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Question:

Material wherein electrical resistance changes in a magnetic field?

I need to presence sense a row of several magnets (6-20, depending on the machine size) that are repeatedly placed onto and collected from a steel surface. I need to determine a signature of the magnetic field of the group, then check each time they are placed/collected to ensure that none are missing. Thought is to run a strip of the desired material close alongside the row, and check the resistance (signature) with an ohmmeter.I‘d also be interested in any other ideas to accomplish this.Thanks in advance!

Answer:

The easiest way may be to use a spectrum analyzer with a magnetic field probe. This will accomplish what you are trying to do as you have described. As far as I know, there isn't a simpler way to do it with an ohmmeter as you want to do.

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