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| Electromagnetic log ： ウィキペディア英語版 |
Electromagnetic log
An Electromagnetic Log, sometimes called an "EM Log", measures the speed of a vessel through water.
It operates on the principle that:
1 when a conductor (such as water) passes through an electromagnetic field, a voltage is created and
2 the amount of voltage created increases as the speed of the conductor increases.
The process is
# the EM Log creates an electromagnetic field.
# a voltage is induced in the water; the magnitude of the voltage varies depending upon the speed of the water flow past the sensor.
# the EM Log measures the voltage created and translates this into the vessel's speed through water.
== Advantages ==
* No moving parts
* cheaper
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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