Magnetometer

Feb 3rd, 2012
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An assignment on Magnetometers. - Timeline of Geomagnetism and Magnetometers - What is a Magnetometer? - Its Basic Use - Types of Magnetometers (Scalar and Vector) - Flux-gate - Proton Precession - Optically Pumped - SQUID

Word Count: 1680
Showing Page: 1/9
GEOL-508: GEOPHYSICSMAGNETOMETERS Timeline of Geomagnetism and Magnetometers100 A.D. The magnetic compass was invented in China.1180: The compass was first described in European texts by Guyot de Provins and Alexander Neckam.1576: Inclination i.e. the angle between the geomagnetic field vector and the horizontal was discovered by Robert Norman. 1600: William Gilbert noted that the variation of inclination with latitude was the same as that around a sphere of loadstone and deduced for the first time that Earth had a magnetic field.1634: From observations of the field declination in London, Henry Gellibrand concluded that the geomagnetic field changes over time.1701: Edmund Halley published the first geomagnetic field map, showing the declination throughout the Atlantic Ocean.1722: George Graham developed a compass that was sufficiently sensitive to observe the fluctuations that we now call "geomagnetic activity". 1740: The diurnal variation in that activity was first noted by Olof Hiorter. 1741: Hiorter observed large magnetic variations that were connected to local auroral displays and magnetic variations were also recorded in London by Graham. 1798: The relative intensity of the geomagnetic field at a no. of locations was measured by Alexander von Humboldt, who first described the disturbances he observed as "geomagnetic storms". His work attracted the interest of Carl Friedrich Gauss. 1828: Carl Gauss subsequently

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