Magnetic field measurement apparatus and magnetic field measurement method

Patent metadata

Field	Value
Publication number	US-11933865-B2
Application number	US-202117794124-A
Country	US
Kind code	B2
Filing date	Feb 18, 2021
Priority date	Feb 28, 2020
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A magnetic resonance member 1 includes a crystal structure and is capable of electron spin quantum operations with microwaves of different frequencies corresponding to arrangement orientations of a vacancy and an impurity in a crystal lattice. A magnetic field transmission unit 4 senses a measurement target magnetic field at plural measurement positions different from each other, and applies application magnetic fields corresponding to the measurement target magnetic field sensed at the plural measurement positions to the magnetic resonance member 1 along respective different directions corresponding to the aforementioned arrangement orientations. A measurement control unit 21 controls a high frequency power supply 12 , and determines detection values detected by a detecting device (an irradiating device 5 and a light receiving device 6 ) of the physical phenomena corresponding to the plural measurement positions. A calculation unit 22 calculates the measurement target magnetic field at the plural measurement positions on the basis of the detection values.

First claim

The invention claimed is:

1. A magnetic field measurement apparatus, comprising:
a magnetic resonance member that includes a crystal structure and capable of electron spin quantum operations with microwaves of different frequencies corresponding to arrangement orientations of a vacancy and an impurity in a crystal lattice;
a high-frequency magnetic field generator that applies a magnetic field as a microwave to the magnetic resonance member;
a high frequency power supply that causes the high-frequency magnetic field generator to conduct a current for the microwave;
a magnetic field transmission unit that senses a measurement target magnetic field at plural measurement positions different from each other, and applies application magnetic fields corresponding to the measurement target magnetic field sensed at the plural measurement positions to the magnetic resonance member along respective different directions corresponding to the arrangement orientations;
a detecting device that detects physical phenomena corresponding to the application magnetic fields using the magnetic resonance member;
a measurement control unit that controls the high frequency power supply, and determines detection values detected by the detecting device of the physical phenomena corresponding to the plural measurement positions; and
a calculation unit that calculates the measurement target magnetic field at the plural measurement positions on the basis of the detection values.

2. The magnetic field measurement apparatus according to claim 1 , wherein the measurement control unit (a) controls the high frequency power supply in accordance with a predetermined measurement sequence and determines a detection value of a physical phenomenon corresponding to one of the plural measurement positions, and (b) sequentially performs the measurement sequence plural times of which the number is the same as the number of plural measurement positions and determines the detection values of the physical phenomena corresponding to the plural measurement positions.

3. The magnetic field measurement apparatus according to claim 2 , wherein the measurement control unit sets frequencies of currents of the high frequency power supply in the measurement sequence as frequencies corresponding to the measurement positions.

4. The magnetic field measurement apparatus according to claim 1 , wherein the magnetic field transmission unit is a flux transformer that includes primary coils and secondary coils, senses the measurement target magnetic field at the plural measurement positions different from each other using the primary coils and applies the application magnetic fields to the magnetic resonance member using the secondary coils, along respective different directions corresponding to the arrangement orientations.

5. The magnetic field measurement apparatus according to claim 2 , wherein the magnetic field transmission unit is a flux transformer that includes primary coils and secondary coils, senses the measurement target magnetic field at the plural measurement positions different from each other using the primary coils and applies the application magnetic fields to the magnetic resonance member using the secondary coils, along respective different directions corresponding to the arrangement orientations.

6. The magnetic field measurement apparatus according to claim 3 , wherein the magnetic field transmission unit is a flux transformer that includes primary coils and secondary coils, senses the measurement target magnetic field at the plural measurement positions different from each other using the primary coils and applies the application magnetic fields to the magnetic resonance member using the secondary coils, along respective different directions corresponding to the arrangement orientations.

7. A magnetic field measurement method, comprising the steps of:
(a) sensing a measurement target magnetic field at plural measurement position different from each other, and (b) applying application magnetic fields corresponding to the measurement target magnetic field sensed at the plural measurement positions to a magnetic resonance member along respective different directions corresponding to arrangement orientations of a vacancy and an impurity in a crystal lattice of the magnetic resonance member, the magnetic resonance member including a crystal structure and capable of electron spin quantum operations with microwaves of different frequencies corresponding to the arrangement orientations;
detecting physical phenomena corresponding to the application magnetic fields using the magnetic resonance member, and determining detection values of the physical phenomena corresponding to the plural measurement positions; and
calculating the measurement target magnetic field at the plural measurement positions on the basis of the detection values.

Assignees

• Sumida Corp
• Univ Kyoto

Inventors

• Yoshii Yoshiharu
• Hashimoto Masateru
• Ootsuka Tsutomu
• Hamada Shingo
• Takemura Yuki
• Hayashi Kan
• Mizuochi Norikazu

Classifications

• G01R33/24 Primary

  for measuring direction or magnitude of magnetic fields or magnetic flux · CPC title

• G01R33/26 Primary

  using optical pumping · CPC title

• G01N24/10

  by using electron paramagnetic resonance (G01N24/12 takes precedence) · CPC title