspection of hard-to-get-at mechanical parts, such as rifle barrels, sewer pipes, oil wells, or gas mains. The long narrow tube used contains a telescope system with as...

brightness control

The manual shifting bias control of a cathode-ray tube that determines both the average brightness and the contrast of a picture.

Btu

British thermal unit

buckyballs -> fullerenes

Molecules composed entirely of carbon, in the form of a hollow sphere, ellipsoid or tube. Also called buckyballs. Cylindrical fullerenes are called carbon nanotubes or buckytubes.

Photonics DictionaryB

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