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An Electromagnetic Log, sometimes called an "EM log", is an electronic sensor which measures the speed of a vessel through sea water. Like many other technologies, its name derives from the traditional chip log. It makes use of Faraday's law of induction by measuring the EMF induced in water moving through a magnetic field generated by the sensor.
An acoustic doppler current profiler (ADCP) is a hydroacoustic device that measures water current velocities using sound waves. Learn about its working principle, processing methods, applications, and features such as bottom tracking, discharge measurements, wave measurements, and turbulence estimation.
A pitometer log is a device that measures a ship's speed relative to the water. It works by measuring the difference in pressure between the dynamic and static water, and converting it to speed using Bernoulli's principle.
A chip log, also called ship log, is a device that measures the speed of a vessel through water by counting the knots on a line. Learn about its history, construction, use, and modern alternatives.
Well logging is the practice of making a detailed record of the geologic formations penetrated by a borehole. Learn about the different types of well logs, how they are used in various industries, and how they evolved from the invention of electric well logging in 1927.
A data logger is an electronic device that records data over time or about location with a built-in instrument or sensor or via external instruments and sensors. Learn about the standardization, protocols, formats, and examples of data loggers for various purposes.
Learn how fast sound waves travel in different media, such as air, water, and solids, and how the speed depends on temperature, frequency, and pressure. Explore the history of measuring the speed of sound and the basic concepts of sound transmission.
Depth sounding is the technique of measuring the depth of a body of water using a lead and line or an echo sounding device. Fathom is a unit of depth equal to six feet and is used in nautical charts to show the depth of the seabed.
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