CN102221680B - Resultant field magnetometer is measured flat survey method and the device thereof of rock, specimen of ore magnetic parameter - Google Patents
Resultant field magnetometer is measured flat survey method and the device thereof of rock, specimen of ore magnetic parameter Download PDFInfo
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Abstract
The present invention relates to a kind of resultant field magnetometer and measure flat survey method and the device thereof of rock, specimen of ore magnetic parameter, its flat this device of mark adopting comprises resultant field magnetometer, is built-in with Riker mount, flat board and the pallet of sample, resultant field magnetometer comprises probe and probe bracket, resultant field magnetometer is recorded to parameter substitution following formula, obtain sample magnetic parameter one magnetic susceptibility K and remanent magnetization Mr:<maths num=" 0001 "></maths><maths num="0002"></maths>In China's " ground high-precision magnetic survey technical regulation " appendix C, having provided resultant field magnetometer, to measure the device of rock, specimen of ore magnetic parameter be tiltedly to survey device. The present invention will tiltedly survey and change flat survey into, put down survey device and not only can remove oblique survey from because of the inaccurate error producing of oblique adjusting, and rock, specimen of ore constantly overturn to shake and can produce tilt displacement on inclined-plane, bring the worst error of range deviation. Flat survey method of the present invention and device are simply firm, can improve the precision of rock, specimen of ore magnetic parameters.
Description
Technical field
The invention belongs to geophysics magnetic method and reconnoitre rock, specimen of ore magnetic parameter field, particularly a kind of flat survey method and device thereof that utilizes resultant field magnetometer to measure rock, specimen of ore magnetic parameter.
Background technology
After magnetic survey instrument in the ground of China is claimed by the alternative traditional mechanical magnetic of free proton magnetometer, the precision that ground magnetic method is reconnoitred is greatly enhanced. Because what proton magnetometer was measured is the value of geomagnetic total field (T), also make corresponding change so measure device and the computing formula of rock (ore) sample magnetic parameter with it, in the appendix C of " ground high-precision magnetic survey technical specification " by name, provided the computing formula of measuring magnetic parameter:
Gauss's second place:
Magnetic susceptibility:
Remanence rate:
Magnetic declination:
Magnetic dip angle:
The positive and negative direction of each axle reads four numbers (Riker mount is read a number along the every half-twist of T direction), averages, for example:
In various above, r is sample center and the distance between probe below; T0For normal geomagnetic total field; V is the volume of Riker mount; n0For the reading value in earth's magnetic field, n1～n6For the magnetic field reading value of six faces of Riker mount.
Be used for measuring the oblique survey device of magnetic parameter as shown in Figure 1, comprise resultant field magnetometer probe 11, be used for supporting the swash plate 14 of probe pole 12, Riker mount 13, the adjustable inclination angle of probe, the movable latch 15 of selecting r (distance between sample center and center probe) and fixed preparation box, fixing and adjustable inclination screw rod 16, can do the flat board 17 and the tripod 18 that horizontally rotate.
The central axis of the tested sample of this oblique survey matching requirements, with local geomagnetic inclination (I0) gradient, aim at the center of resultant field magnetometer probe. Accordingly, this device will have the mechanism of adjusting sample plate inclination and reach the goniometer when geomagnetic inclination, in order to prevent the downslide of sample on inclined-plane, also will have the anti-skidding baffle plate of energy adjustable range, and these devices will strictly adopt non-magnetic material, prevent magnetic interference. Because structure is comparatively complicated, on inclined-plane, stir sample test in addition, be easy to make device to produce mobile. And magnetic field intensity has three cubed inverse relation with distance, even if also making to measure, small displacement owes accurate.
Summary of the invention
The defect existing in order to overcome existing measuring method and device, the object of the invention is to propose a kind of magnetic parameter that can improve and measures the rock of precision, flat survey method and the device thereof of specimen of ore magnetic parameter.
