公开(公告)号：US12174020B2

公开(公告)日：2024-12-24

申请号：US17333474

申请日：2021-05-28

Applicant: The Trustees of Princeton University

Inventor： Wonjae Lee ,  Michael Romalis ,  Vito Giovanni Lucivero ,  Mark Limes ,  Elizabeth Foley ,  Tom Kornack

IPC: G01R33/26 ,  G01C17/28

Abstract: According to various embodiments, a method for reducing heading error in a magnetometer that uses Rb-87 atoms is disclosed. The method includes varying a direction and magnitude of a magnetic field at different spin polarization regimes. According to various embodiments, a magnetometer adapted for reduced heading error is disclosed. The magnetometer includes a multipass cell containing Rb-87 vapor, a pump laser operated in a pulse mode that is synchronous with a Larmor frequency, and two orthogonal probe lasers configured to rotate to vary a direction and magnitude of a magnetic field at different spin polarization regimes.

公开(公告)号：US20220221277A1

公开(公告)日：2022-07-14

申请号：US17333474

申请日：2021-05-28

Applicant: The Trustees of Princeton University

Inventor： Wonjae Lee ,  Michael Romalis ,  Vito Giovanni Lucivero ,  Mark Limes ,  Elizabeth Foley ,  Tom Kornack

IPC: G01C17/28 ,  G01R33/26

Abstract: According to various embodiments, a method for reducing heading error in a magnetometer that uses Rb-87 atoms is disclosed. The method includes varying a direction and magnitude of a magnetic field at different spin polarization regimes. According to various embodiments, a magnetometer adapted for reduced heading error is disclosed. The magnetometer includes a multipass cell containing Rb-87 vapor, a pump laser operated in a pulse mode that is synchronous with a Larmor frequency, and two orthogonal probe lasers configured to rotate to vary a direction and magnitude of a magnetic field at different spin polarization regimes.

公开(公告)号：US11953569B2

公开(公告)日：2024-04-09

申请号：US17519826

申请日：2021-11-05

Applicant: The Trustees of Princeton University

Inventor： Michael Romalis ,  Nezih Dural ,  Vito-Giovanni Lucivero ,  Wonjae Lee

IPC: G01R33/26 ,  G02B5/30 ,  G02B17/00 ,  G02B17/06 ,  G02B27/28 ,  G02B27/30

CPC classification number: G01R33/26 ,  G02B17/004 ,  G02B17/0626 ,  G02B5/3083 ,  G02B27/283 ,  G02B27/30

Abstract: According to various embodiments, a direct magnetic gradiometer having intrinsic subtraction of rotation signals from two oppositely polarized atomic ensembles within a single multi-pass cell is disclosed. The gradiometer includes three convex spherical mirrors aligned in a V-shape geometry. The three convex spherical mirrors include a front mirror and two back mirrors. The gradiometer further includes a probe laser beam. The laser beam is configured to be initially focused at a near-zero angle into a hole at a center of the front mirror such that the laser beam expands at the back mirrors and nearly overlaps with itself while undergoing multiple reflections between the front and back mirrors. The laser beam is further configured to be refocused to the front mirror at different spots in a number equal to half of total beam passes before exiting.

公开(公告)号：US20220137162A1

公开(公告)日：2022-05-05

申请号：US17519826

申请日：2021-11-05

Applicant: The Trustees of Princeton University

Inventor： Michael Romalis ,  Nezih Dural ,  Vito-Giovanni Lucivero ,  Wonjae Lee

IPC: G01R33/26 ,  G02B17/06 ,  G02B17/00

Abstract: According to various embodiments, a direct magnetic gradiometer having intrinsic subtraction of rotation signals from two oppositely polarized atomic ensembles within a single multi-pass cell is disclosed. The gradiometer includes three convex spherical mirrors aligned in a V-shape geometry. The three convex spherical mirrors include a front mirror and two back mirrors. The gradiometer further includes a probe laser beam. The laser beam is configured to be initially focused at a near-zero angle into a hole at a center of the front mirror such that the laser beam expands at the back mirrors and nearly overlaps with itself while undergoing multiple reflections between the front and back mirrors. The laser beam is further configured to be refocused to the front mirror at different spots in a number equal to half of total beam passes before exiting.

公开(公告)号：US10852371B2

公开(公告)日：2020-12-01

申请号：US15780322

申请日：2016-12-01

Applicant: The Trustees of Princeton University ,  Michael Romalis ,  Haifeng Dong ,  Andrei Baranga

Inventor： Michael Romalis ,  Haifeng Dong ,  Andrei Baranga

IPC: G01R33/26 ,  G01R33/032 ,  G01R33/02

Abstract: Disclosed is a method and apparatus relating generally to scalar atomic magnetometers. The disclosed methods and apparatus utilize a pressurized sample chamber and a high frequency pulsed pump laser to increase spin polarization and significantly suppress heading errors. These methods and apparatus may also include alternating polarization of the pump light between pulses.