Measure 2 magnetic fields operating at different frequencies?

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SUMMARY

This discussion focuses on measuring two alternating magnetic fields generated by coils operating at different frequencies: one at several Hz and the other at several kHz. The participants suggest using a Hall probe placed inside the high-frequency coil to primarily detect the high-frequency magnetic field. Additionally, they highlight that turning off the low-frequency excitation would be the most effective method for isolating the high-frequency signal. Filtering techniques can be applied, but they will still yield a mixed output of both frequencies.

PREREQUISITES
  • Understanding of alternating magnetic fields and their properties
  • Familiarity with Hall effect sensors and their applications
  • Knowledge of signal filtering techniques
  • Basic principles of electromagnetic induction
NEXT STEPS
  • Research Hall probe specifications and their effectiveness in measuring high-frequency magnetic fields
  • Explore signal filtering methods to isolate specific frequency components
  • Study the principles of electromagnetic induction to understand coil interactions
  • Investigate the design and operation of alternating current (AC) magnetic field generators
USEFUL FOR

Engineers, physicists, and researchers involved in electromagnetic field measurements, as well as those developing applications that require precise magnetic field detection and analysis.

ductrungvn
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Hi,

I have 2 coils arranged next to each other. One of them is used to generate alternating magnetic field at several Hz, and the other one also generate alternating magnetic field but at higher frequency (several kHz).

Are there any magnetic sensors that can measure only the high-frequency magnetic field when both of the magnetic fields are being generated OR are there any possible ways to filter (or determine) the high-frequency (kHz) one?

Thank you very much!

Best wishes!
 
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The best way would be to turn off the low frequency excitation. Why can't you do that?

Alternatively, you could get a Hall probe and put it inside the HF coil. The field there should be mostly that of the HF excitation.

Away from the two coils, the magnetic field at anyone point can only have one value and this will vary with the combined effect of the two coils. You can filter the output, but the result would still be that of one frequency mixed with the other.
 

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