A kind of resultant field magnetometer is measured rock, the flat survey device of specimen of ore magnetic parameter, this device comprises resultant field magnetometer, Riker mount, flat board and pallet, rock sample or specimen of ore are housed in described Riker mount, described resultant field magnetometer comprises probe, lower probe and probe bracket, it is characterized in that: described flat board supports and be placed in stably normally magnetic field by pallet, and the vertical line perpendicular with dull and stereotyped major axis that makes to be positioned on flat board aimed at magnetic north, described resultant field magnetometer is positioned over a side of dull and stereotyped major axis, described flat board is provided with chute, the Riker mount that is built-in with sample is placed on to the enterprising line slip of dull and stereotyped chute, keep lower center probe and the Riker mount center of described resultant field magnetometer contour.
A kind of resultant field magnetometer is measured the flat survey method of rock, specimen of ore magnetic parameter, it is characterized in that: the method adopt device comprise there is the resultant field magnetometer of upper and lower probe, the flat board that is built-in with the Riker mount of sample and supports by pallet, comprise the steps:
A) select geomagnetic normal field stably, pallet is settled firmly, adopt compass by dull and stereotyped leveling, and the vertical line perpendicular with dull and stereotyped major axis that makes to be positioned on flat board aimed at magnetic north, resultant field magnetometer is placed in to a dull and stereotyped side, make to leave spacing between resultant field magnetometer and flat board, make the lower center probe of resultant field magnetometer and Riker mount center contour, measure to form Gauss's second place;
B) read normal geomagnetic total field T by resultant field magnetometer0, the Riker mount that is built-in with sample is placed in dull and stereotyped chute, slip Riker mount, makes the reading of resultant field magnetometer obviously depart from normally magnetic field value T0, the distance R between the lower center probe of measurement Riker mount center and resultant field magnetometer;
C) keep one of Riker mount to face up, horizontally rotate Riker mount, make successively four side Chao Nan of Riker mount, and record respectively 4 magnetic field values of position, sample four directions of living in by resultant field magnetometer; Turned upside down Riker mount, make its another side upward, again record respectively 4 magnetic field values of sample four directions position of living in by resultant field magnetometer, until six difference that resultant field magnetometer records respectively Riker mount and 24 magnetic field values of four sides during successively towards south, are passed through T upwardijRecord respectively this 24 magnetic field values;
D) the volume V of measurement Riker mount;
E) by the T recording in steps A0, the R recording in step B, 24 magnetic field values that record in the V recording in step D and step C respectively substitution following formula draw magnetic susceptibility K and the remanent magnetization Mr of sample:
Draw magnetic susceptibility K by following formula (7):
K in formulaz、Ky、KxBe respectively the axial magnetic susceptibility of sample three;
TijFor sample is under different conditions, the actual measurement magnetic field value recording respectively by resultant field magnetometer, the end face that tens i is Riker mount; Units j is the southern side face of Riker mount;
R is the vertical range between Riker mount and lower center probe; V is the volume of Riker mount; T0For normal geomagnetic total field;
Draw remanent magnetization Mr by following formula (8):
Wherein:
M in formularz、Mry、MrxBe respectively the axial remanent magnetization of sample three;
I is magnetic dip angle normally;
T13、T14、T15、T16The end face that is respectively Riker mount is 1, its south is respectively 3,4,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T23、T24、T25、T26The end face that is respectively Riker mount is 2, its south is respectively 3,4,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T31、T32、T35、T36The end face that is respectively Riker mount is 3, its south is respectively 1,2,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T41、T42、T45、T46The end face that is respectively Riker mount is 4, its south is respectively 1,2,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T51、T52、T53、T54The end face that is respectively Riker mount is 5, its south is respectively 1,2,3,4 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T61、T62、T63、T64The end face that is respectively Riker mount is 6, its south is respectively 1,2,3,4 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
F) by gained M in step erx、Mry、MrzIn substitution following formula, obtain magnetic declination ф and the inclination obliquity I of the remanent magnetization vector of oriented specimen0：
Beneficial effect of the present invention is:
Flat survey method of the present invention and device have not only saved the labyrinth of tiltedly surveying device in prior art, oblique adjusting process and the inaccurate error of bringing of oblique adjusting in different latitude area are also removed from, due to Riker mount upset vibrations of tens times on inclined plane, be easy to make the distance between sample center and lower center probe to change to some extent, cause large error to occur; The overall structure of flat survey device is simple, firm, is easy to the Riker mount that overturns, and can not produce change of distance, can improve the precision of magnetic parameters.
