Nv center based microwave free and galvanically isolated magnetometer

A current sensor comprising a magnetometer comprising:

• a sensor element comprising at least one paramagnetic center that generates fluorescence radiation;
• a radiation receiver configured to receive the fluorescence radiation from the sensor element and generate a first electrical signal based on receiving the fluorescence radiation from the sensor element;
• and
• an electronic output circuit configured to generate and output a second electrical signal based on the first electrical signal;
• wherein:
• a value of the fluorescence radiation generated by the sensor element depends at least in part on a magnetic flux density at a location of the sensor element;
• and
• the magnetometer is configured to be placed near to a wire carrying a current to be measured or in direct contact with the wire carrying the current to be measured such that the current to be measured in the wire modifies the magnetic flux density at the location of the sensor element.