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Hi everyone.
I've recently been corresponding with a fellow in France who is
interested in making a large toroidal sensor. We've been kicking
ideas around and ha made some suggestions which got me thinking of
another somewhat toroidal shape for a proton sensor which might even
be better than a simple toroid. It is the shape shown in the
attached file. It has all the advantages of the toroid - good noise
rejection, insensitivity to orientation with respect to the magnetic
field. However, it is also easy to make .... AND, it gives a higher
S/N!
You could make a core like this by using two different diameters
of plastic tubing. Glue end plates on the two concentric sections
of tubing (and cut out the centres of each end, of course) and you
have it. I'm quite excited about this because I have done the
theory for this shape and it looks like you can get very high S/N -
much higher than for a simple toroid (one with circular
cross-section) of the same radius. That is because S/N depends on
the volume of the fluid and it will obviously be much higher for
this shape than for a similarly sized toroid with circular
cross-section.
I am revising my spreadsheet to incorporate this shape and
expect to have this done in a week or so. I'm on my way down to
Arizona for the winter next week and will probably not get the
revised version onto my Web site before I get there.
Jim
//////////////
Jim Koehler
RR2, Site 292, C56
Courtenay, BC, V9N-5M9
Canada
Email: [email protected]
//////////////
Attachments:
cylinderical toroid.PDF
I've recently been corresponding with a fellow in France who is
interested in making a large toroidal sensor. We've been kicking
ideas around and ha made some suggestions which got me thinking of
another somewhat toroidal shape for a proton sensor which might even
be better than a simple toroid. It is the shape shown in the
attached file. It has all the advantages of the toroid - good noise
rejection, insensitivity to orientation with respect to the magnetic
field. However, it is also easy to make .... AND, it gives a higher
S/N!
You could make a core like this by using two different diameters
of plastic tubing. Glue end plates on the two concentric sections
of tubing (and cut out the centres of each end, of course) and you
have it. I'm quite excited about this because I have done the
theory for this shape and it looks like you can get very high S/N -
much higher than for a simple toroid (one with circular
cross-section) of the same radius. That is because S/N depends on
the volume of the fluid and it will obviously be much higher for
this shape than for a similarly sized toroid with circular
cross-section.
I am revising my spreadsheet to incorporate this shape and
expect to have this done in a week or so. I'm on my way down to
Arizona for the winter next week and will probably not get the
revised version onto my Web site before I get there.
Jim
//////////////
Jim Koehler
RR2, Site 292, C56
Courtenay, BC, V9N-5M9
Canada
Email: [email protected]
//////////////
Attachments:
cylinderical toroid.PDF