Electromagnetic Field Measurement

D

Dave Goldfinch

Guest
There is enough material on the net to suggest that Pulsed
Electromagnetic Therapy MAY just work to relieve arthritic pain.

I am not convinced enough to spend US$1200 or so for a commercially
produced machine, but I believe it should be reasonably easy to build
one. I am thinking a PICAXE driving a FET switching a 12V supply
through a coil of around 45cm diameter.

The problem is how to calculate the number of turns and the current
required through the coil to produce the required field strength ?

The strengths I have seen quoted are: 2.74 x 10(-7) to 3.4 x 10(-8) G.
I presume the 'G' is for Gauss. I have also seen a figure of 25 Tesla.

I would also like to measure the produced field if at all possible,
just to confirm that it is in the ballpark.

I will be grateful for any help with this.

TIA

Dave Goldfinch
 
Dave Goldfinch <daveg50_8@NotCoolMail.invalid> wrote in
news:588ci1dbjd8gqgr5mb1rjbkp08d1iakije@4ax.com:

There is enough material on the net to suggest that Pulsed
Electromagnetic Therapy MAY just work to relieve arthritic pain.

I am not convinced enough to spend US$1200 or so for a commercially
produced machine, but I believe it should be reasonably easy to build
one. I am thinking a PICAXE driving a FET switching a 12V supply
through a coil of around 45cm diameter.

The problem is how to calculate the number of turns and the current
required through the coil to produce the required field strength ?

The strengths I have seen quoted are: 2.74 x 10(-7) to 3.4 x 10(-8) G.
I presume the 'G' is for Gauss. I have also seen a figure of 25 Tesla.

I would also like to measure the produced field if at all possible,
just to confirm that it is in the ballpark.

I will be grateful for any help with this.

TIA

Dave Goldfinch
Click to expand...
Check this site for online calcs.
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html

These field strengths you quoted are tiny, will have close to no effect.
Earths weak filed is ~0.5 G. 10000 G= 1 Tesla. I bet most of the stuff
you looked up were scammers, not scientific.
 
On Tue, 13 Sep 2005 02:36:34 GMT, Geoff C <notinterestedin@spam.com>
wrote:

Dave Goldfinch <daveg50_8@NotCoolMail.invalid> wrote in
news:588ci1dbjd8gqgr5mb1rjbkp08d1iakije@4ax.com:


There is enough material on the net to suggest that Pulsed
Electromagnetic Therapy MAY just work to relieve arthritic pain.

I am not convinced enough to spend US$1200 or so for a commercially
produced machine, but I believe it should be reasonably easy to build
one. I am thinking a PICAXE driving a FET switching a 12V supply
through a coil of around 45cm diameter.

The problem is how to calculate the number of turns and the current
required through the coil to produce the required field strength ?

The strengths I have seen quoted are: 2.74 x 10(-7) to 3.4 x 10(-8) G.
I presume the 'G' is for Gauss. I have also seen a figure of 25 Tesla.

I would also like to measure the produced field if at all possible,
just to confirm that it is in the ballpark.

I will be grateful for any help with this.

TIA

Dave Goldfinch


Check this site for online calcs.
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html

These field strengths you quoted are tiny, will have close to no effect.
Earths weak filed is ~0.5 G. 10000 G= 1 Tesla. I bet most of the stuff
you looked up were scammers, not scientific.
Click to expand...
Geoff

Thanks for the link.

As you say, most of the stuff I read was snake -oil, but there were a
few papers that described double blind tests that appeared genuine.

As long as it only costs my time + a few dollars for components I am
happy to experiment - using myself as a guinea pig of course !

Dave
 
Dave Goldfinch <daveg50_8@NotCoolMail.invalid> wrote in
news:8vrci19nsmequ6qamus505pf54bo48jh82@4ax.com:

On Tue, 13 Sep 2005 02:36:34 GMT, Geoff C <notinterestedin@spam.com
wrote:

Dave Goldfinch <daveg50_8@NotCoolMail.invalid> wrote in
news:588ci1dbjd8gqgr5mb1rjbkp08d1iakije@4ax.com:


There is enough material on the net to suggest that Pulsed
Electromagnetic Therapy MAY just work to relieve arthritic pain.

