Magnetic field measurement systems and methods employing feedback loops with a loops with a low pass filter
US11480632B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2021 |
| Grant date | Oct 25, 2022 |
| Priority date | — |
| Expiry date | Apr 20, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0094
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field measurement system includes at least one magnetometer having a vapor cell, a light source to direct light through the vapor cell, and a detector to receive light directed through the vapor cell; at least one magnetic field generator disposed adjacent the vapor cell; and a feedback circuit coupled to the at least one magnetic field generator and the detector of the at least one magnetometer. The feedback circuit includes a first feedback loop that includes a first low pass filter with a first cutoff frequency and a second feedback loop that includes a second low pass filter with a second cutoff frequency. The first and second feedback loops are configured to compensate for magnetic field variations having a frequency lower than the first or second cutoff frequency, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.