Savukov I M, Seltzer S J, Romalis M V, Sauer K L
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2005 Aug 5;95(6):063004. doi: 10.1103/PhysRevLett.95.063004. Epub 2005 Aug 3.
We describe an alkali-metal magnetometer for detection of weak magnetic fields in the radio-frequency (rf) range. High sensitivity is achieved by tuning the Zeeman resonance of alkali atoms to the rf frequency and partially suppressing spin-exchange collisions in the alkali-metal vapor. We demonstrate magnetic field sensitivity of 2 fT/Hz(1/2) at a frequency of 99 kHz with a resonance width of 400 Hz. We also derive a simple analytic expression for the fundamental limit on the sensitivity of the rf magnetometer and show that a sensitivity of about 0.01 fT/Hz(1/2) can be achieved in a practical system with a measurement volume of 200 cm3.
我们描述了一种用于检测射频（rf）范围内弱磁场的碱金属磁力计。通过将碱金属原子的塞曼共振调谐到射频频率并部分抑制碱金属蒸汽中的自旋交换碰撞，可实现高灵敏度。我们展示了在99 kHz频率下，共振宽度为400 Hz时，磁场灵敏度为2 fT/Hz(1/2)。我们还推导了射频磁力计灵敏度基本极限的简单解析表达式，并表明在测量体积为200 cm3的实际系统中可实现约0.01 fT/Hz(1/2)的灵敏度。
