Magnetic field sensors, methods of detecting a magnetic field, and related magnetically responsive light propagating components and optical devices
US-2020348371-A1 · Nov 5, 2020 · US
Magneto-optical sensor for magnetic field measurement
US12498432B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12498432-B2 |
| Application number | US-202318508794-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 14, 2023 |
| Priority date | Feb 15, 2023 |
| Publication date | Dec 16, 2025 |
| Grant date | Dec 16, 2025 |
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Abstract
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A magneto-optical sensor can be used to measure electrical current with a very narrow pulse width as sensed by the magnetic field in the transmission line region of a pulsed power accelerator. Pulsed power accelerator experimental results agreed remarkably well with the Faraday effect theory, device physical model, and reference electrical current shunt data.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A magneto-optical sensor for magnetic field or electrical current measurement, comprising: a light source that provides a light beam; a first linear polarizer that produces a linearly polarized light beam from the light beam; a magneto-optical material that rotates the polarization of the linearly polarized light beam that propagates along an optical axis of the magneto-optical material to provide a rotated linearly polarized light beam whose rotation is dependent upon the strength of a magnetic field generated by an electrical current and applied parallel to the optical axis of the magneto-optical material; a second linear polarizer that transmits a light beam dependent upon the rotation of the polarization by the magneto-optical material; and a photodetector that measures the intensity of the transmitted light beam as a function of time, thereby providing a time-resolved measurement of the strength of the magnetic field. 2 . The magneto-optical sensor of claim 1 , wherein the light source comprises an infrared or visible laser. 3 . The magneto-optical sensor of claim 2 , wherein the infrared or visible laser comprises a 1550-nm or 532-nm fiber-coupled laser. 4 . The magneto-optical sensor of claim 1 , wherein the second linear polarizer is aligned orthogonal to the first linear polarizer. 5 . The magneto-optical sensor of claim 1 , wherein the magneto-optical material comprises a rare-earth-doped glass or rare-earth garnet crystal. 6 . The magneto-optical sensor of claim 5 , wherein the rare-earth garnet crystal comprises terbium gallium garnet or yttrium iron garnet. 7 . The magneto-optical sensor of claim 1 , wherein the magnetic-optical sensor is configured to measure a magnetic field or an electrical current in a vacuum transmission line of a pulsed power accelerator. 8 . The magneto-optical sensor of claim 1 , wherein the electric current comprises a continuous wave direct current. 9 . The magneto-optical sensor of claim 1 , wherein the electric current comprises a pulsed current.
Assignees
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Classifications
based on the Faraday, i.e. linear magneto-optic, effect · CPC title
using magneto-optic devices, e.g. Faraday {or Cotton-Mouton effect} · CPC title
- G01R33/0322Primary
using the Faraday or Voigt effect · CPC title
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- What does patent US12498432B2 cover?
- A magneto-optical sensor can be used to measure electrical current with a very narrow pulse width as sensed by the magnetic field in the transmission line region of a pulsed power accelerator. Pulsed power accelerator experimental results agreed remarkably well with the Faraday effect theory, device physical model, and reference electrical current shunt data.
- Who is the assignee on this patent?
- Nat Tech & Eng Solutions Sandia Llc
- What technology area does this patent fall under?
- Primary CPC classification G01R33/0322. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Dec 16 2025 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).