Brief description of the drawings
Fig. 1 is the oblique structural representation of this device of mark in prior art, wherein 11-probe, the 12-pole of popping one's head in, 13-Riker mount, 14-swash plate, 15-movable latch, 16-screw rod, 17-flat board, 18-tripod;
Fig. 2 is the structural representation of flat this device of mark of adopting in flat survey method of the present invention, wherein 21-resultant field magnetometer, and 22-Riker mount, 23-flat board, 24-pallet, pops one's head under 25-, 26-probe bracket, the upper probe of 27-;
Fig. 3 is the signature of Riker mount face.
Detailed description of the invention
Below in conjunction with accompanying drawing, flat survey method and the device thereof of rock of the present invention, specimen of ore magnetic parameter are further described in detail.
Flat survey method of the present invention is by normal geomagnetic total field (T0) be decomposed into vertical component magnetic field (Z by magnetic dip angle (I)0) and horizontal component magnetic field (H0),
Z0＝T0sinI(1)
H0＝T0cosI(2)
Vertical component magnetic field Z0With horizontal component magnetic field H0Act on sample simultaneously.
Sense magnetic and original remanent magnetism that sample produces, the resultant field magnetometer (the resultant field magnetometer in the present invention can adopt proton magnetometer, optical pumped magnetometer or superconductive magnetometer etc.) that is positioned at Gauss's second place measures, and is called the abnormal Δ T in total magnetic field, has
ΔT＝ΔZsinI+ΔHcosI(3)
In formula, Δ Z and Δ H are respectively Z0And H0Vertical magnetic field and horizontal magnetic field that the lower sample of effect produces are abnormal.
Sample dress is stood in a cubical Riker mount, and box has three axles, makes x axle forward refer to east by left hand rule, and y axle forward refers to north, and z axle forward is downward, if determined direction when collection of specimens, oriented specimen direction should be consistent with y axle forward. 3 axial forward box faces are marked with respectively 2,4,6, and negative sense box face is marked with respectively 1,3,5. Riker mount is flat on specimen holder, x axle forward refers to east (being to point to identical box face with x axle on Riker mount to be labeled as 2), y axle forward refers to north (being to point to identical box face with y axle on Riker mount to be labeled as 4), under z axle forward refers to (being to point to identical box face with z axle on Riker mount to be labeled as 6), now, at vertical component magnetic field Z0With horizontal component magnetic field H0Effect under, sample produce vertical magnetic field Δ Z and horizontal magnetic field Δ H be respectively:
Sample is horizontally rotated to 90 ° counterclockwise, the vertical magnetic field Δ Z cotype (4) that sample produces, the horizontal magnetic field Δ H of generationxFor:
Above in three formulas, mz、my、mx；Kz、Ky、KxAnd Mrz、Mry、MrxBe respectively the axial magnetic moment of sample three, magnetic susceptibility and remanent magnetization, KzZ0For the axial induced magnetization of z, the volume that V is sample, R is the distance between sample and resultant field magnetometer probe center.
By the upper and lower inversion of sample with horizontally rotate 180 °, can obtain the situation that induced magnetization is identical or contrary with remanent magnetization direction, the plus sige in (4), (5), (6) formula changes minus sign into, then (4)～(6) formula that (4) above～(6) formula and plus sige is changed into minus sign is added the magnetic susceptibility K that tries to achieve sample, and (4)～(6) formula that changes (4) above～(6) formula and plus sige into minus sign is subtracted each other and tried to achieve remanent magnetization Mr. Thus, magnetic parameter of the present invention is to try to achieve by the plus and minus calculation between above formula.
