- #1
mercury303
- 7
- 1
I'm trying to design a position sensor for a specific application but the last time I thought about physics was a long time ago.
The situation is *similar* to this :
I have a block of wood with an irregularly shaped tantalum bead (diameter of about 2mm) embedded about 2-4 mm into the wood. There is a 1cm thick gel-foam pad lying over the block of wood with a point marked approximately over where the tantalum bead is.
The block of wood moves in jerky movements and the gel-foam wobbles over it.
I want to determine how much the marked point moves in relation to the tantalum bead and in what direction. What would be the best way to do that?
Things I've considered are :
- placing an wire coils on the foam, centered over the marked point to create a metal detector-type device (but probably with 2 or 3 receiver coils so that direction can be determined)
- hall effect sensor (but I think I'd need to use a wire coil to magnetise the tantalum)
- eddy current probe
- capacitive sensor
The problem with the last three, I *think* is that they only detect movement toward and away from the sensor and not sideways displacement, which is the important displacement in this scenario.
Any suggestions would be appreciated. Thanks
The situation is *similar* to this :
I have a block of wood with an irregularly shaped tantalum bead (diameter of about 2mm) embedded about 2-4 mm into the wood. There is a 1cm thick gel-foam pad lying over the block of wood with a point marked approximately over where the tantalum bead is.
The block of wood moves in jerky movements and the gel-foam wobbles over it.
I want to determine how much the marked point moves in relation to the tantalum bead and in what direction. What would be the best way to do that?
Things I've considered are :
- placing an wire coils on the foam, centered over the marked point to create a metal detector-type device (but probably with 2 or 3 receiver coils so that direction can be determined)
- hall effect sensor (but I think I'd need to use a wire coil to magnetise the tantalum)
- eddy current probe
- capacitive sensor
The problem with the last three, I *think* is that they only detect movement toward and away from the sensor and not sideways displacement, which is the important displacement in this scenario.
Any suggestions would be appreciated. Thanks