Quantum magnetometers based on optical pumping can achieve sensitivity as high as what SQUID-based devices can attain. In this paper, we discuss the principle of operation and the optimal design of an optically pumped quantum magnetometer. The ultimate intrinsic sensitivity is calculated showing that optimal performance of the magnetometer is attained with an optical pump power of 20 μW and an ...

We present a portable four-channel atomic magnetometer array operating in the spin-exchange relaxation-free regime. The magnetometer array has several design features intended to maximize its suitability for biomagnetic measurement, specifically foetal magnetocardiography, such as a compact modular design and fibre-coupled lasers. The modular design allows the independent positioning and orient...

ABSTRACT A 3-axis magnetometer has been constructed using 3 Spin Dependent Tunneling (SDT) magnetic field sensors as transducers. This magnetometer has been designed for use in low frequency applications such as vehicle detection, security, and Unattended Ground Sensor (UGS). As such, there has been an emphasis on low cost, size, and power. The present version is smaller than previous versions,...

A finite-field optical magnetometer is demonstrated that suppresses spin-exchange collisions by dressing the atoms in a sequence of transverse AC-coupled 2π pulses. In the limit of short pulses, the attainable transverse polarization is unity. On resonance, the dressing field cancels the DC magnetic field, further suppressing spinexchange relaxation as compared to light-narrowed magnetometers. ...

This work details the construction and optimization of a fully automated, custom-built, remote controlled vibrating sample magnetometer for use in spintronics related research teaching. Following calibration by standard 6 mm diameter Ni disc with known magnetic moment, hysteresis measurements Nd-Fe-B thin films acquired this built were compared to data taken using commercial superconducting qua...

Abstract This paper describes and discusses the preprocessing calibration of magnetic data taken by navigational magnetometers onboard two GRACE satellites, with focus on almost 10 years period from January 2008 to end mission in October 2017 for which 1-Hz are available. A is performed comparing raw magnetometer sensor readings model vector values as provided CHAOS-7 geomagnetic field time pos...

Over the past decade, notable progress has been made in the performance of airborne geophysical systems for mapping and detection of unexploded ordnance in terrestrial and shallow marine environments. For magnetometer systems, the most significant improvements include development of denser magnetometer arrays and vertical gradiometer configurations. In prototype analyses and recent Environmenta...

Self-calibrating an array of 3-D field sensors, such as three-axis magnetometers and accelerometers, requires estimation two variable sets—each sensor’s intrinsic model that maps its input to the corresponding measurement each coordinates relative a common frame reference within array. In this work, we propose first unified self-calibration method for arrays same-type which is robust anomalous ...

We describe a room-temperature alkali-metal atomic magnetometer for detection of small, high frequency magnetic fields. The magnetometer operates by detecting optical rotation due to the precession of an aligned ground state in the presence of a small oscillating magnetic field. The resonance frequency of the magnetometer can be adjusted to any desired value by tuning the bias magnetic field. W...

Abstract. The Low Orbit Pearl Satellite series consists of six constellations, with each constellation consisting three identical microsatellites that line up just like a string pearls. first satellites were launched on 29 September 2017, an inclination ? 35.5? and 600 km altitude. Each satellite is equipped fluxgate magnetometers measure the in situ magnetic field its low-frequency fluctuation...