We propose a precise method to calibrate the coil constants of spin-precession gyroscopes and optical atomic magnetometers. This is based on measuring initial amplitude Free Induction Decay (FID) noble gases, from which π/2 pulse duration can be calculated, since it inversely proportional pulse. Therefore, calibrated by duration. Compared with Larmor precession frequency atoms, our avoid effect pump probe powers. experimentally validated in Nuclear Magnetic Resonance Gyroscope (NMRG),...

We propose an average Rb polarization model to analyze the influence of temperature on spin and 129Xe in a Nuclear Magnetic Resonance Gyroscope (NMRG) with low pump power. This is essentially based summing along direction beam dividing result by cell length. experimentally study atoms as function at values The experimental results calculated are good agreement for both 129Xe. decreases increasing temperature, decreasing trend which rapid temperatures below 110 °C, slower above °C....

We propose a method for the precise determination of nuclear spin polarization, based on atomic magnetometers, which employs effective magnetic field produced by polarization 129Xe nuclei. This can be estimated measuring initial induced voltage Free Induction Decay (FID) signal nuclei, is calibration coefficient between transverse and output magnetometer, using an off-resonant driven field. Compared with longitudinal relaxation time nuclei alkali-metal atoms, our directly measure without...

The laser intensity stability counts for the performance of Nuclear Magnetic Resonance Gyroscope (NMRG). We switch to attenuate fluctuation with aid an opto-electric modulator and feedback control. Liquid Crystal Variable Retarder (LCVR) has a sharp edge over its counterparts such as AOM EOM benefiting from compact size, low operation voltage large clear aperture. In this paper, we demonstrate LCVR based stabilization system designed NMRG prototype. setup mainly compromises two crossed...

In this Letter, the liquid crystal variable phase retarder is applied for accurate modulation of laser power in a detection system and construction that suppresses influence noise on gyro’s bias instability. A closed-loop control method suppression proposed. We obtain stability index 0.038% 3-h continuous test, nuclear magnetic resonance gyroscope instability reaches 1°/h. The proposed effectively improves signal-to-noise ratio signal, which lays technical foundation future research work.

Nuclear magnetic resonance gyroscope (NMRG) is the smallest atomic sensor in navigation level. Spin precession can be detected by measuring optical rotation of plane an off-resonant linearly polarized probe beam. The optimal frequency and power beam counts for performance NMRG, which has been verified our former experiments. NMRG system would have higher sensitivity lower consumption comparing to circularly In this paper, we demonstrate theoretical analysis experimental verification. theory,...

Nuclear magnetic resonance (NMR) oscillator is an optical atomic sensor which developed to measure inertial angular velocity with navigation grade accuracy. It utilizes semiconductor laser, miniaturized shield and atom vapor cell realize nuclear resonance, pump detection in a very small volume (about 10cc 100cc). NMR much more compact than other classic gyros such as fiber optic gyro (FOG), so it potential substitution of FOG the next generation IMU. To achieve this goal, essential analyse...

In recent years, the distributed Bragg reflector (DBR) laser diode (LD) has advantages of its small size, high efficiency, low power consumption and so on, it been widely used in precision measurement, optical information processing, quantum research other fields. There is a strict requirement for output frequency DBR measurement technology. Therefore, controlling accurately great significance measurement. Currently, there are lot control scheme diode, mainly through external system to...

Axis orientation stability has a great effect on the long-term drift performance of nuclear spin comagnetometers that utilize alkali atoms to detect magnetic moment ensembles. Previous studies have analyzed sensitivity influence misalignment angle and demonstrated post-processing calibration method in transverse polarized comagnetometer, but there is no study traditional longitudinally setup. We propose an innovative biaxial differential detection monitor comagnetometer then eliminate it...

We present a design for spin-exchange optical pumping system to produce large quantities of highly polarized ¹²⁹Xe and ¹³¹Xe. Low xenon concentrations in the flowing gas mixture which allow laser maintain high Cs polarization. The rate between Xe through long-lived van der Waals molecules at low pressure, combined with flow rate, results production rates hyperpolarized xenon. fast make it possible obtain nuclear polarizations after several minutes laser.At pressures....

Measuring the transverse relaxation time of noble gas nuclei with Free-induction-decay (FID) signal is one key technical challenges and prerequisites for nuclear magnetic resonance gyroscope (NMRG), which a quantum sensor to form an inertial navigation system. In this paper, novel method estimate parameter freeinduction-decay based on adaptive internal model (AIM) controller proposed it verified by free induction decay data collected from gyro prototype. methods, AIM con troller can provide...

The transverse relaxation time of the spin-exchange optical pumped noble gas nuclei is a fundamental parameter to evaluate performance nuclear magnetic resonance (NMR) rotation sensor. In practical tests and applications, measuring in real-time challenging. Due conflict with feedback loops, traditional methods are unsuitable for measurement. To address this limitation, paper proposes method based on identification measure time. proposed method, step signal added oscillation field excite...