Sensors & Transducers Journal
(ISSN: 2306-8515, e-ISSN 1726-5479)
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Vol. 207, Issue 12, December 2016, pp. 44-49
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Vector Magnetometer Application with Moving Carriers
Andrii Prystai, Valery Korepanov, Fedir Dudkin and Borys Ladanivskyy
LLC Laboratory for Electromagnetic Innovations (LEMI), 5-A Naukova Str., Lviv, 79060, Ukraine Tel.: + 380322639163, fax: + 380322639163
E-mail: vakor@isr.lviv.ua
Received: 5 November 2016 /Accepted: 5 December 2016 /Published: 30 December 2016 |
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Abstract:
In magnetic prospecting the aeromagnetic survey is a widespread method
used for research in large territories or in the areas with difficult access (forests, swamps,
shallow waters). At present, a new type of mobile carriers – remotely piloted vehicles or drones
– is becoming very common. The drones supplied by magnetometer can be also used for
underground utility location (for example, steel and concrete constructions, buried power cables,
to name a few). For aeromagnetic survey, obtaining of 3-component magnetic field data gives
higher processing precision, so the fluxgate magnetometers (FGM) seem to be the most
preferable by reason of low weight, noise, power consumption and costs. During movement of
FGM fixed to a drone practically permanent attitude changes in the Earth’s magnetic field arises
with corresponding changes of its projection at FGM axes. Also the electromagnetic interference
from the drone motor and uncontrolled oscillations of drone and suspension are the factors which
limit the magnetometer sensitivity level. Aroused because of this, signals significantly exceed
the expected signals from a studied object and so should be removed by proper interference
filtration and use of stabilized towed construction, as well as at data processing. To find the
necessary resolution threshold of a drone-portable FGM, the modeling was made to estimate
magnetic field value from a small sphere about 1 cm radius at the minimal altitude of drone
flight and it was shown that such a small object can be reliably detected if the FGM noise level is
less than 0.15 nT. Next requirement is the necessity to decrease as much as possible the FGM
power consumption with retention of low noise level. Finally, because of drone movement, the
broadening of a frequency range should be done. The LEMI-026 magnetometer was developed
satisfying all requirements to the drone-mounted device. The field tests were successfully
performed using two of LEMI-026 magnetometers and it was concluded that the parameters of
these magnetometers allow their using for the magnetic survey with moving
platforms.
Keywords: Drone, Flux-gate magnetometer, Aeromagnetic survey, Modeling, Test results.
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