Research of a high-precision Overhauser magnetometer based on the strongly polarize nuclear spins effect
The Overhauser magnetometer is an essential instrument in magnetic exploration technology,widely used for high-precision scalar magnetic field data acquisition in Earth science research and national defense.Traditional Overhauser magnetometers face limitations due to the relatively weak electron spin energy in the dynamic nuclear polarization effect,which results in low energy absorption by the proton system,inferior Free Induction Decay(FID)signal output,and consequently,lower accuracy in measuring the total geomagnetic field.In this paper,we propose a novel design for the Overhauser magnetometer by introducing the Strongly Polarize Nuclear Spins(SPNS)effect.The novel design exploits the magnetization of free electrons by the heavy nuclear magnetic field,enhancing the energy of free electrons and thereby improving the magnetization intensity of the proton system to enhance measurement accuracy.First,we discuss the theoretical framework of the SPNS Overhauser effect suitable for geomagnetic measurements and its free radical structure.Subsequently,focusing on the excitation of the SPNS effect and the measurement of FID signals,we detail the design of the sensor excitation structure,signal extraction,and frequency measurement scheme for the novel Overhauser magnetometer.Finally,we experimentally analyzes the parameters of the SPNS effect,comparing the performance of the novel Overhauser magnetometer with traditional and commercially available magnetometers.The results indicate that the SPNS effect effectively improves the amplitude of the FID signal,achieving an approximately 2.8-fold increase in signal amplitude compared to traditional Overhauser magnetometers.The actual measurement accuracy of the novel Overhauser magnetometer can reach 0.048 nT,comparable to internationally leading commercial Overhauser magnetometers.
Geomagnetic field measurementOverhauser magnetometerStrongly polarize nuclear spins effectFID signalMagnetic sensor
万方数据
维普
