公开(公告)号：US10082545B2

公开(公告)日：2018-09-25

申请号：US14879769

申请日：2015-10-09

Applicant: RMIT University

Inventor： Jan Jeske ,  Andrew Greentree ,  Jared Cole

IPC: G01R33/032

CPC classification number: G01R33/032

Abstract: In general, techniques of this disclosure are directed to a sensor for measuring an external magnetic field. The sensor an optical cavity, a laser medium which together with the optical cavity has a laser threshold, a laser pump, and a radio-frequency (RF) drive applied to the laser medium, such that the laser threshold varies with a change in the external magnetic field. The RF drive may be applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the value of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output. Further, the intensity of the laser output may provide a measurement of the value of the external magnetic field.

公开(公告)号：US20170030982A1

公开(公告)日：2017-02-02

申请号：US14879769

申请日：2015-10-09

Applicant: RMIT University

Inventor： Jan Jeske ,  Andrew Greentree ,  Jared Cole

IPC: G01R33/032

CPC classification number: G01R33/032

Abstract: In general, techniques of this disclosure are directed to a sensor for measuring an external magnetic field. The sensor an optical cavity, a laser medium which together with the optical cavity has a laser threshold, a laser pump, and a radio-frequency (RF) drive applied to the laser medium, such that the laser threshold varies with a change in the external magnetic field. The RF drive may be applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the value of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output. Further, the intensity of the laser output may provide a measurement of the value of the external magnetic field.

Abstract translation: 通常，本公开的技术涉及用于测量外部磁场的传感器。 传感器是光腔，与光腔一起具有激光阈值的激光介质，激光泵和施加到激光介质的射频（RF）驱动，使得激光阈值随着 外部磁场。 RF驱动器可以在或围绕根据外部磁场而变化的特定谐振频率施加到激光介质，使得根据外部磁场的值，RF驱动器在至少两个状态之间引起转换 激光介质，每个状态在激光输出的强度下引起不同的激光阈值。 此外，激光输出的强度可以提供外部磁场的值的测量。

公开(公告)号：US20180259597A1

公开(公告)日：2018-09-13

申请号：US15748117

申请日：2016-07-27

Applicant: RMIT University

Inventor： Jan Jeske ,  Andrew Greentree ,  Jared Cole

IPC: G01R33/032

CPC classification number: G01R33/032

Abstract: A magneto-encephalography device including a plurality of laser threshold magnetometers for measuring a magnetic field is provided. Each laser threshold magnetometer includes an optical cavity, a laser medium which together with the optical cavity has a laser threshold; a laser pump; and a radio-frequency (RF) drive applied to the laser medium at or around a particular resonance frequency which varies depending on the magnetic field, such that depending on the value of the physical parameter, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output, wherein the intensity of the laser output provides a measurement of the magnitude of the magnetic field; wherein the laser threshold magnetometers are configured to be placed on a head of a subject to be monitored.