As shown in Figure 2, flat survey device of the present invention comprises resultant field magnetometer 21, Riker mount 22, flat board 23 and pallet 24, rock sample or specimen of ore are housed in Riker mount 22, resultant field magnetometer 21 comprises probe 27, lower probe 25 and probe bracket 26, between upper and lower probe and between lower probe and ground, is connected support respectively by probe bracket 26. Dull and stereotyped 23 support and are placed in stably normally magnetic field by pallet 24, and the vertical line perpendicular with dull and stereotyped major axis that makes to be positioned on flat board aimed at magnetic north, resultant field magnetometer 21 is positioned over west side or the east side of dull and stereotyped 23 major axis center lines, and and between flat board, leave the spacing of 1-2mm, dull and stereotyped 23 are provided with chute, the cube Riker mount 22 that is built-in with sample is placed on to dull and stereotyped 23 the enterprising line slip of chute, keeps lower probe 25 centers and Riker mount 22 centers of resultant field magnetometer contour.
Flat survey device of the present invention has solved geomagnetic total intensity T0Under magnetization, after the method by Gauss's second place calculating sample magnetic parameter, form, below the flat survey method of concrete sample magnetic parameter is described, the method is applicable to the whole world, is not subject to region or environmental limit. Its concrete steps are as follows:
A) select geomagnetic normal field stably, pallet is settled firmly, adopt compass by dull and stereotyped leveling, and the vertical line perpendicular with dull and stereotyped major axis that makes to be positioned on flat board aimed at magnetic north, resultant field magnetometer is placed in to west side or the east side of dull and stereotyped long axis of spindle, resultant field magnetometer and dull and stereotyped spacing are 1-2mm, make the lower center probe of resultant field magnetometer and Riker mount center contour, measure to form Gauss's second place.
B) read normal geomagnetic total field T by resultant field magnetometer0, the cube Riker mount that is built-in with sample is placed in dull and stereotyped chute, slip Riker mount, makes the reading of resultant field magnetometer obviously depart from normally magnetic field value T0, the distance R between the lower center probe of measurement Riker mount center and resultant field magnetometer.
C) keep one of Riker mount to face up, horizontally rotate Riker mount, make successively four side Chao Nan of Riker mount, and record respectively 4 magnetic field values of position, sample four directions of living in by resultant field magnetometer; Turned upside down Riker mount, make its another side upward, again record respectively 4 magnetic field values of sample four directions position of living in by resultant field magnetometer, until six difference that resultant field magnetometer records respectively Riker mount and 24 magnetic field values of four sides during successively towards south, are passed through T upwardijRecord respectively this 24 magnetic field values, tens i is Riker mount court reference numerals above, and units j is the reference numerals of Riker mount southern side face, and six faces are respectively by digital 1-6 mark; For example: actual measurement sample magnetic field T64, the upper end face that makes Riker mount is 6, southern side face is 4, as shown in Figure 3, if want to continue actual measurement sample magnetic field T61, goes up that end face is constant, horizontally rotating Riker mount, to make its southern side face be 1, can record.
D) try to achieve the volume V of Riker mount by measuring the length of Riker mount.
E) by the T recording in steps A0, the R recording in step B, 24 magnetic field values that record in the V recording in step D and step C respectively substitution following formula draw magnetic susceptibility K and the remanent magnetization Mr of specimen of ore:
Draw magnetic susceptibility K by following formula (7):
K in formulaz、Ky、KxBe respectively the axial magnetic susceptibility of sample three;
TijFor sample is under different conditions, the actual measurement magnetic field value recording respectively by resultant field magnetometer;
I is the end face of Riker mount, and its span is 1-6; J is the southern side face of Riker mount, and its span is 1-6, and its span is four numerical value in units i;
R is the vertical range between Riker mount and lower center probe; V is the volume of Riker mount; T0For normal geomagnetic total field;
Draw remanent magnetization Mr by following formula (8):
Wherein:
M in formularz、Mry、MrxBe respectively the axial remanent magnetization of sample three;
I is magnetic dip angle normally;
T13、T14、T15、T16The end face that is respectively Riker mount is 1, its south is respectively 3,4,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T23、T24、T25、T26The end face that is respectively Riker mount is 2, its south is respectively 3,4,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T31、T32、T35、T36The end face that is respectively Riker mount is 3, its south is respectively 1,2,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T41、T42、T45、T46The end face that is respectively Riker mount is 4, its south is respectively 1,2,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T51、T52、T53、T54The end face that is respectively Riker mount is 5, its south is respectively 1,2,3,4 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T61、T62、T63、T64The end face that is respectively Riker mount is 6, its south is respectively 1,2,3,4 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured.
