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Topic: Magnetometer

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In the News (Tue 23 Jul 19)

  Cassini-Huygens: Spacecraft-Instruments-Dual Technique Magnetometer (MAG)
Because magnetometers are sensitive to electric currents and ferrous metal components, they are generally placed on an extended boom, as far from the spacecraft as possible.
The magnetometer electronics are located in a bay in the Cassini orbiter's spacecraft body.
The Dual Technique Magnetometer (MAG) is a Direct Sensing Instrument (think smell or taste) that measures the strength and direction of the magnetic field around Saturn.
saturn.jpl.nasa.gov /spacecraft/instruments-cassini-mag.cfm   (894 words)

  Magnetometer Summary
Magnetometers are very sensitive, and can give an indication of possible auroral activity before one can even see the light from the aurora.
One type of magnetometer is the proton precession magnetometer, which operates on the principle that protons are spinning on an axis aligned with the magnetic field.
A basic example of the workings of a magnetometer may be given by discussing the common "optically pumped cesium vapour magnetometer" which is a highly sensitive (0.004 nT/√Hz) and accurate device used in a wide range of applications.
www.bookrags.com /Magnetometer   (1521 words)

  Cryogenic High-Sensitivity Magnetometer
The SQUID magnetometer would be used to measure the change in current in the coil as a result of the change in temperature measured by the germanium resistance thermometer.
In an alternative version of this magnetometer, for operation at a temperature near the high end of the cryogenic range, the coil and the SQUID magnetometer would be made from a high-temperature superconductor and the coil would be in the form of a thin film deposited on the same substrate as that of the SQUID.
While conventional SQUID magnetometers are routinely used to measure the change in magnetic flux density with similar sensitivity, the proposed implementation allows the full sensitivity of SQUID to be used to measure a small static magnetic flux density.
www.nasatech.com /Briefs/Jun05/NPO40748.html   (518 words)

 Dan's Homegrown Proton Precession Magnetometer Page
A magnetometer is an instrument used to measure the strength of a magnetic field.
Magnetometers are used to measure variations in the earth's magnetic field in order to locate mineral deposits, achaeological sites, buried treasure, or submerged objects such as submarines or shipwrecks.
The proton precession magnetometer operates on the principal that the protons in all atoms are spinning on an axis aligned with the magnetic field.
www.portup.com /~dfount/proton.htm   (1752 words)

 Activity 39: Field Use of a Magnetometer - Maine Geological Survey
Magnetometers are sensitive to any nearby objects that have magnetic properties; even weakly magnetic buried objects may be easily located.
Magnetometers are routinely used to locate underground water and gas pipes, culverts, sewer pipes, and storage tanks such as those used for petroleum products.
If your school does not have a magnetometer you may be able to borrow one from a local water district, geophysical firm, surveying company, or state agency.
www.maine.gov /doc/nrimc/mgs/education/lessons/act39.htm   (864 words)

 Magnetometer - the History
The magnetometer is an Instrument for measuring the strength and sometimes the direction of magnetic fields, including those on or near the Earth and in space.
Magnetometers are also used to calibrate electromagnets and permanent magnets and to determine the magnetization of materials.
Magnetometers specifically used to measure the Earth's field are of two types: absolute and relative (classed by their methods of calibration).
www.ctsystems.org /gauss.htm   (5592 words)

 Galileo Magnetic Field Investigation Instrument Document
Magnetometer measurements are central to accomplishment of some of the primary objectives of the mission.
The magnetometer has a separate electronics box containing digital and analog electronics and power supplies, located in electronics Orbiter bay number three, and two flipper assemblies and their ring core sensors mounted on a boom or 'astromast' deployed from a canister mounted on the science boom.
Because of a mismatch between the instrument and spacecraft clock cycles, the magnetometer data received from the spacecraft in the low-rate science mode are not equispaced.
www.igpp.ucla.edu /galileo/doc/ssr60/mag.htm   (0 words)

A three-axis fluxgate magnetometer can measure the asteroid's magnetic field from DC to 10 Hz.
The sensor head is mounted on the high gain antenna feed, while the electronics are mounted on the spacecraft top deck.
The magnetometer has an internal calibration coil that can be exercised by command.
near.jhuapl.edu /instruments/MAG/index.html   (121 words)

 The Magnetometer
Magnetometers are devices used to detect and measure the strength of magnetic fields.
Have students use their magnetometer to find things in your room or at home that are magnetic.
Have students tackle these exercises which will have them utilize their magnetometers: Terrabagga Activity and Magnetometer Extensions.
www.windows.ucar.edu /tour/link=/teacher_resources/magnetometer_edu.html   (0 words)

 MAG - Magnetometer
A basic set of measurements for fields and particles science is the determination of the strength and direction of the magnetic field within the magnetosphere.
One set is located at the end of the magnetometer boom and, in this position, is about 11 meters from the spin axis of the spacecraft.
The inboard sensor is mounted on the magnetometer boom at 6.87 m, and the outboard sensor is on the end of the boom at 11.03 m from the spacecraft spin axis.
www2.jpl.nasa.gov /galileo/instruments/mag.html   (539 words)

 Magnetometer   (Site not responding. Last check: )
Magnetometers are what scientists use to measure magnetic fields of planets and asteroids.
The word magnetometer is a combination of two words, "magnetic" and "meter".
The magnetometer was used to measure the strength and direction of the magnetic field on the asteroid Eros.
set.lanl.gov /programs/lasso/LASSOTchr/quest/lori/Magnetometer.html   (341 words)