I am not convinced enough to spend US$1200 or so for a commercially
produced machine, but I believe it should be reasonably easy to build
one. I am thinking a PICAXE driving a FET switching a 12V supply
through a coil of around 45cm diameter.

The problem is how to calculate the number of turns and the current
required through the coil to produce the required field strength ?

The strengths I have seen quoted are: 2.74 x 10(-7) to 3.4 x 10(-8)
G.
I presume the 'G' is for Gauss. I have also seen a figure of 25
Tesla.

I would also like to measure the produced field if at all possible,
just to confirm that it is in the ballpark.

I will be grateful for any help with this.

TIA

Dave Goldfinch


Check this site for online calcs.
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html

These field strengths you quoted are tiny, will have close to no
effect.
Earths weak filed is ~0.5 G. 10000 G= 1 Tesla. I bet most of the stuff
you looked up were scammers, not scientific.

Geoff

Thanks for the link.

As you say, most of the stuff I read was snake -oil, but there were a
few papers that described double blind tests that appeared genuine.

As long as it only costs my time + a few dollars for components I am
happy to experiment - using myself as a guinea pig of course !

Dave
Click to expand...
Dave

Tell us if it has any noticeable effect!
 
Geoff C wrote:
Tell us if it has any noticeable effect!
Click to expand...
It likely operates by a well researched principle called the placebo effect.

Cheers,
Nicholas Sherlock
 
On Tue, 13 Sep 2005 20:43:45 +1200, Nicholas Sherlock
<n_sherlock@hotmail.com> wrote:

Geoff C wrote:
Tell us if it has any noticeable effect!

It likely operates by a well researched principle called the placebo effect.

Cheers,
Nicholas Sherlock
Click to expand...

Yes, well it will be difficult for me to conduct a true double blind
trial on myself BUT I am almost as sceptical as you appear to be, so
we can but wait and see.

Hell ! even if it is only placebo I will be happy if it has SOME
effect !

Dave
 
Dave Goldfinch wrote:
Yes, well it will be difficult for me to conduct a true double blind
trial on myself BUT I am almost as sceptical as you appear to be, so
we can but wait and see.

Hell ! even if it is only placebo I will be happy if it has SOME
effect !

Dave
Click to expand...


Hi Dave, I reckon pulses at 2.45 GHz will work a treat on arthritis.

;)

Regards
Mark
 
frequency is not mentioned, or is the 200Hz pulses of 900MHz EMF from a mobile going to work

do mobile phone users have less joint problems than the rest?
 
On Tue, 13 Sep 2005 20:54:05 +1000, Mark Harriss <billy@blartco.co.uk>
wrote:

Dave Goldfinch wrote:


Yes, well it will be difficult for me to conduct a true double blind
trial on myself BUT I am almost as sceptical as you appear to be, so
we can but wait and see.

Hell ! even if it is only placebo I will be happy if it has SOME
effect !

Dave



Hi Dave, I reckon pulses at 2.45 GHz will work a treat on arthritis.

;)

Regards
Mark
Click to expand...
Yeah, presumably at about 2KW !! Do you prefer your knees rare or well
done ?

Just for the record, the frequencies mentioned in the trials are
generally below 10Hz.

Dave
 
a pulse has very high freqs, you are only talking about the prf
 
On Tue, 13 Sep 2005 21:10:00 +0800, Ed /:-}
<fred.ferd@tell_someone_who_cares.gov.au> put finger to keyboard and
composed:

frequency is not mentioned, or is the 200Hz pulses of 900MHz EMF from a mobile going to work

do mobile phone users have less joint problems than the rest?
Click to expand...
No, if anything they appear to have *more* problems. In fact I notice
that many of them no longer have the dexterity to operate the Shift
key.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.
 
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