On Mon, 07 Nov 2005 13:51:46 +0100, Eric Meurville
wrote:
Jerry Avins wrote:
Eric Meurville wrote:
We are seeking a solution to monitor contactlessly (up to 10-15mm or
more if possible) the position of a small cylindrical rotor (diameter
1.6 mm, length 2 to 4mm) diametrically magnetized spinning up to 300
Hz. The solution must not be too sensitive to misalignment of rotor
and sensor (e.g. up to +/-45°).
All propositions and comments are welcome.

Questions:
- The position measurement is relative to what?
Displacement between the cylinder and it's container?

- Which axis do you want to measure displacement along,
the axis of rotation or either of the 2-axis at 90 deg to axis of
rotation? Or some angular displacement from the rotation axis
(i.e. precession).

- Is the container transparent (i.e. could you use a light pipe
combined with a light source and light sensor)?

- can you post a diagram online?