How does water affect an inductive loop? - Electronic Circuits Projects Diagrams Free

Dixie68 · 3rd November 2009, 03:32 PM

An inductive loop, (well insulated so shorts are not a problem), lies submerged in a pool of water. Apart from problems caused by possible insulation degradation over time, would the pool of water affect any signals sent along the loop - i.e. 'slugging'/attenuation of the signal?

Many thanks

crutschow · 3rd November 2009, 04:23 PM

It depends upon the relative magnetic permeability of water as compared to air. Since the relative magnetic permeability of air is 1.000,000,37 and water is 0.999992 (a vacuum is 1), the effect of water on the inductive loop will be unmeasureable in most practical applications.

Mr RB · 3rd November 2009, 07:23 PM

Unless the water is conductive.... Like water in the ground might be.

gabeNC · 3rd November 2009, 07:32 PM

According to the OP, the inductor is insulated so that wouldn't be a problem. Question is, why would you want to do that? Heat dissipation? Just put it in a non-conductive bath of oil like a large transformer.

HiTech · 3rd November 2009, 09:55 PM

Mineralized water will affect coil inductance --- it's a crucial issue when it comes to using metal detectors, above ground or under water. Mineralized water affecting the signal depends on signal frequency and emission type.

Dixie68 · 4th November 2009, 08:34 AM

It's not a case of wanting to do it, the loop is part of a rail communications system and the part of the track where it is located floods every now and then.
Aerials on the train pick up signals from the loop inductively.

Dixie68 · 4th November 2009, 08:41 AM

... and the frequency of the signal should be no larger than 80khz

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3rd November 2009, 03:32 PM	#1
Dixie68	How does water affect an inductive loop? An inductive loop, (well insulated so shorts are not a problem), lies submerged in a pool of water. Apart from problems caused by possible insulation degradation over time, would the pool of water affect any signals sent along the loop - i.e. 'slugging'/attenuation of the signal? Many thanks

3rd November 2009, 04:23 PM	#2
crutschow	It depends upon the relative magnetic permeability of water as compared to air. Since the relative magnetic permeability of air is 1.000,000,37 and water is 0.999992 (a vacuum is 1), the effect of water on the inductive loop will be unmeasureable in most practical applications. __________________ Carl Curmudgeon Elektroniker

3rd November 2009, 07:23 PM	#3
Mr RB	Unless the water is conductive.... Like water in the ground might be.

3rd November 2009, 07:32 PM	#4
gabeNC	According to the OP, the inductor is insulated so that wouldn't be a problem. Question is, why would you want to do that? Heat dissipation? Just put it in a non-conductive bath of oil like a large transformer.

3rd November 2009, 09:55 PM	#5
HiTech	Mineralized water will affect coil inductance --- it's a crucial issue when it comes to using metal detectors, above ground or under water. Mineralized water affecting the signal depends on signal frequency and emission type. __________________ Don't make me reach through this monitor to slap you a good one!

4th November 2009, 08:34 AM	#6
Dixie68	It's not a case of wanting to do it, the loop is part of a rail communications system and the part of the track where it is located floods every now and then. Aerials on the train pick up signals from the loop inductively.

4th November 2009, 08:41 AM	#7
Dixie68	... and the frequency of the signal should be no larger than 80khz Last edited by Dixie68; 4th November 2009 at 08:41 AM.