How does the FW magnetometer measure magnetic field?
The FW magnetometer consists of five dedicated devices: a high magnetic field polarizer, a flowing water type probe, a synthesized frequency source (50 Hz 100 MHz with resolution 0.01Hz), a proton magnetic polarization analyzer, and a water pump system. First, flowing water is pumped into the polarizer in order to obtain a certain level of proton longitudinal polarization. Next, the water flows through the probe located at the magnetic field being measured. The coil in the probe is connected to the synthesized frequency source through the probe cable. If the system scan frequency (w / 2p ) and the magnetic field being measured (H0) meet following condition: w = g p H0 Where g p is the proton gyromagnetic ratio in water, the longitudinal polarization of flowing water will be altered by the interaction of the proton moment with oscillating fields in the probe coil. Finally, the water flows back to the magnetic polarization analyzer. The analyzer will detect an electronic signal with a ce
