Method for measuring an electrical current and current sensor

Patent metadata

Field	Value
Publication number	US-10488470-B2
Application number	US-201615571357-A
Country	US
Kind code	B2
Filing date	Mar 8, 2016
Priority date	May 4, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

The disclosure relates to a method for measuring a current using a diamond material. The diamond material has at least one nitrogen deposit and an imperfection in a crystal lattice of the diamond material, adjacent to the nitrogen deposit. The method comprises a providing step, a detecting step and an evaluating step. In the providing step, electromagnetic waves are provided to excite the diamond material. In the evaluating step, an intensity of a fluorescence of the diamond material is detected. In the evaluating step, the intensity and a frequency of the electromagnetic waves are evaluated in order to determine a magnetic field strength influencing the fluorescence.

First claim

The invention claimed is:

1. A method for measuring an electric current producing a magnetic field, using a diamond material which is exposed to the magnetic field, the diamond material having at least one nitrogen intercalation and a vacancy in a crystal lattice of the diamond material which is adjacent to the nitrogen intercalation, the method comprising:
exciting the diamond material to fluorescence by providing first electromagnetic waves in a first frequency spectrum and second electromagnetic waves in a second frequency spectrum;
detecting a fluorescence intensity of the fluorescence;
ascertaining a magnetic field strength of the magnetic field influencing the fluorescence by evaluating the fluorescence intensity and a frequency of the second electromagnetic waves the ascertaining of the magnetic field strength comprising:
evaluating a first local intensity minimum of the fluorescence at a first frequency of the second electromagnetic waves;
evaluating a second local intensity minimum of the fluorescence at a second frequency of the second electromagnetic waves; and
ascertaining the magnetic field strength based on a frequency spacing between the first and second frequencies; and

determining a current intensity of the electric current based on the magnetic field strength.

2. The method as claimed in claim 1 , wherein:
the exciting of the diamond material further comprises irradiating the second electromagnetic waves as a frequency profile;
the detecting of the fluorescence intensity further comprises detecting an intensity profile of the fluorescence; and
the ascertaining of the magnetic field strength further comprises ascertaining the magnetic field strength based on a relationship between the frequency profile and the intensity profile.

3. The method as claimed in claim 1 , the exciting of the diamond material further comprising:
exciting the diamond material using light and microwave energy.

4. The method as claimed in claim 1 , wherein:
the exciting of the diamond material further comprises exciting the diamond material to a reference fluorescence by providing a reference magnetic field having a reference field strength and a reference field direction; and
the ascertaining of the magnetic field strength further comprises ascertaining the magnetic field strength based on the reference field strength and the reference field direction.

5. The method as claimed in claim 1 further comprising:
maintaining the fluorescence by filtering an emission of the diamond material.

6. The method as claimed in claim 1 further comprising:
ascertaining a temperature of the diamond material based on a frequency shift of local minima of the fluorescence intensity.

7. A current sensor for measuring an electric current producing a magnetic field, the current sensor comprising:
a diamond material which is exposed to the magnetic field, the diamond material having at least one nitrogen intercalation and a vacancy in a crystal lattice of the diamond material which is adjacent to the nitrogen intercalation;
an emitter configured to excite the diamond material to fluorescence by providing first electromagnetic waves in a first frequency spectrum and second electromagnetic waves in a second frequency spectrum, the second electromagnetic waves being irradiated as a frequency profile;
a sensor configured to detect a fluorescence intensity profile of the fluorescence;
an evaluating device configured to ascertain a magnetic field strength of the magnetic field based on a relationship between the frequency profile and the fluorescence intensity profile; and
a determining device configured to determine a current intensity of the electric current based on the magnetic field strength.

8. A non-transitory computer program for measuring an electric current producing a magnetic field, using a diamond material which is exposed to the magnetic field, the diamond material having at least one nitrogen intercalation and a vacancy in a crystal lattice of the diamond material which is adjacent to the nitrogen intercalation, the computer program being configured to at least one of carry out, implement, and control:
excitation of the diamond material to fluorescence by providing first electromagnetic waves in a first frequency spectrum and second electromagnetic waves in a second frequency spectrum;
detection of a fluorescence intensity of the fluorescence;
ascertainment a magnetic field strength of the magnetic field influencing the fluorescence by evaluating the fluorescence intensity and a frequency of the second electromagnetic waves, the ascertainment of the magnetic field strength comprising:
evaluation a first local intensity minimum of the fluorescence at a first frequency of the second electromagnetic waves;
evaluation a second local intensity minimum of the fluorescence at a second frequency of the second electromagnetic waves; and
ascertainment the magnetic field strength based on a frequency spacing between the first and second frequencies; and

determination of a current intensity of the electric current based on the magnetic field strength.

9. The non-transitory computer program according to claim 8 , wherein the computer program is stored on a machine-readable storage medium.

Assignees

• Bosch Gmbh Robert

Inventors

• Lutz Theresa
• Schatz Frank
• Roelver Robert

Classifications

• G01R33/032 Primary

  using magneto-optic devices, e.g. Faraday {or Cotton-Mouton effect} · CPC title

• G01R15/245

  using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect · CPC title

• G01R33/1284

  Spin resolved measurements; Influencing spins during measurements, e.g. in spintronics devices · CPC title

• G01R33/12

  Measuring magnetic properties of articles or specimens of solids or fluids (involving magnetic resonance G01R33/20) · CPC title