F) by gained M in step erx、Mry、MrzIn substitution following formula, obtain magnetic declination ф and the inclination obliquity I of the remanent magnetization vector of oriented specimen0：
On resultant field magnetometer 21, be connected with a computer, the each formula in step e and step F carries out computing by computer, thereby obtains magnetic susceptibility K, the remanent magnetization Mr of sample and magnetic declination ф and the inclination obliquity I of remanent magnetization vector0. The T recording in steps A0Pass to computer with 24 magnetic field values that record in step C by resultant field magnetometer, the V people who records in the R recording in step B and step D is for being input in computer.
When resultant field magnetometer in the present invention is applied in flat survey method and flat survey device, conventionally adopt proton magnetometer, also can select as required other resultant field magnetometer such as optical pumped magnetometer or superconductive magnetometer.
Points for attention in flat mark basis:
(1) General Requirements of test specimen, should process by " ground high-precision magnetic survey technical tutorial " annex requirement.
(2) flat this device of mark of the present invention, is the determinator of the north orientation Gauss second place. As shown in Figure 2, between resultant field magnetometer and sample flat board, should have very little distance, the vibrations of avoiding sample to stir resultant field magnetometer is brought are disturbed.
(3) adopt Riker mount face mark as shown in Figure 3.
(4) high-intensity magnetic field (n × 10 while surveying magnetic for fear of resultant field magnetometer4A/m) polarization is to the magnetized lingering effect of sample, and should lengthen the resultant field magnetometer sampling time carries out the collection of magnetic field data.
(5) method of avoiding negative magnetic susceptibility to occur:
1) select homogeneous rock or ore to make sample, sample shape need rule, avoids the inhomogeneous and out-of-shape of magnetic as far as possible and causes that sample turns upside down, remanent magnetism can not be offset, produce the drawback that magnetic susceptibility negative value occurs;
2) keep the distance between sample and probe enough far away, making sample is dipole magnetic field.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any amendment of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. a resultant field magnetometer is measured the flat survey method of rock, specimen of ore magnetic parameter, it is characterized in that: the device that the method adopts comprises and comprises the steps: the have upper and lower probe resultant field magnetometer (21) of (27,25), the flat board (23) that is built-in with the Riker mount (22) of sample and supports by pallet (24)
A) select geomagnetic normal field stably, pallet (24) is settled firmly, adopt compass by flat board (23) leveling, and the vertical line perpendicular with dull and stereotyped major axis that makes to be positioned on flat board aimed at magnetic north, resultant field magnetometer (21) is placed in to a side of flat board (23), make to leave spacing between resultant field magnetometer and flat board, make lower probe (25) center and Riker mount (22) center of resultant field magnetometer contour, measure to form Gauss's second place;
B) read normal geomagnetic total field T by resultant field magnetometer0, the Riker mount that is built-in with sample is placed in dull and stereotyped chute, slip Riker mount, makes the reading of resultant field magnetometer obviously depart from normally magnetic field value T0, measure distance R in the heart in the lower probe (25) of Riker mount (22) center and resultant field magnetometer;
C) keep one of Riker mount to face up, horizontally rotate Riker mount (22), make successively four side Chao Nan of Riker mount, and record respectively 4 magnetic field values of position, sample four directions of living in by resultant field magnetometer; Turned upside down Riker mount, make its another side upward, again record respectively 4 magnetic field values of sample four directions position of living in by resultant field magnetometer, until six difference that resultant field magnetometer records respectively Riker mount and 24 magnetic field values of four sides during successively towards south, are passed through T upwardijRecord respectively this 24 magnetic field values;
