Pulsed Helium Magnetometer.
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention relates to a low power helium magnetometer and more particularly to a pulsed helium magnetometer which will record a sample per second of diurnal and other variations of the earths total magnetic field and will detect a change in the value of this field. In the field of magnetometers, one method of measuring magnetic fields has been to continuously excite cells of rubidium vapor mercury, or helium, by a UHF oscillator and to continuously detect and record variations in the output signal of the cell representative of changes in the surrounding magnetic field. These continuously excited magnetometers required for their operation a considerable amount of power and human effort, and their dynamic range was controlled by a number of fixed crystals. Vapor magnetometers, when operated. In the continuous mode, are limited to applications where a considerable amount of electric power is readily available, and since manual assistance is involved in their operation, this will automatically disqualify them for long-term unattended operation. In addition, the dynamic range of these magnetometers is limited to applications where background magnetic fields are known in advance.
- Test Facilities, Equipment and Methods