grid (redirected from focused grid)

grid: see electron tube.

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grid

(1) Any interconnected set of nodes such as the electric power network or a communications network.

(2) "The Grid" is a nickname for Internet2. See Internet2.

(3) In a vacuum tube or gas-filled electron tube, the grid is a perforated electrode through which electrons may pass. The term typically refers to the control grid in a triode, tetrode or pentode vacuum tube. In these cases, the grid is used to control the amount of current flow between the cathode and plate (anode). As the voltage potential is varied on the control grid, the amount of current allowed to pass through also varies. Relatively small fluctuations in the grid's potential can control substantially larger amounts of current flow through the tube. This phenomenon is referred to as "gain." Tetrodes and pentodes use additional grids to regulate current flow and effect gain. See screen grid and suppressor grid.

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grid

1. a network of horizontal and vertical lines superimposed over a map, building plan, etc., for locating points

2. the grid the national network of transmission lines, pipes, etc., by which electricity, gas, or water is distributed

3. Electronics

a. an electrode situated between the cathode and anode of a valve usually consisting of a cylindrical mesh of wires, that controls the flow of electrons between cathode and anode

b. (as modifier): the grid bias

4. See starting grid

5. a plate in an accumulator that carries the active substance

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grid [grid]

(computer science)

In optical character recognition, a system of two groups of parallel lines, perpendicular to each other, used to measure or specify character images.

(design engineering)

A network of equally spaced lines forming squares, used for determining permissible locations of holes on a printed circuit board or a chassis.

(electricity)

A metal plate with holes or ridges, used in a storage cell or battery as a conductor and a support for the active material.

Any systematic network, such as of telephone lines or power lines.

(electronics)

An electrode located between the cathode and anode of an electron tube, which has one or more openings through which electrons or ions can pass, and serves to control the flow of electrons from cathode to anode.

(mapping)

A system of uniformly spaced perpendicular lines and horizontal lines running north and south, and east and west on a map, chart, or aerial photograph; used in locating points.

(medicine)

Potter-Bucky grid

(mining engineering)

Imaginary line used to divide the surface of an area when following a checkerboard placement of boreholes.

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grid

1. See gridiron.

2. See grillage.

3. In surveying, closely-spaced reference lines which are perpendicular to each other; elevations usually are taken at the intersections of these lines.