WO2015014161A1 - 高精度地磁矢量野外测量方法及其装置 - Google Patents
高精度地磁矢量野外测量方法及其装置 Download PDFInfo
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- WO2015014161A1 WO2015014161A1 PCT/CN2014/079467 CN2014079467W WO2015014161A1 WO 2015014161 A1 WO2015014161 A1 WO 2015014161A1 CN 2014079467 W CN2014079467 W CN 2014079467W WO 2015014161 A1 WO2015014161 A1 WO 2015014161A1
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- 239000013598 vector Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 title abstract description 32
- 230000005389 magnetism Effects 0.000 title abstract 3
- 230000005284 excitation Effects 0.000 claims description 131
- 230000005358 geomagnetic field Effects 0.000 claims description 63
- 238000000691 measurement method Methods 0.000 claims description 30
- 239000000523 sample Substances 0.000 claims description 29
- 238000004364 calculation method Methods 0.000 claims description 23
- 239000011521 glass Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 7
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/40—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for measuring magnetic field characteristics of the earth
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2200/00—Details of seismic or acoustic prospecting or detecting in general
Definitions
- the invention relates to the technical field of geophysical geomagnetic field fine measurement, and relates to a high precision geomagnetic field field measuring method and a device thereof.
- Geomagnetic vector measurement can effectively reduce the multi-solution in geophysical exploration inversion and contribute to the qualitative and quantitative interpretation of magnetic materials.
- the geomagnetic field measuring instruments commonly used by geophysical prospecting workers at home and abroad are ordinary proton magnetometers, optical pump magnetometers or overhauser proton magnetometers. These magnetometers are easy to use in the field, and the measurement accuracy has reached or exceeded 1 ⁇ . It can measure the geomagnetic total field strength scalar value.
- the total field magnetometer cannot measure the geomagnetic field vector. When performing geomagnetic vector field measurement, it can only be used. A three-component magnetic fluxmeter with low accuracy and measurement error of ⁇ , this magnetometer cannot meet the needs of professional geophysical exploration work.
- the Canadian CEM company's didD vector magnetometer currently marketed represents the international advanced level of geomagnetic vector measurement.
- the measurement method used is: Install two sets of mutually orthogonal coils on the high-precision total field magnetometer probe, the axis of the orthogonal coil It is orthogonal to the geomagnetic field vector F in the horizontal plane and the meridional plane. First, record the total magnetic field T when no bias current is applied, and then input the equal-sized, opposite-direction bias currents to the coils that are perpendicular to the inner axis of the meridional plane, that is, the magnetic field inclination (D) coil, and record the two.
- D magnetic field inclination
- the combined magnetic field of the deflection magnetic field generated by the bias current and the geomagnetic field is called ⁇ and Im.
- the coils in the horizontal axis T of the horizontal plane that is, the magnetic declination (D) coil, are sequentially input in equal sizes.
- GME's didD vector magnetometer does not require full compensation for geomagnetic components, and the device is relatively lightweight.
- the installation and adjustment preparation of the instrument is complicated and cumbersome, and can only be used for the inclination of the earth magnetic field I.
- a stationary seismic geomagnetic observation station with a known magnetic field declination D measures the amount of change in the geomagnetic inclination angle I and the yaw angle D with time. Therefore, existing geomagnetic vector measuring equipment and technology They are not suitable for high-precision measurement in the field prospecting environment.
- the present invention is achieved by the following technical solutions: High-precision geomagnetic vector field measurement method, using a tripod, a vertical coil and a total field magnetometer to measure a normal geomagnetic field T without an additional magnetic field.
- the geomagnetic field is added with the vertical upward magnetic field T f and the two synthetic magnetic field values of the double vertical upward magnetic field 2T f to calculate the vertical component ⁇ of the magnetic field and the horizontal component 1 ⁇ the geomagnetic tilt angle I.
- the calculation method is as follows:
- the horizontal coil is the Helmholtz coil, and the total field magnetometer is used.
- the geomagnetic field is measured by adding a horizontal forward magnetic field ⁇ + / / and a horizontal reverse magnetic field " ⁇ / after the synthetic magnetic field, calculate the geomagnetic declination, the calculation method is as follows:
- Mantle and poultry B ⁇ 3 ⁇ 4-S1; where: DO is the angle between the horizontal coil axis and the geographic north direction, which is a known preset value.
