CN109471184B - Geomagnetic measurement method based on split type suspension spherical coil - Google Patents
Geomagnetic measurement method based on split type suspension spherical coil Download PDFInfo
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- CN109471184B CN109471184B CN201811349626.8A CN201811349626A CN109471184B CN 109471184 B CN109471184 B CN 109471184B CN 201811349626 A CN201811349626 A CN 201811349626A CN 109471184 B CN109471184 B CN 109471184B
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- 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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Abstract
The invention discloses a geomagnetic measurement method based on a split type suspension spherical coil, which comprises the following steps: installing a measuring system; under the condition that the compensation spherical coil is not powered, the tester host machine measures the total geomagnetic field through the compensation spherical coil; under the condition of supplying power to the compensation spherical coil, recording geomagnetic horizontal components when the measured value reaches the lowest value; the bias spherical coil is powered by the tester host, a bias magnetic field is applied to the bias spherical coil in the east-west direction, and a relative magnetic declination can be obtained by calculating a synthetic magnetic field of the bias magnetic field and the total geomagnetic field; and calculating the rest parameters of the geomagnetism by using the total geomagnetic field, the horizontal geomagnetic component and the relative declination. The split type suspension spherical coil adopted by the geomagnetic measurement method is quite simple in structure, the uniformity of a magnetic field generated inside the coil is higher, the attenuation of the magnetic field outside the coil is quicker, the external radiation is small, and the sampling frequency can be effectively improved.
Description
Technical Field
The invention relates to a geomagnetic measurement method, in particular to a geomagnetic measurement method based on a split type suspension spherical coil.
Background
The conventional suspended spherical coil consists of two spherical coils which are orthogonal to each other, and can be combined with a proton magnetometer to observe the relative values of the absolute value F, the horizontal component H and the deflection angle D of the total field of the geomagnetic field. But has the following disadvantages: (1) because the two spherical coils are assembled into a whole and need to be mutually orthogonal, the assembly and disassembly are more complex, the difficulty of installation, debugging, disassembly and maintenance is high, once a fault occurs, the fault generally needs technicians of manufacturers to finish the operation and maintenance in person, and the operation and maintenance cost is increased; (2) the two spherical coils are assembled into a whole, mutual inductance exists between the two spherical coils, and the observation precision is influenced; (3) the uniformity of the magnetic field generated inside the coil is low; (4) the coil generates a magnetic field which has great influence on external radiation; (5) the observation sampling rate is low, the total field F and the horizontal component H can be measured only twice per minute, and the deflection angle D is 1 time; (6) the bias synthetic magnetic field is formed by combining a compensation magnetic field, a bias magnetic field and a total field in the process of measuring the magnetic declination, so that the compensation magnetic field and the bias magnetic field generated by the instrument in the process of measuring the magnetic declination should act on the probe area at the same time, thus the coils generating two groups of magnetic fields must act on the same area together, and the two groups of coils cannot be independently separated.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the existing geomagnetic measurement method for the suspended spherical coil is more complex to assemble and disassemble, is difficult to install, debug, disassemble and overhaul, has mutual inductance in the coil, generates a magnetic field with lower uniformity and has larger influence on external radiation, has low sampling rate, and the measurement of the magnetic declination angle must depend on the combined calculation of a compensation magnetic field, a bias magnetic field and a total field, so that the method is complicated.
