Geoff.

Looks reasonable to me.

Based on your photo, see http://bnordgren.org/seismo/magnet1.pdf

The voltage in the coil depends on how many wires cut how many 
magnetic lines how fast.

With the magnets arranged as shown, the magnetic lines go from left 
to right in the top gap and right to left in the bottom gap.  And, if 
the coil wires are going away from you in the top part of the coil, 
they will be coming towards you in the bottom part.

All that means is that as you move the coil up or down, the voltage 
generated in the wires of the top half of the coil as they cut 
magnetic lines, will add to the voltage generated in the wires of the 
bottom half, adding up to give the output voltage proportional to 
coil velocity you were looking for.

Brett



At 10:22 AM 7/17/2010, you wrote:

>Hello PSN folks,
>
>Below Is A Velocity Sensor i had sitting
>in the corner for the past few years
>which has collected a lot of dust.
>
>"Please Excuse the Years of dust and, possibly, life forms present"
>
>I believe it to be a proper design
>for motion along the plane of the faces
>of the two magnets.
>
>The poles are N=>S TOP
>                     S=>N Bottom
>
>I intend the coil to move vertically in this picture.
>
>http://gmvoeth.home.mchsi.com/100_0516.jpg
>
>Do any of you know for sure if this is
>or is not the correct use of magnet and coil
>as a sensor ?
>
>Please explain your response so I "MIGHT" understand.
>
>Best regards,
>geoff
>
>
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