- Adjust the excitation power switch so that the excitation power supply does not apply power to the vertical coil. Use the total field magnetometer to measure the geomagnetic field T without additional magnetic field. ; 4 Adjust the excitation power switch to make the excitation power supply reversely power the vertical coil, the current intensity is I, the vertical coil generates a vertical upward magnetic field T f , and the total field magnetometer measures the magnetic field T f and the synthetic magnetic field T. ;
- the measured values are calculated for the vertical component of the magnetic field ⁇ , the horizontal component 1 ⁇ the geomagnetic tilt angle I and the geomagnetic declination D, as follows:
- DO is the angle between the horizontal coil axis and the geographic north direction, which is a known preset value
- High-precision geomagnetic vector field measurement method including tripod, horizontal dial mounted on the tripod, drum mounted on the dial, fixed post in the drum, coil holder on the fixed post, two on the coil base
- the half shaft bracket, the top half shaft of the two half shaft brackets is installed, the half shaft is connected with the vertical coil bobbin through the connecting plate, the vertical coil bobbin is connected with the horizontal coil bobbin, the horizontal coil is wound along the horizontal coil bobbin, and the vertical coil bobbin is wound vertically.
- the coil, the vertical coil and the geometric center of the horizontal coil coincide, the vertical coil and the horizontal coil are connected to the coil excitation power source through the wire, and the total field magnetometer probe is installed at the geometric center of the vertical coil and the horizontal coil, the total field magnetometer probe Connect to the total field magnetometer via a wire.
- a support plate is mounted on the horizontal coil bobbin, and two glass long-level bubbles orthogonal to each other are installed on the support plate, and the horizontal planes of the two glass long-level bubbles are parallel to the plane of the vertical coil.
- the upper end of the horizontal dial and the outer circumference of the drum are mounted with a rotating base, and the upper end surface of the rotating base is connected with the coil base, and the locking bolt is mounted on the side of the rotating base.
- the vertical coil bobbin and the horizontal coil bobbin are orthogonally mounted on the two half shafts of the coil base, and the coil bobbin can be rotated 180° vertically around the horizontal half shaft, and the coil base can be rotated 180° horizontally around the fixed post.
- the half shaft is connected to the vertical coil bobbin through the connecting plate, the vertical coil bobbin is connected with the horizontal coil bobbin, the horizontal coil is wound along the horizontal coil bobbin, the vertical coil is wound along the vertical coil bobbin, the vertical coil and the horizontal coil
- the geometric center of the coil coincides, the vertical coil and the horizontal coil are connected to the coil excitation power source through the wire, and the total field magnetometer probe is installed at the coincidence of the geometric center of the coil, and the total field magnetometer probe is connected to the total field magnetometer through the wire;
- the power supply intensity is I
- the vertical coil generates a vertical upward magnetic field T f
- the total field magnetometer is used to measure the combined magnetic field T f of the magnetic field T f and the geomagnetic field.
- DO is the angle between the horizontal coil axis and the geographic north direction, which is a known preset value.
- the measuring method of the present invention is suitable for geomagnetic measurement in mid-high latitude regions, and the measuring method of the present invention only needs to adjust the additional magnetic field coil to a horizontal or vertical state, and the preparation work before observation is simple, and can be used not only for geophysics
- the geomagnetic vector of the survey is quickly measured in a large area in the field, and it can also be used for fixed station fixed-point observation.
- Efficiency The measuring device of the present invention only needs to provide an additional magnetic field whose value is different by one time in a short time and whose direction is opposite to the vertical component of the earth magnetic field, and the required additional magnetic field value does not exceed 2000 nT, and the vertical component of the geomagnetism is not required to be accurately compensated.
- the coil current that provides the additional magnetic field does not have to be stabilized for a long time with high power.
- the power consumption of the coil is low, and the device is light, which is not only suitable for field mobile measurement, but also can significantly reduce energy consumption for fixed station observation.
- the invention uses vertical and horizontal two sets of magnetic field coils combined with a total field magnetometer to quickly measure various components of the geomagnetic field vector in the field environment, including vertical component ⁇ , horizontal component 11, inclination I and declination D, and further can be calculated
- the geomagnetic field component in any direction has many geomagnetic vector parameters. Before the observation, only the coil needs to be adjusted horizontally and directionally. The preparation before the measurement is relatively simple, and it is suitable for the fine measurement in the geophysical survey profile work.
