发明名称 |
CALIBRATION OF SENSITIVITY AND AXIAL ORTHOGONALITY FOR MAGNETOMETERS |
摘要 |
A reduced-cost apparatus for calibrating the sensitivity and orthogonality of a triaxial magnetometer, and a method for adjusting the distance between the two coils of a Helmholtz coil and other related parameters are described herein. A method can include positioning a calibrated magnetometer within a mounting fixture between two coils of a Helmholtz coil, the two coils arranged in mutually parallel planes and separated by the radius of the Helmholtz coil, the mounting fixture mounted such that a position of the mounting fixture is adjustable along an axis orthogonal to the mutually parallel planes; adjusting the position of the mounting fixture over at least some of the positions and measuring the magnetic field at each position to generate a set of magnetic field measurements associated with the positions; and adjusting the first distance based on the first set of magnetic field measurements. Additional apparatuses, systems, and methods are disclosed. |
申请公布号 |
US2016041234(A1) |
申请公布日期 |
2016.02.11 |
申请号 |
US201514716208 |
申请日期 |
2015.05.19 |
申请人 |
Halliburton Energy Services, Inc. |
发明人 |
Li Wenquan;Beste Randal Thomas;Hensarling Jesse Kevin;Roberson Brian;Farrah John Harrison;Vu Tony |
分类号 |
G01R33/00;G01V13/00 |
主分类号 |
G01R33/00 |
代理机构 |
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代理人 |
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主权项 |
1. A method comprising:
positioning a calibrated magnetometer within a mounting fixture between two coils of a Helmholtz coil, the two coils arranged in mutually parallel planes and being separated by a distance equal to an estimated radius of the Helmholtz coil, the mounting fixture being mounted such that a position of the mounting fixture is adjustable to a plurality of positions along a center axis of the Helmholtz coil that is orthogonal to the mutually parallel planes; adjusting the position of the mounting fixture between the two coils over at least a subset of the plurality of positions; providing an excitation signal to the Helmholtz coil, subsequent to adjusting the position of the mounting fixture to each of the plurality of positions, to generate a magnetic field at the calibrated magnetometer; measuring the magnetic field using the calibrated magnetometer to generate a first set of magnetic field measurements associated with the plurality of positions; and adjusting the distance between the two coils based on the first set of magnetic field measurements. |
地址 |
Houston TX US |