Abstract: Various embodiments disclosed herein comprise systems and methods to arrange magnetic field sensors. In some examples a magnetic field detection system comprises a sensor holder and magnetometers. The sensor holder mounts the magnetometers proximate to a magnetic field source that generates a magnetic field. The magnetometers measure the magnetic field in multiple directions. A first portion of the magnetometers measures a normal component of the magnetic field and a first tangential component of the magnetic field, and a second portion of the magnetometers measures the normal component of the magnetic field and a second tangential component of the magnetic field. The sensor holder distributes the first portion of the magnetometers and the second portion of the magnetometers, so the tangential components measured by neighboring ones of the magnetometers mounted to the sensor holder are orthogonal.

Abstract: Various embodiments comprise a system to sense magnetic fields along x, y, and z measurement axes of a single-beam magnetometer. The x-axis is parallel to the propagation direction of the magnetometer light beam while the y and z axes are orthogonal to the light beam and to each other. The system comprises processing circuitry that processes the signal from the magnetometer to generate a z-axis control signal for a z-axis compensation coil. The processing circuitry processes the signal to generate a y-axis control signal for a y-axis compensation coil. The processing circuitry modifies y-axis current to drive the y-axis compensation coil based on the y-axis control signal and a modulation pattern. The processing circuitry delivers the modified y-axis current to the y-axis compensation coil to mitigate background magnetic field. The processing circuitry estimates magnetic field components along the x-axis based on the z-axis control signal and the modulation pattern.

Abstract: Various embodiments comprise a magnetic field compensation system. In some examples, the system comprises one or more coil drivers, magnetic field coils, and one or more magnetic field sensors. The one or more coil drivers supply a current to the magnetic field coils to generate a magnetic field. The magnetic field coils receive the current and generate the magnetic field. The magnetic field coils may be arranged in an array. The magnetic field coils individually comprise at least one coil trace pattern that encloses an area. The one or more magnetic field sensors measure the magnetic field generated by the magnetic field coils at a location proximate to the magnetic field coils.

Abstract: Various embodiments comprise a thermally packaged atomic device. The thermally packaged atomic device comprises an atomic vapor cell, a heater, and an enclosure. The atomic vapor cell is located within the enclosure. The heater heats the atomic vapor cell. The enclosure is filled with a gas selected for comprising a thermal conductivity less than air. The gas comprising a thermal conductivity less than air may comprise xenon or krypton. The enclosure surrounds the atomic vapor cell with the gas.

Abstract: Various embodiments disclosed herein comprise systems and methods to conform magnetic field sensors to a target geometry. In some examples, an apparatus is configured to conform to a target geometry. The apparatus comprises a sensor mount and a sensor array. The sensor mount comprises a flexible state for a first environmental condition and a rigid state for a second environmental condition. The sensor mount transitions from the flexible state to the rigid state when the first environmental condition transitions to the second environmental condition. The sensor mount transitions from the rigid state to the flexible state when the second environmental condition transitions to the first environmental condition. The sensor array is coupled to the sensor mount.

Abstract: Various embodiments comprise an apparatus to mitigate Electrostatic Discharge (ESD) buildup. In some examples, the apparatus comprises an Optically Pumped Magnetometer (OPM) and a connector. The connector is operatively coupled to the OPM. The OPM is configured to sense magnetic fields. The connector comprises a protective shorting link. The connector is configured to disconnect the protective shorting link in response to coupling and to connect the protective shorting link in response to decoupling.

Abstract: An Optically Pumped Magnetometer (OPM) system is configured to characterize a magnetic field. The OPM system comprises an OPM sensor that is coupled to an OPM cable that is coupled to an OPM connector that is detachably coupled to an OPM controller. The OPM connector stores OPM operational data. The OPM controller reads the OPM operational data when the OPM connector is coupled to an OPM controller. The OPM controller generates sensor control signals based on the OPM operational data and transfers the control signals to the OPM sensor. The OPM sensors characterize the magnetic field in response to the sensor control signals and transfer output signals that characterize the magnetic field to the OPM controller. The OPM controller models the magnetic field based on the output signals and transfers new OPM operational data to OPM connector. The OPM connector stores the new OPM operational data in the memory.

