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Experimental Dosimetry
Published in Ben Greenebaum, Frank Barnes, Bioengineering and Biophysical Aspects of Electromagnetic Fields, 2018
The principle behind the search-coil magnetometer is Faraday’s law of induction. This law states that if the magnetic flux through a coiled conductor changes, a voltage proportional to the rate of change of the flux (ϕ) is generated between the leads: V(t)=−dϕ/dt
Attitude Sensors
Published in Chingiz Hajiyev, Halil Ersin Soken, Fault Tolerant Attitude Estimation for Small Satellites, 2020
Chingiz Hajiyev, Halil Ersin Soken
Search-coil magnetometer works based on the Faraday’s law of magnetic induction. It comprises copper coils that are wrapped around a magnetic core. The core gets magnetized by the magnetic field lines produced inside the coils. The fluctuations in the magnetic field results with the flow of electrical current and induces a time-varying voltage. This voltage is measured and recorded by the magnetometer.
Plasma Waves Around Comets
Published in IETE Technical Review, 2022
The Institute of Space and Astronautical Science of Japan launched Sakigake on 7 January 1985 which made a flyby of comet Halley from 7 × 106 km and had a number of plasma and magnetic field observation instruments onboard such as Plasma Wave Probe (PWP), Fluxgate magnetometer to measure the interplanetary magnetic field (IMF), solar wind ion detector (SOW). The PWP was composed of two detectors – a 10 m tip-to-tip antenna and a search-coil magnetometer. The PWP also had a swept frequency receiver which analyzed the signal in 125 frequency steps from 4 to 195 kHz with a bandwidth of 1 kHz in all frequency ranges, and a 16-channel frequency analyzer (ELF, extremely low frequency) having 100 Hz constant bandwidth [44].
Alfvèn wave Detection at first Lagrangian Point with Magnetic Field Measurements*
Published in IETE Technical Review, 2020
In the above-described cases, the correlation is not exact as the measurements are with fluxgate rather than the search-coil magnetometer which could have given the exact matching as in fluxgate magnetometer observations the small variation signatures get averaged out. However, these correlations of ∼0.7 and 0.8 provide another evidence of the presence of plasma (Alfvèn) waves at the L1 point. To measure the plasma wave characteristics, additional and scientific information is required such as oscillating electric field measurements.