A5017598587- Atomic and Subatomic Physics Research
- Advanced MRI Techniques and Applications
- Advanced NMR Techniques and Applications
- Quantum optics and atomic interactions
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Magnetic Field Sensors Techniques
- Magnetic Bearings and Levitation Dynamics
- Quantum, superfluid, helium dynamics
- Inertial Sensor and Navigation
- Particle Accelerators and Free-Electron Lasers
- Mechanical and Optical Resonators
- Non-Destructive Testing Techniques
- NMR spectroscopy and applications
- Sensor Technology and Measurement Systems
- Earthquake Detection and Analysis
- Gyrotron and Vacuum Electronics Research
- Geotechnical and Geomechanical Engineering
- Photonic and Optical Devices
- Dark Matter and Cosmic Phenomena
- Magnetic Properties of Alloys
- Electric Motor Design and Analysis
- Fetal and Pediatric Neurological Disorders
- Hemodynamic Monitoring and Therapy
- Congenital Heart Disease Studies
University of Wisconsin–Madison
2015-2023
Bucknell University
2019
Northrop Grumman (United States)
2012-2018
Sensor Development (United States)
2012-2018
Various theories beyond the standard model predict new particles with masses in sub-eV range very weak couplings to ordinary matter. A $P$-odd and $T$-odd interaction between polarized unpolarized nucleons proportional $\stackrel{\ensuremath{\rightarrow}}{K}\ifmmode\cdot\else\textperiodcentered\fi{}\stackrel{\ensuremath{\rightarrow}}{r}$ is one such possibility, where $\stackrel{\ensuremath{\rightarrow}}{r}$ distance $\stackrel{\ensuremath{\rightarrow}}{K}$ spin of nucleon. Such an involving...
We demonstrate a new approach to precision NMR with hyperpolarized gases designed mitigate shifts due the alkali spin-exchange field. The bias field is implemented as sequence of (Rb) 2π pulses, allowing Rb polarization be optically pumped transverse When modulated at noble-gas (Xe) resonance, collisions buildup precessing Xe polarization. study and novel broadening effects oscillating Spin-exchange frequency are suppressed 2500×, magnetometer gain measurements project photon shot-noise...
In this work we demonstrate a high sensitivity atomic gradiometer capable of operation in earth-field level environments. We apply light-pulse sequence at four times the Larmor frequency to achieve <20 fT/cm/$\sqrt{\rm Hz}$ finite field strength 22 $\mu$T. The experimental timing can be tuned magnitude interest. Our one dimensional all-optical performs differential measurement between two regions single vapor cell on 4 cm baseline. results pave way for extensions higher dimensions, vector...
Information on the Nuclear Magnetic Resonance Gyro under development by Northrop Grumman Corporation is presented. The basics of Operation are summarized, a review completed phases presented, and current state progress in phase 4 discussed. Many details have been left out for sake brevity, but principles still complete.
We demonstrate a transversely polarized spin-exchange pumped noble gas comagnetometer which suppresses systematic errors from longitudinal polarization. Rb atoms as well $^{131}$Xe and $^{129}$Xe nuclei are simultaneously perpendicular to pulsed bias field. Both Xe isotopes' nuclear magnetic resonance conditions satisfied by frequency modulation of the pulse repetition rate. The detect precession. highlight importance magnetometer phase shifts when performing comagnetometry. For detection...
Atomic magnetometers (AMs) offer many advantages over superconducting quantum interference devices due to, among other things, having comparable sensitivity while not requiring cryogenics. One of the major limitations AMs is challenge configuring them as gradiometers. We report development a spin-exchange relaxation free vector atomic magnetic gradiometer with 3 fT cm-1 Hz-1/2 and common mode rejection ratio >150 in band from DC to 100 Hz. introduce background suppression figure merit for...
Spin-exchange relaxation-free (SERF) optical atomic magnetometers are a promising alternative to superconducting quantum interference devices (SQUIDs) for biomedical applications, as they do not require liquid-helium cryogenics or shielded room. However, their sensitivity in the 0.1--100 Hz range is undermined by $1/f$ noise. The authors present vector SERF magnetometer with suppressed noise, due ac response along each of its two sensitive axes. improved long-term stability this system...
Information on the Nuclear Magnetic Resonance Gyro (NMRG) under development by Northrop Grumman Systems Corporation in collaboration with Freedom Photonics is presented. The basics principles of Operation are summarized and current state discussed. Many details have been left out for sake brevity, but still complete. Recently encountered fabrication performance challenges also
Northrop Grumman Navigation Systems Division is developing an atom-based magnetometer technology that has the potential for providing a global position reference independent of GPS. The NAV-CAM sensor direct outgrowth Nuclear Magnetic Resonance Gyro under development by same technical team. It will be only known magnetic field capable all 3 axes vector direction and magnitude simultaneously with whole-field scalar measurement, within single multi-axis sensing element measuring 4 mm cube or...
Information on the Nuclear Magnetic Resonance Gyro under development by Northrop Grumman Corporation is presented. The basics of Operation are summarized, a review completed phases presented, and current state progress in phase 4 discussed. Many details have been left out for sake brevity, but principles still complete.
Northrop Grumman is developing an atom-based magnetometer technology that has the potential for providing a global position reference independent of GPS. The NAV-CAM sensor direct outgrowth Nuclear Magnetic Resonance Gyro under development by same technical team. It capable simultaneous measurements all 3 orthogonal axes magnetic vector field components using single compact vapor cell. sum determination whole-field scalar measurement achieves similar precision to individual components. By...
In this work, we look to compare three methods of feedback for the ultimate purpose measuring transverse vector components a magnetic field using synchronous light-pulse atomic scalar magnetometer with few tens fT/Hz sensitivity in Earth-field-scale environments. By applying modulation orthogonal axes, respective may, principle, be separated from measurement. Success technique depends significant part on ability measure and respond these perturbations low measurement uncertainty. Using...
We are implementing a new design for spinexchange- pumped NMR gyros that addresses the key systematic errors as compared to previous implementations. The concept is drive magnetic resonance using spin-exchange collisions in reference frame rotating about bias field. resulting purely transverse polarization predicted be insensitive field shifts and quadrupole interactions, both of which prominent designs based on conventional resonance. Preliminary studies have identified novel type...