Abstract: Various embodiments disclosed herein comprise systems and methods to locate magnetic field sensors. In some examples, a system comprises a controller, a sensor mount, a coil set comprising one or more coils, and a magnetic field sensor. The sensor mount mounts the magnetic field sensor and constrains at least one degree of freedom of the magnetic field sensor in position or orientation. The controller supplies electric current to the coil set. The coil set generates magnetic waves that form at least one coil magnetic field in response to receiving the current. The magnetic field sensor measures the strength of the coil magnetic field. The controller locates the magnetic field sensor based on the constraint and the measured strength of the coil magnetic field.

Abstract: Various embodiments comprise systems and methods to model the shape of a target subject to coregister an image generated by an on-subject sensor array to the anatomy of the subject. In some examples, a system constrains sensors to follow the contour of the target subject. The system generates a surface contour representation of the target subject based on the locations of the individual ones of the sensors. The system fits the surface contour representation of the target subject to an outer surface feature of an anatomical scan.

Abstract: Various embodiments comprise a magnetic field compensation system. In some examples, the system comprises one or more coil drivers, magnetic field coils, and one or more magnetic field sensors. The one or more coil drivers supply a current to the magnetic field coils to generate a magnetic field. The magnetic field coils receive the current and generate the magnetic field. The magnetic field coils may be arranged in an array. The magnetic field coils individually comprise at least one coil trace pattern that encloses an area. The one or more magnetic field sensors measure the magnetic field generated by the magnetic field coils at a location proximate to the magnetic field coils.

Abstract: An Optically Pumped Magnetometer (OPM) system is configured to characterize a magnetic field. The OPM system comprises an OPM sensor that is coupled to an OPM cable that is coupled to an OPM connector that is detachably coupled to an OPM controller. The OPM connector stores OPM operational data. The OPM controller reads the OPM operational data when the OPM connector is coupled to an OPM controller. The OPM controller generates sensor control signals based on the OPM operational data and transfers the control signals to the OPM sensor. The OPM sensors characterize the magnetic field in response to the sensor control signals and transfer output signals that characterize the magnetic field to the OPM controller. The OPM controller models the magnetic field based on the output signals and transfers new OPM operational data to OPM connector. The OPM connector stores the new OPM operational data in the memory.

Abstract: A calibration system and method is described to continuously measure and adjust several parameters of a magnetic imaging array. One or more non-target magnetic field source(s) are used to generate a well-defined and distinguishable spatial magnetic field distribution. The magnetic imaging array is used to measure the strength of the non-target magnetic fields and the information is used to calibrate several parameters of the array, such as, but not limited to, effective magnetometer positions and orientations, gains and their frequency dependence, bandwidth, and linearity. The calibration can happen continuously or periodically, while the imaging array is operating to create magnetic field images, if the modulation frequencies for calibration are outside the frequency window of interest.

Abstract: A system and method to measure a magnetic gradient field with an optically-pumped magnetometer is described. Atoms are spin polarized at two locations. Larmor frequencies are, induced and the spin frequency is detected. The frequencies are proportional to the total magnetic field at the locations of the atoms. The magnetic field gradient is extracted from the beat frequency of the two Larmor frequencies.

Abstract: A mutually calibrated magnetic imaging array system is described. The system includes a non-target magnetic source rigidly attached to a magnetometer, and an attached control unit to measure and adjust several parameters of a magnetic imaging array. A non-target magnetic field source is used to generate a well-defined and distinguishable spatial magnetic field distribution. The source is rigidly attached directly to a magnetometer, while the relative positions of the magnetometers are unknown. The magnetic imaging array is used to measure the strength of the non-target source magnetic fields and the information is used to calibrate several parameters of the array, such as, but not limited to, effective magnetometer positions and orientations with respect to each other and cross-talk between the magnetometers. The system, and method described herein eliminates the need for a separate calibration phantom.