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altimeter

altimeter (ăltĬm´Ĭtər, ăl´tĬmē´tər), device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear elevation as an airplane, balloon, or mountain climber rises. It shows height above sea level, but not above such land features as hills, mountains, and valleys. The radio altimeter, or terrain-clearance indicator, is an absolute altimeter; it indicates the actual altitude over water or over terrain, however uneven. It operates by first sending either continuous or pulse radio signals from a transmitter in an aircraft to the earth's surface. A receiver in the aircraft then picks up the reflection of the signals from the surface. The time it takes for the signals to travel to the earth and back is converted automatically into absolute altitude that can then be read from a calibrated indicator. The radio altimeter is used in the automatic landing systems of aerospace vehicles; systems developed from radio altimeters can automatically control military aircraft flying at high speeds and low altitudes.

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"altimeter." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"altimeter." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/altimeter

"altimeter." The Columbia Encyclopedia, 6th ed.. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/altimeter

altimeter

altimeter Instrument for measuring altitude. The simplest type is a form of aneroid barometer. As height increases, air pressure decreases, so the barometer scale can be calibrated to show altitude. Some aircraft have a radar altimeter, which measures the time taken to bounce a radar signal off the ground.

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"altimeter." World Encyclopedia. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"altimeter." World Encyclopedia. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/altimeter

"altimeter." World Encyclopedia. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/altimeter

altimeter

al·tim·e·ter / alˈtimitər/ (abbr.: alt.) • n. an instrument for determining altitude attained, esp. a barometric or radar device used in an aircraft.

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"altimeter." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"altimeter." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/altimeter-0

"altimeter." The Oxford Pocket Dictionary of Current English. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/altimeter-0

altimeter

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"altimeter." Oxford Dictionary of Rhymes. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"altimeter." Oxford Dictionary of Rhymes. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/altimeter

"altimeter." Oxford Dictionary of Rhymes. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/altimeter