High precision field measurement method for geomagnetic vectors and a device thereof
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01V-003/00
G01V-003/40
G01V-001/00
E21B-010/00
출원번호
US-0906434
(2014-06-09)
등록번호
US-9910183
(2018-03-06)
우선권정보
CN-2013 1 0324884 (2013-07-30)
국제출원번호
PCT/CN2014/079467
(2014-06-09)
국제공개번호
WO2015/014161
(2015-02-05)
발명자
/ 주소
Gao, Jiandong
출원인 / 주소
CHINA METALLURGICAL GEOLOGY BUREAU GEOLOGICAL EXPLORATION INSTITUTE OF SHANDONG ZHENGYUAN
대리인 / 주소
Han IP Corporation
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
A tripod, a vertical coil and a total-field magnetometer are utilized to measure a geomagnetic field T0 without an additional magnetic field imposed, as well as two composite magnetic field values T−1 and T−2 when the geomagnetic field is added with a vertical upward magnetic field Tf and a double v
A tripod, a vertical coil and a total-field magnetometer are utilized to measure a geomagnetic field T0 without an additional magnetic field imposed, as well as two composite magnetic field values T−1 and T−2 when the geomagnetic field is added with a vertical upward magnetic field Tf and a double vertical upward magnetic field 2Tf, respectively. Calculate a vertical component Z, a horizontal component H and a geomagnetic inclination I of the geomagnetic field. Set up a horizontal coil such that a geometric center of the horizontal coil coincides with a geometric center of the vertical coil. Use the total-field magnetometer to measure two composite magnetic field values T+∥ and T−∥ after the geomagnetic field has been added with a horizontal forward magnetic field and a horizontal reverse magnetic field, respectively. Calculate a geomagnetic declination D.
대표청구항▼
1. A high precision field measurement method for geomagnetic vectors, the method comprising: using a tripod, a vertical coil and a total-field magnetometer to measure a geomagnetic field T0 without an additional magnetic field imposed;measuring two composite magnetic field values T−1 and T−2 when th
1. A high precision field measurement method for geomagnetic vectors, the method comprising: using a tripod, a vertical coil and a total-field magnetometer to measure a geomagnetic field T0 without an additional magnetic field imposed;measuring two composite magnetic field values T−1 and T−2 when the geomagnetic field is added with a vertical upward magnetic field Tf and is added with a double vertical upward magnetic field 2Tf, respectively;calculating a vertical component Z, a horizontal component H and a geomagnetic inclination I of the geomagnetic field as follows: Z=T-22-4T-12+3T028(T-22-2T-12+T02)H=T02-Z2cos(I)=HT0;setting up a horizontal coil such that a geometric center of the vertical coil coincides with a geometric center of the horizontal coil;using the total-field magnetometer to measure two composite magnetic field values T+∥ and T−∥ after the geomagnetic field has been added with a horizontal forward magnetic field and a horizontal reverse magnetic field, respectively; andcalculating a geomagnetic declination as follows: cos(D1)=T+//2-T-//2T0cos(I)8(T+//2+T-//2-2T02)GeomagneticdeclinationD=D0-D1:wherein D0 is an included angle between an axial line of the horizontal coil and a geographical north direction, a known preset value. 2. The high precision field measurement method for geomagnetic vectors of claims 1, the method further comprising: mounting the horizontal coil on the vertical coil such that the geometric center of the vertical coil coincides with the geometric center of the horizontal coil;placing the probe of the total-field magnetometer at a location where the geometric centers of the two coils coincide, wherein the horizontal coil is a Helmholtz coil;using the total-field magnetometer to measure the composite magnetic fields wherein the geomagnetic field has been added with a horizontal forward magnetic field T+∥ and a horizontal reverse magnetic field T−∥; andcalculating the geomagnetic declination as follows: cos(D1)=T+//2-T-//2T0cos(I)8(T+//2+T-//2-2T02)GeomagneticdeclinationD=D0-D1:wherein D0 is the included angle between the axial line of the horizontal coil and the geographic north direction, a known preset value. 3. A high precision field measurement method for geomagnetic vectors, the method comprising: using a tripod, a vertical coil and a total-field magnetometer to measure a geomagnetic field T0 without an additional magnetic field imposed;measuring two composite magnetic field values T−1 and T−2 when the geomagnetic field is added with a vertical upward magnetic field Tf and is added with a double vertical upward magnetic field 2Tf, respectively; andcalculating a vertical component Z, a horizontal component H and a geomagnetic inclination I of the geomagnetic field,wherein the method comprises the following steps:placing a probe of the total-field magnetometer inside the vertical coil and mounting the vertical coil on the tripod, wherein the vertical coil is a Helmholtz coil;connecting the vertical coil to an excitation power supply through a conducting wire, the excitation power supply provided with