公开(公告)号：US20210278486A1

公开(公告)日：2021-09-09

申请号：US17189530

申请日：2021-03-02

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Masaki YAMADA ,  Koji TAKEMIYA

IPC: G01R33/26

Abstract: A optically pumped magnetometer includes a cell filled with an alkali metal; a pump light source that generates a pump light; a probe light source that generates a probe light; a signal output unit that obtains an output signal related to magnetism, which is received by the cell, based on the probe light which has passed through the cell; a coil unit that generates a static magnetic field along a pump optical axis in a region of disposition of the cell; and a computer that controls operation of the coil unit. The computer outputs a first control signal to set an intensity of the static magnetic field to a first intensity, and a second control signal to set the intensity of the static magnetic field to a second intensity different from the first intensity.

公开(公告)号：US20250164586A1

公开(公告)日：2025-05-22

申请号：US18839519

申请日：2022-10-19

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Norihisa KATO ,  Masaki YAMADA ,  Koji TAKEMIYA ,  Masato KITABAYASHI

IPC: G01R33/26 ,  G01R35/00

Abstract: A magnetometer module includes a cell, a pump laser light source, a photodiode configured to detect an intensity of pump light, a probe laser light source, a photodiode element configured to detect an intensity of probe light, a differential amplifier configured to generate a magnetism detection signal based on the probe light that has passed through the cell, and a control circuit configured to perform at least one of first determination processing of determining a driving condition of the light source based on the intensity of the pump light detected by the photodiode while controlling the light source and performing wavelength sweep on the pump light and second determination processing of determining a driving condition of the light source based on the intensity of the probe light detected by the photodiode element while controlling the light source and performing wavelength sweep on the probe light.