The technical scheme is as follows: the invention relates to a geomagnetism measurement method based on a split type suspension spherical coil, which comprises the following steps:
step 1, installing a measuring system, wherein the measuring system comprises a compensation spherical coil, a bias spherical coil, two groups of suspension devices, two measuring probes and a tester host, the compensation spherical coil and the bias spherical coil are respectively and independently installed in a suspension manner through the two groups of suspension devices, the two measuring probes are respectively arranged in the compensation spherical coil and the bias spherical coil, and the tester host is respectively and electrically connected with the two measuring probes, the compensation spherical coil and the bias spherical coil;
step 3, under the condition that the host computer of the tester supplies power to the compensation spherical coil, the compensation spherical coil forms a vertical magnetic field to offset the vertical component Z of the geomagnetism, and the horizontal component H of the geomagnetism is recorded when the measured value reaches the lowest;
step 4, the tester host supplies power to the bias spherical coil, and the bias spherical coil applies a bias magnetic field C in the east-west direction－And C+The combined bias magnetic field of the bias magnetic field and the total geomagnetic field F is R－And R+Then, the following calculation formula is given:
R+ 2＝F2+C2+2FCsinφ (1)
R－ 2＝F2+C2－2FCsinφ (2)
Fsinφ＝Hsinθ (3)
the relative declination is calculated from the formulas (1), (2) and (3):
in the formula (4), the magnitude of the bias magnetic field C is:
and 5, calculating the rest parameters of the geomagnetism by using the total geomagnetic field F, the horizontal geomagnetic component H and the relative declination theta.
Further, in step 1, the distance between the two groups of suspension devices is 10 meters.
Further, in step 2, the frequency of measurement of the total geomagnetic field F is 4 times/minute.
Further, in step 3, the measurement frequency of the geomagnetic horizontal component H is 6 times/minute.
Further, the two measuring probes are respectively positioned at the spherical center positions of the compensation spherical coil and the offset spherical coil.
Further, the remaining parameters of the geomagnetism include a north component X of the geomagnetic field, an east component Y of the geomagnetic field, and a declination angle I.
Compared with the prior art, the invention has the beneficial effects that: (1) compared with the existing spherical coil measuring mode, the split type suspension spherical coil adopted by the invention has the advantages that the structure is very simple, the uniformity of a magnetic field generated inside the coil is higher, the attenuation of an external magnetic field of the coil is faster, and the external radiation is small; (2) compared with the existing spherical coil integrated orthogonal coil, the split type suspension spherical coil adopted by the invention can ensure that no mutual inductance influence exists at a distance of 10m theoretically, thereby being convenient for improving the sampling frequency; (3) compared with the existing spherical coil measuring mode, the invention increases the times of observing the total geomagnetic field F from the original 2 times to 4 times per minute, increases the horizontal component H from 2 times to 6 times, and improves the acquisitionSample rate; (4) compared with the existing spherical coil declination measurement mode, the method only applies the bias magnetic field C in the east-west direction－、C+And the method is synthesized with the geomagnetic total field F, the compensation on the vertical component Z of the geomagnetic field is not carried out, the calculation is simple and quick, and the calculation result is consistent with that of the traditional method.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a system architecture diagram of the present invention;
FIG. 3 is a diagram of a computational model according to the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example 1:
as shown in fig. 1 to 3, the geomagnetic measurement method based on split type suspension spherical coils according to the present invention includes the following steps:
step 1, installing a measuring system, wherein the measuring system comprises a compensation spherical coil 3, a bias spherical coil 4, two groups of suspension devices 2, two measuring probes 5 and a tester host 1, the compensation spherical coil 3 and the bias spherical coil 4 are independently installed in a suspension mode through the two groups of suspension devices 2 respectively, the two measuring probes 5 are arranged in the compensation spherical coil 3 and the bias spherical coil 4 respectively, and the tester host 1 is electrically connected with the two measuring probes 5, the compensation spherical coil 3 and the bias spherical coil 4 respectively;
step 3, under the condition that the tester host 1 supplies power to the compensation spherical coil 3, the compensation spherical coil 3 forms a vertical magnetic field to offset a geomagnetic vertical component Z, and a geomagnetic horizontal component H is recorded when a measured value reaches the lowest value;
step 4, the tester host 1 supplies power to the bias spherical coil 4, and the bias spherical coil 4 applies a bias magnetic field C in the east-west direction－And C+Of bias magnetic field and total geomagnetic field FThe resultant bias magnetic field is R－And R+Then, the following calculation formula is given:
R+ 2＝F2+C2+2FCsinφ (1)
R－ 2＝F2+C2－2FCsinφ (2)
Fsinφ＝Hsinθ (3)
the relative declination is calculated from the formulas (1), (2) and (3):
in the formula (4), the magnitude of the bias magnetic field C is:
and 5, calculating a geomagnetic field north direction component X, a geomagnetic field east direction component Y and a magnetic inclination angle I according to the pythagorean theorem by utilizing the geomagnetic total field F, the geomagnetic horizontal component H and the relative declination angle theta, so as to realize geomagnetic measurement.
