Abstract
With an objective to develop an airborne electromagnetic survey method for greater depths achievable of exploration, a discussion was given on an exploration method of a type in which a transmitting device is placed on the ground to receive signals in an atmosphere. A prototype exploration apparatus is mounted with a fluxgate magnetometer, an attitude meter, a GPS, and a battery. This exploration apparatus is suspended on a 30 meter long rope from a helicopter to perform the exploration. Two flight tests on this apparatus were carried out in the Unzen area, Nagasaki Prefecture and the Motomiya area, Wakayama Prefecture. The ground source was extended to a distance of 1.5 km, and a current of about 20 A was flown with a quiescent wave having four-second cycles. The helicopter flew nearly horizontally at a ground speed of about 50 km, a flight altitude of 450 m above sea level, and a terrain clearances of 100 to 400 m. The obtained data had variations in correspondence with changes in roll and pitch angles, whereas the variation of about 5000 nT was reduced to about 1000 nT as a result of correction. It was not possible, however, to correct completely the variation
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Mogi, T;
Fujimitsu, Y;
[1]
Tanaka, Y;
[2]
Jomori, N;
[3]
Morikawa, T;
[4]
Kusunoki, K
[5]
- Kyushu University, Fukuoka (Japan). Faculty of Engineering
- Kyoto University, Kyoto (Japan). Faculty of Science
- Chiba Electronics Research Institute, Chiba (Japan)
- Dowa Engineering Co. Ltd., Okayama (Japan)
- Central Research Institute of Electric Power Industry, Tokyo (Japan)
Citation Formats
Mogi, T, Fujimitsu, Y, Tanaka, Y, Jomori, N, Morikawa, T, and Kusunoki, K.
Fundamental study on airborne electromagnetic survey using grounded source; Chihyo source gata kuchu denji tansa no kisoteki kenkyu. 2.
Japan: N. p.,
1997.
Web.
Mogi, T, Fujimitsu, Y, Tanaka, Y, Jomori, N, Morikawa, T, & Kusunoki, K.
Fundamental study on airborne electromagnetic survey using grounded source; Chihyo source gata kuchu denji tansa no kisoteki kenkyu. 2.
Japan.
Mogi, T, Fujimitsu, Y, Tanaka, Y, Jomori, N, Morikawa, T, and Kusunoki, K.
1997.
"Fundamental study on airborne electromagnetic survey using grounded source; Chihyo source gata kuchu denji tansa no kisoteki kenkyu. 2."
Japan.
@misc{etde_522652,
title = {Fundamental study on airborne electromagnetic survey using grounded source; Chihyo source gata kuchu denji tansa no kisoteki kenkyu. 2}
author = {Mogi, T, Fujimitsu, Y, Tanaka, Y, Jomori, N, Morikawa, T, and Kusunoki, K}
abstractNote = {With an objective to develop an airborne electromagnetic survey method for greater depths achievable of exploration, a discussion was given on an exploration method of a type in which a transmitting device is placed on the ground to receive signals in an atmosphere. A prototype exploration apparatus is mounted with a fluxgate magnetometer, an attitude meter, a GPS, and a battery. This exploration apparatus is suspended on a 30 meter long rope from a helicopter to perform the exploration. Two flight tests on this apparatus were carried out in the Unzen area, Nagasaki Prefecture and the Motomiya area, Wakayama Prefecture. The ground source was extended to a distance of 1.5 km, and a current of about 20 A was flown with a quiescent wave having four-second cycles. The helicopter flew nearly horizontally at a ground speed of about 50 km, a flight altitude of 450 m above sea level, and a terrain clearances of 100 to 400 m. The obtained data had variations in correspondence with changes in roll and pitch angles, whereas the variation of about 5000 nT was reduced to about 1000 nT as a result of correction. It was not possible, however, to correct completely the variation with short cycles, requiring further discussions on frequency characteristics of the magnetometer. 6 figs., 1 tab.}
place = {Japan}
year = {1997}
month = {May}
}
title = {Fundamental study on airborne electromagnetic survey using grounded source; Chihyo source gata kuchu denji tansa no kisoteki kenkyu. 2}
author = {Mogi, T, Fujimitsu, Y, Tanaka, Y, Jomori, N, Morikawa, T, and Kusunoki, K}
abstractNote = {With an objective to develop an airborne electromagnetic survey method for greater depths achievable of exploration, a discussion was given on an exploration method of a type in which a transmitting device is placed on the ground to receive signals in an atmosphere. A prototype exploration apparatus is mounted with a fluxgate magnetometer, an attitude meter, a GPS, and a battery. This exploration apparatus is suspended on a 30 meter long rope from a helicopter to perform the exploration. Two flight tests on this apparatus were carried out in the Unzen area, Nagasaki Prefecture and the Motomiya area, Wakayama Prefecture. The ground source was extended to a distance of 1.5 km, and a current of about 20 A was flown with a quiescent wave having four-second cycles. The helicopter flew nearly horizontally at a ground speed of about 50 km, a flight altitude of 450 m above sea level, and a terrain clearances of 100 to 400 m. The obtained data had variations in correspondence with changes in roll and pitch angles, whereas the variation of about 5000 nT was reduced to about 1000 nT as a result of correction. It was not possible, however, to correct completely the variation with short cycles, requiring further discussions on frequency characteristics of the magnetometer. 6 figs., 1 tab.}
place = {Japan}
year = {1997}
month = {May}
}