Advises on a position sensor detached for the mover

[Yaroooo]

Hi all,

I'm looking for a good solution to a problem. I've a moving mechanical part, without cables or anything, that performs a linear motion. I'd like to know position of this mechanical part, without adding anything mechanical to actual system (i.e. rotative encoder or encoder on moving part). What I can do is to add something nearby it.

I've excluded things like ToF or vision systems and perform some research. I've found some systems that use, on linear motion, magnetic encoders with sensor on stator and a ferromagnetic material on mover. What I'm aware is that system doesn't use single sensors due very high accuracy.

Do someone have idea on what kind of system they use?

I'd like a start point where looking for on my researches.

[soldar]

I'd like to know position of this mechanical part,

What kind of precision? How many bits?
What is the total travel distance?

[Yaroooo]

System that I saw is iTRACK from rockwel that provide a precision of +/-0.5mm. This system use a magnet on it's carriage.

I'd like a +/-1mm precision within 1.5/2meters. It will be too expensive to place a sensor each 1mm. I suppose they use something like a hall sensor with a range of some mm and than interpolate reading of two or more sensor to get absolute position?

I'd like something similar to my system; I can put a magnet on it, but what I'll need to use to know the position of my part? Is there something common and used commercially?

[senso]

Use a laser range finder, point at part, done..

If its an industrial application, grab a distance sensor from banner with IOLink and go to town, any laser sensor from Contrinex that talks IOLink, so you can read back the actual position and not just some on/off setpoint cut-off.