Difference between revisions of "Expendable bathythermograph"

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<div class="definition"><div class="short_definition">(Abbreviated XBT.) A device for obtaining a record of [[temperature]]  as a function of depth to 1800 m from a ship with a speed as high as 15 m s<sup>&minus;1</sup>. </div><br/> <div class="paragraph">Temperature is measured with a [[thermistor]] within an expendable casing. Depth is determined  by a priori knowledge of the rate at which the casing sinks and the time of each recorded data  value. A fine wire provides a data transfer line to the ship for shipboard recording. Airborne versions  ([[AXBT]]) are also used; these use radio frequencies to transmit the data to the aircraft during  deployment. <br/>''See'' [[conductivity&ndash;temperature&ndash;depth profiler]].</div><br/> </div>
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<div class="definition"><div class="short_definition">(Abbreviated XBT.) A device for obtaining a record of [[temperature]]  as a function of depth to 1800 m from a ship with a speed as high as 15 m s<sup>-1</sup>. </div><br/> <div class="paragraph">Temperature is measured with a [[thermistor]] within an expendable casing. Depth is determined  by a priori knowledge of the rate at which the casing sinks and the time of each recorded data  value. A fine wire provides a data transfer line to the ship for shipboard recording. Airborne versions  ([[AXBT]]) are also used; these use radio frequencies to transmit the data to the aircraft during  deployment. <br/>''See'' [[conductivity&ndash;temperature&ndash;depth profiler]].</div><br/> </div>
 
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Latest revision as of 15:11, 20 February 2012



expendable bathythermograph

(Abbreviated XBT.) A device for obtaining a record of temperature as a function of depth to 1800 m from a ship with a speed as high as 15 m s-1.

Temperature is measured with a thermistor within an expendable casing. Depth is determined by a priori knowledge of the rate at which the casing sinks and the time of each recorded data value. A fine wire provides a data transfer line to the ship for shipboard recording. Airborne versions (AXBT) are also used; these use radio frequencies to transmit the data to the aircraft during deployment.
See conductivity–temperature–depth profiler.