Wherein, in the step 1, the distance between the two groups of suspension devices 2 is 10 meters; in the step 2, the measuring frequency of the geomagnetic total field F is 4 times/minute; in step 3, the measuring frequency of the geomagnetic horizontal component H is 6 times/minute; two measuring probes 5 are respectively positioned at the sphere center positions of the compensation spherical coil 3 and the offset spherical coil 4. Each measurement time of the tester host 1 is 7 seconds, the cooling time of the probe is removed, and the measurement can be performed for 6 times in one minute, so that the total geomagnetic field F is distributed for 2 times of measurement, the horizontal geomagnetic component H is measured for 2 times, and the synthetic bias magnetic field is measured for 2 times. Compared with the existing spherical coil measurement mode, the measurement frequency of the geomagnetic total field F is increased to 4 times/minute, and the measurement frequency of the geomagnetic horizontal component H is increased to 6 times/minute.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A geomagnetic measurement method based on a split type suspension spherical coil is characterized by comprising the following steps:
step 1, installing a measuring system, wherein the measuring system comprises a compensation spherical coil, a bias spherical coil, two groups of suspension devices, two measuring probes and a tester host, the compensation spherical coil and the bias spherical coil are respectively and independently installed in a suspension manner through the two groups of suspension devices, the two measuring probes are respectively arranged in the compensation spherical coil and the bias spherical coil, and the tester host is respectively and electrically connected with the two measuring probes, the compensation spherical coil and the bias spherical coil;
step 2, under the condition that power is not supplied to the compensation spherical coil, the tester host machine measures a total geomagnetic field F through the compensation spherical coil;
step 3, under the condition that the host computer of the tester supplies power to the compensation spherical coil, the compensation spherical coil forms a vertical magnetic field to offset the vertical component Z of the earth magnetism, and the value when the measured value reaches the lowest is recorded as the horizontal component H of the earth magnetism;
step 4, the tester host supplies power to the bias spherical coil, and the bias spherical coil applies a bias magnetic field C in the east-west direction－And C+The combined bias magnetic field of the bias magnetic field and the total geomagnetic field F is R－And R+Then, the following calculation formula is given:
R+ 2＝F2+C2+2FCsinφ (1)
R－ 2＝F2+C2－2FCsinφ (2)
Fsinφ＝Hsinθ (3)
the relative declination θ is calculated from the formulas (1), (2) and (3):
formula (4)The magnitude of the bias magnetic field C is:
step 5, calculating the rest parameters of the geomagnetism by using the total geomagnetic field F, the horizontal geomagnetic component H and the relative declination theta;
in step 1, the distance between the two groups of suspension devices is 10 meters.
2. The split type suspension spherical coil-based geomagnetic measurement method according to claim 1, wherein in the step 2, the measurement frequency of the geomagnetic total field F is 4 times/min.
3. The split type suspension spherical coil-based geomagnetic measurement method according to claim 1, wherein in the step 3, the measurement frequency of the geomagnetic horizontal component H is 6 times/min.
4. The split type suspension spherical coil-based geomagnetic measurement method according to claim 1, wherein the two measurement probes are respectively located at the spherical centers of the compensation spherical coil and the offset spherical coil.
5. The split type suspension spherical coil-based geomagnetic measurement method according to claim 1, wherein the other parameters of the geomagnetism comprise a geomagnetic north direction component X, a geomagnetic east direction component Y and a magnetic inclination angle I.
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