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Magnetic Field Sensors

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About Magnetic Field Sensors

Magnetic field sensors are used to measure magnetic flux and/or the strength and direction of a magnetic field. They are used mainly in scientific measurement, navigation, and industrial applications. Magnetic field sensors use several types of sensing technologies. Magnetoresistive devices measure electrical resistance as a function of the applied or ambient magnetic field. Flux gate or coil sensors measure differences in the magnetic field at the ends of a vertical rod and then plot this information on a grid. Hall Effect sensors convert the energy stored in a magnetic field to an electrical signal by developing a voltage between the two edges of a current-carrying conductor whose faces are perpendicular to a magnetic field. Magnetoinductive sensors consist of a coil that surrounds a ferromagnetic core whose permeability changes within the earth's magnetic field.  Proton precession devices use liquids such as kerosene and methanol that have high densities of hydrogen atoms. Overhauser or nuclear precession devices combine an electron-rich liquid with hydrogen and subject the mixture to a radio frequency (RF) signal. Optically-pumped sensors polarize a gaseous alkali with a specific wavelength of light. Superconducting quantum interference devices (SQUID) are very sensitive to low magnetic fields.

Selecting magnetic field sensors requires an analysis of performance specifications. Flux density, the total measurement range in gauss (G), often corresponds to the linear output region of the sensing technology. Resolution, another important specification, is the smallest measurable increment. Accuracy is a percentage of full-scale. Bandwidth is the frequency range over which magnetic field sensors meet their accuracy specifications. The number of axes indicates the number of possible, simultaneous measurements for magnetic field sensors. Single-axis devices are common, but two-axis and three-axis devices are also available. Directional magnetic field sensors measure the direction of the magnetic field and may provide bipolar outputs. Magnitude sensors measure the magnitude of the magnetic field. Maximum shock, maximum vibration and operating temperature are additional specifications.  

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Products & Services Related to Magnetic Field Sensors

Magnetic Field Instruments
Magnetic field instruments include meters, gauges, recorders and other instrumentation for the measurement of magnetic fields and/or magnetic flux.

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Engineering Web: Magnetic Field Sensors

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MATLAB Central - Files
chemistry field graph ion accelerator data analysis application plasma magnetic flux b ips 120 loop magnet magnetic magnetic actuators magnetic field
See MathWorks, Inc. (The) Information
Magnetic Field Sensors
Capacitive Sensors Magnetic Field Sensors magnetic field sensors Overview Product Selector
Bartington Instruments: Bartington Instruments - Home page
Three-Axis Fluxgate Magnetometers Magnetic field sensors for three-axis measurement up to 1mT, and from DC to 12kHz.
See Bartington Instruments, Ltd. Information
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Part Numbers for Magnetic Field Sensors

Part # Distributor Manufacturer Product Category Description
HFIELDEV Digi-Key Microchip Technology Programmers, Development Systems BOARD EVAL MAGNETIC H-FIELD

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