- the present invention uses a set of vertical magnetic field coils in conjunction with a total field magnetometer to measure other earth's magnetic field components other than the geomagnetic declination D, including the vertical component Z, the horizontal component H, and the tilt angle I. It is only necessary to adjust the coil horizontally before the observation, which is suitable for large-area rapid measurement in the field survey of geophysical exploration.
- the geomagnetic field vector measurement accuracy of the present invention is positively correlated with the accuracy of the total field magnetometer used. If the total field magnetometer uses an overhauser proton magnetometer or an optical pump magnetometer with a measurement accuracy of O.OlnT or higher, the geomagnetic field vector measurement accuracy of the present invention is much better than the three-component fluxgate of the measurement error number ⁇ . Magnetometer.
- FIG. 1 is a schematic diagram of the geomagnetic vector field measurement of the present invention
- the drawing is a vertical plane passing the geomagnetic field vector ⁇ and the vertical coil axis
- ⁇ is a horizontal component
- ⁇ is a vertical component
- T f and 2T f are twice the value difference
- the vertical additional magnetic field whose direction is opposite to the vertical component of the earth's magnetic field
- Z - T f is the vertical component of the combined magnetic field after the application of the reverse additional magnetic field
- Z - 2T f is the vertical component of the combined magnetic field after applying the reversed additional magnetic field twice, T .
- FIG. 2 value is the combined magnetic field observed after adding the reverse vertical magnetic field and the 2 times reverse vertical magnetic field, I is the geomagnetic inclination;
- FIG. 2 is the geomagnetic vector field of the present invention.
- Figure 3 is a schematic view showing the structure of the measuring device used in the measuring method;
- Figure 3 is a schematic view showing the enlarged structure of the portion I in Figure 2;
- the normal geomagnetic field T when no additional magnetic field is measured is measured by a tripod, a vertical coil and a total field magnetometer.
- the earth's magnetic field is added with a vertical upward magnetic field T f and two synthetic magnetic field values T T. 2 that add twice the vertical upward magnetic field 2T f to calculate the vertical component ⁇ and the horizontal component of the magnetic field! ⁇
- Geomagnetic inclination I calculated as follows:
- the high-precision geomagnetic vector field measurement method sets a horizontal coil so that the vertical coil and the geometric center of the horizontal coil coincide, and the total field magnetometer is used to measure the geomagnetic field with two horizontal forward magnetic fields and a horizontal reverse magnetic field.
- the synthetic magnetic field value ⁇ + / / calculate the geomagnetic declination, the calculation method is as follows:
- the angle between the axis of the DC horizontal coil and the geographic north direction is a known preset value.
- Adjust the excitation power switch so that the excitation power supply does not apply power to the vertical coil. Use the total field magnetometer to measure the geomagnetic field T without additional magnetic field. ; 4 Adjust the excitation power switch to make the excitation power supply reversely power the vertical coil, the current intensity is I, the vertical coil generates a vertical upward magnetic field T f , and the total field magnetometer measures the magnetic field T f and the synthetic magnetic field T. ;
- the current intensity is 21, the vertical coil generates a vertical upward magnetic field 2T f , and the total field magnetometer is used to measure the magnetic field of the magnetic field 2T f and the geomagnetic field. 2 , use ⁇ . ⁇
- the horizontal coil is mounted on the vertical coil, the geometric center of the vertical coil and the horizontal coil are coincident, and the total field magnetometer probe is placed at the geometric center of the two coils, and the horizontal coil is the Helmholtz coil.
- the field magnetometer measures the geomagnetic field plus the horizontal magnetic field ⁇ + / / and the horizontal magnetic field of the synthetic magnetic field, calculate the geomagnetic declination, the calculation method is as follows:
- the device for using the high-precision geomagnetic vector field measurement method includes a tripod 1, a tripod 1
- the horizontal dial 3 is mounted thereon, the drum 6 is mounted on the horizontal dial 3, the fixed column 9 is mounted in the drum 6, the coil base 8 is mounted on the fixed column 9, and two half shaft brackets are mounted on the coil base 8, two half shafts A corresponding half shaft is mounted on the top of the bracket, the half shaft is connected to the vertical coil bobbin 12 through the connecting plate, the vertical bobbin 12 is connected to the horizontal bobbin 11, the horizontal coil 21 is wound along the horizontal bobbin 11, and the vertical coil 20 is wound along the vertical bobbin 12.
