Electromagnetic Distance measurements
Electromagnetic Distance measurements
(OP)
I am currently designing an electromagnetic tether robot. The robot needs to stay a constant distance from an electromagnetic beacon. I am having difficulty coming up with a way to determine distance using magnetic field. I assume you run an alternating current through a solenoid to generate an elecromagnetic wave but I cant figure out how to determine the distance on the recieving end. I considered using a hall effect sensor and just producing a magnetic field but I dont think this will work for the range I need.
Any suggestions on how to approach this problem would be awesome thanks!
Any suggestions on how to approach this problem would be awesome thanks!





RE: Electromagnetic Distance measurements
Why magnetic? Is that the new trend?
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Electromagnetic Distance measurements
You could use "time of flight" light.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Electromagnetic Distance measurements
TTFN

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RE: Electromagnetic Distance measurements
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(2B)+(2B)' ?
RE: Electromagnetic Distance measurements
None of these threads has led to any breakthroughs in the subject of short range indoor (not D-GPS) navigation.
Because the solenoid will not be an isotopic radiator, any field strength measurement technique would require restrictions on relative orientation.
Time of flight techniques (time domain) are difficult over short distances. And would need ultra short pulse, not kHz.
I've sometimes wondered if a conceptual two-part oscillator (with the range gap in middle of the oscillator) might lead to a very sensitive ranging solution (since frequency is so trivial to measure almost anywhere in the spectrum).
Ultrasonics of course. There are Arduino modules and sample code.
The modern solution is to simply use a vision system; these days that's an MS Xbox Kinect ($100) and some reference software from the net. The EM beacon could have a blinking LED - emitting "EM" waves in the visible spectrum.
RE: Electromagnetic Distance measurements
RE: Electromagnetic Distance measurements
TTFN

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RE: Electromagnetic Distance measurements
RE: Electromagnetic Distance measurements
It's a serious challenge. If someone solves it inexpensively, several derivative products become possible, and profitable.
Mike Halloran
Pembroke Pines, FL, USA
RE: Electromagnetic Distance measurements
I don't think anyone knows how to do that.
Keep in mind that a 10kHz signal (for example) has a wavelength of 30 km. And no, you can't on-off key a kHz carrier at nanosecond rates.
RE: Electromagnetic Distance measurements
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RE: Electromagnetic Distance measurements