DocumentCode :
1406079
Title :
Duality of the electric covering fieldmill and the fluxgate magnetometer
Author :
Kaplan, Ben-zion ; Suissa, Uri
Author_Institution :
Dept. of Electr. & Comput. Eng., Ben-Gurion Univ. of the Negev, Beer-Sheva, Israel
Volume :
34
Issue :
4
fYear :
1998
fDate :
7/1/1998 12:00:00 AM
Firstpage :
2306
Lastpage :
2315
Abstract :
This work treats two dc field sensors. The first sensor is the “covering fieldmill” that is employed to measure dc electric fields. The second sensor is the “fluxgate magnetometer” that is utilized to measure dc magnetic fields. An unusual approach is suggested to deal with the devices evaluation. It is shown that both devices can be associated with related ac field sensors-electric and magnetic. This association leads to modeling the dc sensors by Thevenin circuit models. It is then shown that in both cases the coupling between the sensors output circuitry and the measured field sources is due to series time-varied reactances. This enables a similar analytical treatment to both devices. Furthermore, it is also suggested that both sensors are related to the large family of antennas. As a result, an unusual way is found to relate the sensors output signal to the measured field. It is well known that the signal in electric antennas is related to the measured field times the effective antenna length. It is therefore relatively easily acceptable that also in the dc electric sensor case a similar relationship holds. The work, however, suggests that this relationship (that non relates the output signal to the measured dc magnetic field times the effective magnetic structure length) also holds in the fluxgate magnetometer case. An extension of this result is useful when attempting to measure nonuniform dc magnetic fields and is treated toward the end of the paper
Keywords :
duality (mathematics); electric field measurement; electric sensing devices; fluxgate magnetometers; DC electric field sensor; DC magnetic field sensor; Thevenin circuit model; antenna; electric covering fieldmill; electromagnetic duality; fluxgate magnetometer; Antenna measurements; Coupling circuits; Electric fields; Electric variables measurement; Length measurement; Magnetic analysis; Magnetic devices; Magnetic field measurement; Magnetic sensors; Magnetometers;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.703870
Filename :
703870
Link To Document :
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