 IAU-DTU Space Magnetometer Group - Publications
The rotation matrix between the magnetometer orthogonalized axes and the star camera optical axes was determined from the observed stellar coordinates related to the Earth magnetic field from the Magnetic Observatory.
Averages of the magnetometer readings in each position were related to the field magnitudes from the Observatory, and a least squares fit for the 9 magnetometer calibration parameters was performed (3 offsets, 3 scale values and 3 inter-axes angles).
Proton free or forced precession magnetometers are at the focus as calibration references, because the proton gyromagnetic ratio is a basic atomic constant for the SI units of magnetic and electric current.
server4.oersted.dtu.dk /research/CSC/publica   (6890 words)

 High sensitivity potassium magnetometer   (Site not responding. Last check: )
Feedback from the magnetometer actively adjusts the current in the coils to cancel the ambient field, allowing the atoms to remain in the regime of spin-exchange suppression.
In the presence of small magnetic fields, to first order the magnetometer signal is linear in the field component that is orthogonal to both the pump and probe beams.
A mock-up of the magnetometer showing the active cell, the pump and probe beams, the beamsplitting analyzer and the segmented photodetector.
www.atomic.princeton.edu /romalis/magnetometer   (912 words)

 Magnetometer 101
A magnetometer is an instrument for measuring the direction and/or intensity of magnetic fields.
Existing magnetometers that use purely electronic detection (Hall, magneto-resistance, or flux-gate devices) have sensitivities limited by their electronic Quality Factor (“Q-factor”) that depends on the electrical resistance or friction of the electrons traveling through the metal in the circuit; it is difficult to reduce this factor (and increase sensitivity) for room-temperature operations.
In military applications, for example, the proposed magnetometer may be able to detect the presence of a solider carrying a rifle at approximately 150 feet from a single sensor, and larger targets such as a car may be detected at 800 feet from a sensor.
www.mphasetech.com /magnetometer.htm   (926 words)

 Fluxgate Magnetometer calibration measurements
The magnetometers are particularly sensitive, and are designed to measure small fluctuations in the geomagnetic field.
The magnetometer zero field was found to correspond to a frequency of close to 68 kHz.
The horizontal axis is derived from the frequency of pulses from the magnetometer.
ourworld.compuserve.com /homepages/demerson/magnet.htm   (3033 words)

 Magnetometer Mag 505
The Magnetometer is a support instrument, ideal for searching effectively for deep buried targets made with even a small portion of steel or iron in them.
Magnetometer can be of great help because you can precisely localize deep deposits of fl magnetized sand, associated with gold deposits.
There are also other types of Magnetometers such as the cesium for example, but as a general rule, these kinds of instruments are reserved for geophysicists and can not be used by a common prospector that wants to immediately know, in a simple way, if there is a target and at what depth.
www.metaldetection.net /english/Mag505-2-Ang.htm   (1609 words)

 Fluxgate Magnetometer: Thermal Correction & Long Term Drifts
The earlier notes, Fluxgate Magnetometer tests described the Speake FGM3 series of fluxgate magnetometers, intended to be used to measure small variations of the geomagnetic field, or other small magnetic effects.
The FGM-3h magnetometer requires a stablized 5 volt supply, and gives a stream of TTL-compatible pulses, whose period is approximately proportional to the magnetic field.
For the earlier measurements, the output of the magnetomete was fed to a frequency counter (an Optoelectronics model 3000) with an RS232 interface, so that results could be logged to a computer (a dedicated 286 laptop).
ourworld.compuserve.com /homepages/demerson/magtherm.htm   (1641 words)

 Antarctic Magnetometer Project   (Site not responding. Last check: )
Since the ionosphere and magnetosphere are electrically coupled by the anisotropic behavior of the plasma in the magnetospheric field, ground magnetic observations of ionospheric phenomena made at high latitudes have become a focus for a variety of investigations.
The unmanned magnetometer systems are downloaded annually during one of the Mirny to Vostok resupply traverses.
The unmanned magnetometer systems were specifically designed to operate autonomously year around under harsh polar plateau conditions.
www.sprl.umich.edu /MIST/antarctic.html   (946 words)

 Magnetometer   (Site not responding. Last check: )
Unlike the other instruments, the magnetometer is not attached to the main body of the spacecraft.
Instead, each one of the magnetometer's two sensors sit at opposite ends of the spacecraft at the ends of Surveyor's two solar arrays.
This placement ensures that the data generated from the magnetometer sensors will not be "polluted" by the magnetic signal from the spacecraft.
mars.jpl.nasa.gov /mgs/sci/mag/mag.html   (174 words)

 Magnetometer Magnetometers Geophysics Magnetic Field Sensors Gradiometer Gradiometers
GEM Advanced Magnetometers is a proven supplier of magnetometers, gradiometers, and magnetic sensors for Earth Science, Geophysics and other applications.
With more than two decades in magnetometer, gradiometer and magnetic sensor research and development, GEM is also known for its service and support — featuring knowledgeable magnetics professionals and the
Quantum magnetometers and gradiometers are widely applied due to their ease-of-use, low cost of surveying, and data quality.
www.gemsys.ca   (0 words)

 TR2: Magnetometer
The magnetometer was designed and built by the SRP program of the University of Tokai in Japan as part of a new collaboration between the two student rocket programs.
The magnetometer will be on both TR1 and TR2 to measure the rocket's orientation.
The magnetometer is a complex board that measures the magnetic field around the rocket.
www.uaf.edu /asgp/asrp/srp3/str2magnet1.htm   (234 words)

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