Francisco Lopez and Elena Khakimova (GEM Systems, Inc., Markham, Ontario)
Overhauser magnetometers take advantage of key phenomena – the ability to use radio frequencies (RF) signals to excite both protons and electrons contained in a mixture of proton-rich solvent and electron-rich free radicals.
When excited, the electrons add their net (higher) energy to that of protons with the result that signal to noise is increased by approximately 5000 times. The result is very high quality results with low power consumption.
When choosing an Overhauser magnetometer for your application, it is important that you identify:
1. What type of unit do I need: Rover or Base?
2. What type of sampling best meets my requirements: Continuous or Discrete?
3. What should I expect in terms of data quality?
4. What sensitivities are appropriate?
5. What are the power requirements and operating characteristics?
6. What GPS options should I consider: Time and Position?
7. What are the conditions for operating the magnetometer / gradiometer?
8. What if I have more questions?