OVERHAUSER磁力仪激发接收系统设计

OVERHAUSER magnetometer excitation and receiving system design

OVERHAUSER磁力仪探头中自由基溶液的激发是OVERHAUSER磁力仪工作的关键。研究了OVERHAUSER磁力仪工作原理和自由基溶液激发原理;研制了一种可控的OVERHAUSER磁力仪探头激发接收系统,系统包含主控系统、可控射频功率信号源和微弱信号放大检波等电路部分。实验结果表明,利用该可控激发系统能够准确的找出自由基溶液的激发频率;且能够得到自由基溶液的极化度与激发功率和激发时间的关系。

Radical solution excitation in OVERHAUSER sensor is the key point in OVERHAUSER magnetometer.The paper researches the OVERHAUSER magnetometer working principle and radical solution excitation principle;introduces a kind of controllable OVERHAUSER magnetometer sensor excitation and receiving system,which includes a main control system,a controllable RF power signal generator and a weak signal amplifier demodulation circuit,and etc.Experiment results demonstrate that using this system the excitation frequency of the radical solution can be found accurately,and the relationship between the polarization degree of the radical solution and excitation power excitation time is also obtained.