US 12,032,046 B2
Sensor for measuring magnetic field by utilizing principle of optically detected magnetic resonance (ODMR)
Yuji Hatano, Tokyo (JP); Takayuki Iwasaki, Tokyo (JP); Mutsuko Hatano, Tokyo (JP); and Jaewon Shin, Susono (JP)
Assigned to TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP)
Filed by TOKYO INSTITUTE OF TECHNOLOGY, Tokyo (JP)
Filed on Dec. 27, 2022, as Appl. No. 18/146,984.
Claims priority of application No. 2021-213800 (JP), filed on Dec. 28, 2021.
Prior Publication US 2023/0204696 A1, Jun. 29, 2023
Int. Cl. G01R 33/32 (2006.01)
CPC G01R 33/323 (2013.01) 12 Claims
OG exemplary drawing
 
1. A sensor comprising:
a first magnetic sensor configured to detect a magnetic field around a measurement object when excitation light is emitted, and output at least one of a first magnetic field signal indicating the detected magnetic field and a first temperature signal indicating a temperature around the measurement object;
a second magnetic sensor configured to detect a magnetic field around a measurement object when excitation light is emitted, and output at least one of a second magnetic field signal indicating the detected magnetic field and a second temperature signal indicating a temperature around the measurement object;
an optical system configured to emit the excitation light to the first and second magnetic sensors; and
a processor configured to calculate a difference between the magnetic field corresponding to the first magnetic field signal and the magnetic field corresponding to the second magnetic field signal, wherein each of the first and second magnetic sensors comprises:
an element disposed around the measurement object and having color centers;
an antenna configured to radiate a microwave magnetic field to the element;
an optical sensor configured to detect an intensity of a fluorescence generated by the element, and outputting an intensity signal indicating the detected intensity; and
a controller configured to generate a microwave output to the antenna based on the intensity signal, calculate at least one of a magnetic field and temperature around the measurement object, and output at least one of a magnetic field signal indicating the calculated magnetic field and a temperature signal indicating the calculated temperature to the processor.