- the vertical coil 20 and the geometric center of the horizontal coil 21 coincide, and the vertical coil 20 and the horizontal coil 21 are connected to the coil excitation power source through a wire, and the total field magnetometer probe 14 is installed at a position where the vertical coil and the geometric center of the horizontal coil coincide.
- the field magnetometer probe 14 is coupled to the total field magnetometer 22 by wires.
- a glass circular bubble 18 is mounted on the outer ring of the horizontal dial 3.
- a preferred solution of the device of the present invention is: a support plate 16 is mounted on the horizontal bobbin 11, and two horizontal glass bubbles 23, 24 orthogonal to each other are mounted on the support plate 16, and the horizontal and vertical coils of the two glass long horizontal bubbles The plane is parallel.
- the upper end of the horizontal dial 3 and the outer periphery of the rotary drum 6 are mounted with a rotary base 5, and the upper end surface of the rotary base 5 is connected to the coil base 8, and the lock bolt 10 is attached to the side surface of the rotary base 5.
- the vertical bobbin 12 is mounted orthogonally to the horizontal bobbin 11 on the two half shafts of the bobbin holder 8. The bobbin can be rotated 180° vertically around the horizontal half shaft, and the coil bobbin 8 can be rotated 180° horizontally around the fixed post 9.
- the preferred overall solution in the high-precision geomagnetic vector field measurement method of the present invention is a measurement method using a combination of a vertical coil and a horizontal coil, and the steps are as follows:
- the vertical coil 20 is wound along the vertical coil bobbin 12, the vertical coil 20 coincides with the geometric center of the horizontal coil 21, and the vertical coil 20 and the horizontal coil 21 are connected to the coil excitation power source through the wires, and the total field magnetic force is installed at the coincidence of the coil geometric center.
- Instrument probe 14 the total field magnetometer probe 14 is connected to the total field magnetometer 22 by wires;
- the power supply intensity is I
- the vertical coil generates a vertical upward magnetic field T f
- the total field magnetometer is used to measure the combined magnetic field T f of the magnetic field T f and the geomagnetic field.
- DO is the angle between the horizontal coil axis and the geographic north direction, which is a known preset value.
- the vertical component of the geomagnetic field can be measured by using the vertical coil alone.
- the horizontal component H and the geomagnetism inclination angle I after combining the vertical coil and the horizontal coil, can measure the vertical component Z of the geomagnetic field, the horizontal component 1 ⁇ the geomagnetic inclination angle I and the geomagnetism declination angle D.
- the geomagnetic vector is measured by the device used in the high-precision geomagnetic vector field measurement method of the present invention, and the tripod in the device used in the high-precision geomagnetic vector field measurement method is placed in the pseudo-observation position, so that the circular level bubble plane on the top of the tripod Substantially centered; adjust the tripod leveling knob so that the two vertical and horizontal leveling bubbles on the coil are centered.
- the azimuth of the horizontal coil is ⁇ .
- the total field magnetometer probe 14 is connected to the total field magnetometer 22 by wires;
- the power supply intensity is I
- the vertical coil generates a vertical upward magnetic field T F
- the total field magnetometer is used to measure the magnetic field T F and the synthetic magnetic field T.
- the power supply strength is 21, the vertical coil generates a vertical upward magnetic field 2T F , and the total field magnetometer is used to measure the magnetic field of the magnetic field 2T F and the geomagnetic field T. 2 With ⁇ . ⁇ ⁇ . 2 Calculate the vertical component ⁇ , horizontal component ⁇ and geomagnetic inclination I of the magnetic field. The calculation method is as follows: ⁇
- Helmholtz coils are used for both the vertical coil and the horizontal coil.
- the coil base can be rotated 180 ° horizontally, and then the excitation power switch is repeatedly adjusted, so that the excitation power supply reverses the vertical coil and reverses the current by 2 times, using the total field magnetometer.
