US 12,442,872 B2
Magnetic field gradiometer
Robert Roelver, Calw (DE); Stefan Hengesbach, Stuttgart (DE); and Michael Foertsch, Ansbach (DE)
Assigned to Q.ANT GMBH, Stuttgart (DE)
Filed by Q.ant GmbH, Stuttgart (DE)
Filed on Dec. 29, 2023, as Appl. No. 18/400,195.
Application 18/400,195 is a continuation of application No. PCT/EP2022/065637, filed on Jun. 9, 2022.
Claims priority of application No. 10 2021 206 954.1 (DE), filed on Jul. 2, 2021.
Prior Publication US 2024/0133979 A1, Apr. 25, 2024
Prior Publication US 2024/0230794 A9, Jul. 11, 2024
Int. Cl. G01R 33/032 (2006.01); G01R 33/02 (2006.01); G01R 33/022 (2006.01)
CPC G01R 33/032 (2013.01) [G01R 33/0206 (2013.01); G01R 33/022 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A magnetic field gradiometer for determining a magnetic field gradient, the magnetic field gradiometer comprising:
at least one excitation light source for emitting excitation light,
two spatially spaced-apart measuring areas for magnetic field measurement, wherein color centers in diamond are arranged in the two measuring areas, the color centers emit fluorescent light upon excitation using the excitation light,
at least one microwave emitter for applying at least one microwave field to the spatially spaced-apart measuring areas,
two detectors for detecting the fluorescent light from the two spatially spaced-apart measuring areas, and
an evaluator for determining the magnetic field gradient based on the fluorescent light detected by the two detectors,
wherein the two measuring areas are configured as freestanding measuring waveguides of a common diamond crystal, wherein the diamond crystal is used as a substrate for the measuring waveguides.