Devices, systems, and methods with optical pumping magnetometers for three-axis magnetic field sensing

US11604237B2 · kind B2 · utility

Assignee

• HI LLC · US

Inventors

• Micah Ledbetter · Sunnyvale, US
• Benjamin Shapiro · Washington, US
• Ethan Pratt · Santa Clara, US
• Ricardo Jiménez-Martínez · Culver City, US
• Argyrios Dellis · Allen, US
• Kayla Wright-Freeman · Inglewood, US
• Geoffrey Iwata · Los Angeles, US
• Michael Romalis · Princeton, US

Key dates

• Filing date: Jan 5, 2022
• Grant date: Mar 14, 2023
• Expiry date: Jan 5, 2042

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/7235
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A magnetic field measurement system includes a magnetometer having at least one vapor cell, at least one light source to direct at least two light beams through the vapor cell(s), and at least one detector; at least one magnetic field generator to modify an external magnetic field experienced by the vapor cell(s); and at least one processor configured for: applying a first modulation pattern, bmod(t), to the magnetic field generator(s) to modulate a magnetic field at the vapor cell(s), where bmod(t)=[cx cos(ωt)+sx sin(ωt), cy cos(ωt)+sy sin(ωt), cz cos(ωt)+sz sin(ωt)], where cx, sx, cy, sy, cz, and sz are amplitudes and ω is a frequency; directing the light source(s) to direct the light beams through the vapor cell(s); receiving signals from the detector(s); and determining three orthogonal components of the external magnetic field using the received signals. Multi-frequency modulation patterns can alternatively be used.