- Use the magnetic total field magnetometer to measure the combined magnetic field ⁇ + / / , ⁇ , of the positive and negative magnetic fields of the horizontal coil and the pre-steering The measured values are averaged as the measurement results.
- the geomagnetic vector is measured by the device used in the high-precision geomagnetic vector field measurement method of the present invention, and the tripod in the device used in the high-precision geomagnetic vector field measurement method is placed in the pseudo-observation position, so that the circular level bubble plane on the top of the tripod It is roughly centered; adjust the tripod leveling knob so that the two vertical and horizontal level bubbles on the vertical coil are in the center. At this time, the vertical coil axis is in the vertical state.
- the measurement steps are as follows:
- the coil base can be rotated 180 ° horizontally, and then the excitation power switch is repeatedly adjusted to reversely energize the vertical power coil of the excitation power source, and the vertical magnetic field of the vertical coil is measured by the total field magnetometer.
- Synthetic magnetic field of magnetic field T. 1 Adjust the excitation power switch to make the excitation power supply reversely charge 2 times of the vertical coil, and measure the combined magnetic field of the vertical magnetic field and the geomagnetic field by the total magnetic field magnetometer. 2 , Take the average The value is taken as the measurement result.
- the geomagnetic vector measurement principle of the measuring method of the present invention is shown in Fig. 1, and the vertical component and the horizontal component of the geomagnetic field are calculated!
- the principle of the geomagnetic inclination angle I and the geomagnetic declination D method is: respectively, the direction of the total field magnetometer probe is opposite to the vertical component of the earth magnetic field, and the magnetic field of the intensity T F , 2T f is measured by the total field magnetometer without additional
- the geomagnetic field T in the case of a magnetic field.
- the combined magnetic field of the additional magnetic field T f and the combined magnetic field of the additional magnetic field 2T f T. 2 satisfy the following equation (Fig. 1):
- T. 2 is a synthetic magnetic field measured by a total field magnetometer when the vertical coil is 2 times reversely excited
- ⁇ + / / is the synthetic magnetic field measured by the total field magnetometer when the horizontal coil is positively excited
- the coil excitation power supply of the present invention can provide a steady current of 1-100 mA, and the excitation power source can generate a magnetic field of 100-2000 nT in the coil.
- the total field magnetometer may be a light pump magnetometer, an overhauser proton magnetometer or a conventional proton magnetometer.
- the measured enthalpy. ⁇ ⁇ . 2 , ⁇ +// can also be controlled by single-chip microcomputer and program-controlled circuit, automatically run in sequence and complete the measurement of the geomagnetic field vector.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2015111804/28A RU2593436C1 (ru) | 2013-07-30 | 2014-06-09 | Способ высокоточной геомагнитной векторной съемки и соответствующее устройство |
CA2919726A CA2919726C (en) | 2013-07-30 | 2014-06-09 | A high precision field measurement method for geomagnetic vectors and a device thereof |
US14/906,434 US9910183B2 (en) | 2013-07-30 | 2014-06-09 | High precision field measurement method for geomagnetic vectors and a device thereof |
Applications Claiming Priority (2)
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CN201310324884.1 | 2013-07-30 | ||
CN2013103248841A CN103389517A (zh) | 2013-07-30 | 2013-07-30 | 一种高精度地磁矢量测量方法及其装置 |
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WO2015014161A1 true WO2015014161A1 (zh) | 2015-02-05 |
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PCT/CN2014/079467 WO2015014161A1 (zh) | 2013-07-30 | 2014-06-09 | 高精度地磁矢量野外测量方法及其装置 |
Country Status (6)
Country | Link |
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US (1) | US9910183B2 (zh) |
CN (7) | CN103389517A (zh) |
CA (1) | CA2919726C (zh) |
CZ (1) | CZ308096B6 (zh) |
RU (1) | RU2593436C1 (zh) |
WO (1) | WO2015014161A1 (zh) |
Cited By (1)
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US9910183B2 (en) | 2018-03-06 |
CN104122596B (zh) | 2017-05-24 |
CN104101908A (zh) | 2014-10-15 |
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CN103389517A (zh) | 2013-11-13 |
CN104122596A (zh) | 2014-10-29 |
US20160154135A1 (en) | 2016-06-02 |
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