Method for Measuring Magnetic Field Gradients
US-2017336480-A1 · Nov 23, 2017 · US
Integrated fluxgate magnetic gradient sensor
US10459040B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10459040-B2 |
| Application number | US-201615162776-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 24, 2016 |
| Priority date | May 27, 2015 |
| Publication date | Oct 29, 2019 |
| Grant date | Oct 29, 2019 |
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Abstract
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An integrated fluxgate magnetic gradient sensor includes a common mode sensitive fluxgate magnetometer and a differential mode sensitive fluxgate magnetometer. The common mode sensitive fluxgate magnetometer includes a first core adjacent to a second core. The first and second cores are wrapped by a first excitation wire coil configured to receive an excitation current that affects a differential mode magnetic field. The differential mode sensitive fluxgate magnetometer includes a third core adjacent to the first core and a fourth core adjacent to the second core. The third and fourth cores are wrapped by a second excitation wire coil configured to receive an excitation current that affects a common mode magnetic field.
First claim
Opening claim text (preview).
The invention claimed is: 1. An integrated fluxgate magnetic gradient sensor, comprising: a common mode sensitive fluxgate magnetometer including a first core adjacent to a second core, the first and second cores wrapped by a first excitation wire coil configured to receive a first excitation current that affects a differential mode magnetic field; a differential mode sensitive fluxgate magnetometer including a third core adjacent to the first core and a fourth core adjacent to the second core, the third and fourth cores wrapped by a second excitation wire coil configured to receive a second excitation current that affects a common mode magnetic field; and a differential voltage driver coupled to the common mode sensitive fluxgate magnetometer and the differential mode sensitive fluxgate magnetometer and configured to drive a first compensation current through a first compensation wire coil wrapped around the first core and the second core and a second compensation wire coil wrapped around the third core and the fourth core. 2. The integrated fluxgate magnetic gradient sensor of claim 1 , wherein the common mode sensitive fluxgate magnetometer further includes a common mode sense wire coil configured to output a voltage proportional to a common mode magnetic field. 3. The integrated fluxgate magnetic gradient sensor of claim 2 , wherein the voltage across the common mode sense wire coil corresponds to a sum of field change in the first and second cores of the common mode sensitive fluxgate magnetometer. 4. The integrated fluxgate magnetic gradient sensor of claim 1 , wherein the differential mode sensitive fluxgate magnetometer further includes a differential mode sense wire coil configured to output a voltage proportional to a differential mode magnetic field. 5. The integrated fluxgate magnetic gradient sensor of claim 4 , wherein the voltage across the differential mode sense wire coil corresponds to a difference in field changes in the third and fourth cores of the differential mode sensitive fluxgate magnetometer. 6. The integrated fluxgate magnetic gradient sensor of claim 1 , further comprising a single-ended voltage driver coupled to the differential mode sensitive fluxgate magnetometer and configured to drive a second compensation current through the second compensation wire coil. 7. The integrated fluxgate magnetic gradient sensor of claim 6 , wherein the common mode sensitive fluxgate magnetometer further includes a common mode sense wire coil and an input to the differential voltage driver is a voltage across the common mode sense wire coil. 8. The integrated fluxgate magnetic gradient sensor of claim 6 , wherein the differential mode sensitive fluxgate magnetometer further includes a differential mode sense wire coil and an input to the single-ended voltage driver is a voltage across the differential mode sense wire coil.
Assignees
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Classifications
- G01R33/022Primary
Measuring gradient · CPC title
using the flux-gate principle · CPC title
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Frequently asked questions
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- What does patent US10459040B2 cover?
- An integrated fluxgate magnetic gradient sensor includes a common mode sensitive fluxgate magnetometer and a differential mode sensitive fluxgate magnetometer. The common mode sensitive fluxgate magnetometer includes a first core adjacent to a second core. The first and second cores are wrapped by a first excitation wire coil configured to receive an excitation current that affects a differenti…
- Who is the assignee on this patent?
- Texas Instruments Inc
- What technology area does this patent fall under?
- Primary CPC classification G01R33/022. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 29 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).