D) the volume V of measurement Riker mount (22);
E) by the T recording in steps A0, the R recording in step B, 24 magnetic field values that record in the V recording in step D and step C respectively substitution following formula draw magnetic susceptibility K and the remanent magnetization Mr of sample:
Draw magnetic susceptibility K by following formula (7):
K in formulaz、Ky、KxBe respectively the axial magnetic susceptibility of sample three;
TijFor sample is under different conditions, the actual measurement magnetic field value recording respectively by resultant field magnetometer, the end face that tens i is Riker mount; Units j is the southern side face of Riker mount;
R is the vertical range between Riker mount and lower center probe; V is the volume of Riker mount; T0For normal geomagnetic total field;
Draw remanent magnetization Mr by following formula (8):
Wherein:
M in formularz、Mry、MrxBe respectively the axial remanent magnetization of sample three;
I is magnetic dip angle normally;
T13、T14、T15、T16The end face that is respectively Riker mount is 1, its south is respectively 3,4,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T23、T24、T25、T26The end face that is respectively Riker mount is 2, its south is respectively 3,4,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T31、T32、T35、T36The end face that is respectively Riker mount is 3, its south is respectively 1,2,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T41、T42、T45、T46The end face that is respectively Riker mount is 4, its south is respectively 1,2,5,6 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T51、T52、T53、T54The end face that is respectively Riker mount is 5, its south is respectively 1,2,3,4 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
T61、T62、T63、T64The end face that is respectively Riker mount is 6, its south is respectively 1,2,3,4 o'clock, four actual measurement magnetic field values that resultant field magnetometer is measured;
F) by gained M in step erx、Mry、MrzIn substitution following formula, obtain magnetic declination ф and the inclination obliquity I of the remanent magnetization vector of oriented specimen0：
2. resultant field magnetometer as claimed in claim 1 is measured the flat survey method of rock, specimen of ore magnetic parameter, it is characterized in that: described resultant field magnetometer (21) is positioned over west side or the east side of dull and stereotyped major axis center line, and and flat board between leave the spacing of 1-2mm.
3. resultant field magnetometer as claimed in claim 1 or 2 is measured the flat survey method of rock, specimen of ore magnetic parameter, it is characterized in that: described sample is contained in cube Riker mount (22), and six box faces of Riker mount (22) are used respectively digital 1-6 mark.
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| CN102621506B (en) * | 2012-03-26 | 2014-07-09 | 中国冶金地质总局山东正元地质勘查院 | Total field magnetometer 4-direction determining method and device for magnetic parameters of rock and ore samples |
| CN102621595A (en) * | 2012-03-30 | 2012-08-01 | 中天启明石油技术有限公司 | Debugging table for fluxgate of exploring tube |
| CN103116141A (en) * | 2013-01-28 | 2013-05-22 | 山东大学 | Device and method for quickly estimating magnetic field intensity |
| CN103175510B (en) * | 2013-03-13 | 2015-06-03 | 华中科技大学 | Smart laser profiler automatic in leveling and direction adjustment |
| CN204462361U (en) * | 2015-03-02 | 2015-07-08 | 中国冶金地质总局山东正元地质勘查院 | A kind of rock and ore sample magnetic parameters device |
| CN105785292B (en) * | 2016-04-12 | 2018-04-10 | 江勇 | A kind of rock and ore sample magnetic parameters device used for geological prospecting and measuring method |
| CN107479012B (en) * | 2017-08-08 | 2019-12-03 | 黑龙江省地球物理地球化学勘查院 | A kind of magnetic sample measurement device of simplicity |
| CN111694061B (en) * | 2020-05-13 | 2023-06-02 | 东华理工大学 | Multi-dipole source transmitting device applied to electromagnetic exploration |
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