a wave-band switch thereon;adjusting the switch on the excitation power supply such that the excitation power supply does not power on the vertical coil, and using the total-field magnetometer to measure the geomagnetic field To without an additional magnetic field imposed;adjusting the switch on the excitation power supply such that the excitation power supply reversely powers on the vertical coil with a current intensity I, generating inside the vertical coil the vertical upward magnetic field Tf , and using the total-field magnetometer to measure the composite magnetic field T−1 of the magnetic field Tf and the geomagnetic field; andadjusting the switch on the excitation power supply such that the excitation power supply reversely powers on the vertical coil with a current intensity 2I, generating inside the vertical coil the vertical upward magnetic field 2Tf , using the total-field magnetometer to measure the composite magnetic field T−2 of the magnetic field 2Tf and the geomagnetic field; and using To, T−1 and T−2 to calculate the vertical component Z, the horizontal component H and the geomagnetic inclination I of the geomagnetic field as follows: Z=T-22-4T-12+3T028(T-22-2T-12+T02)H=T02-Z2cos(I)=HT0. 4. The high precision field measurement method for geomagnetic vectors of claim 3, further comprising the following steps: mounting a horizontal coil on the vertical coil such that a geometric center of the vertical coil coincides with a geometric center of the horizontal coil, and connecting the horizontal coil to the excitation power supply, wherein the horizontal coil is a Helmholtz coil;adjusting the switch on the excitation power supply such that the excitation power supply forwardly powers on the horizontal coil and generates a forward magnetic field, and using the total-field magnetometer to measure a composite magnetic field T+∥ of the forward magnetic field of the horizontal coil and the geomagnetic field;adjusting the switch on the excitation power supply such that the excitation power supply reversely powers on the horizontal coil and generates a reverse magnetic field, using the total-field magnetometer to measure a composite magnetic field T−∥ of the reverse magnetic field of the horizontal coil and the geomagnetic field, and using the measured values of To, T−1, T−2, T+∥ and T−∥ to calculate a geomagnetic declination D of the geomagnetic field, as follows: Z=T-22-4T-12+3T028(T-22-2T-12+T02)H=T02-Z2cos(I)=HT0cos(D1)=T+//2-T-//2T0cos(I)8(T+//2+T-//2-2T02)GeomagneticdeclinationD=D0-D1:wherein D0 is an included angle between an axial line of the horizontal coil and a geographic north direction, a known preset value. 5. A device for high precision field measurement of geomagnetic vectors, comprising: a tripod;a horizontal dial mounted on the tripod;a tumbler mounted on the horizontal dial;a fixed column mounted in the tumbler;a coil holder mounted on the fixed column;two half-shaft brackets mounted on the coil holder;two half-shafts each mounted at a top end of a respective one of the two half-shaft brackets;a vertical coil frame connected to each of the two half-shafts via a corresponding connecting plate;a horizontal coil frame connected with the vertical coil frame;a horizontal coil wound along the horizontal coil frame;a vertical coil wound along the vertical coil frame, with geometric centers of the vertical coil and the horizontal coil coinciding with each other;a coil excitation power supply connected to both the vertical coil and the horizontal coil through conducting wires; anda probe connected via a conducting wire to a total-field magnetometer, the probe mounted at a location where the geometric centers of the vertical coil and the horizontal coil coincide. 6. The device for high precision field measurement of geomagnetic vectors of claim 5, further comprising: a supporting plate mounted on the horizontal coil frame;two mutually orthogonal long glass level bubbles mounted on the supporting plate; anda plane on which the two long glass level bubbles are located is parallel with a plane of the vertical coil. 7. The device for high precision field measurement of geomagnetic vectors of claim 5, further comprising: a rotating base mounted at an upper end of the horizontal dial and around an outer periphery of the tumbler, with an upper-end surface of the rotating base connected with the coil holder, and with a locking bolt mounted on a side surface of the rotating base. 8. The device for high precision field measurement of geomagnetic vectors of claim 5, wherein the vertical coil frame and the horizontal coil frame mounted on the two half-shafts of the coil holder are mutually orthogonal, wherein the coil frames can vertically rotate by 180° around the horizontal half-shafts, and wherein the coil holder can horizontally rotate by 180° around the fixed column.
Honess Shawn B. (Portland OR) Narvaez Pablo (Los Angeles CA) McAuley James M. (Altadena CA), Precision measurement of magnetic characteristics of an article with nullification of external magnetic fields.
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