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Talking about a wire potentiometer, I was wondering about the way it could be used after installation. as you know, wire sensors have a roll of wire inside them that come out of a hole, and it sounds like that the wire should always remain direct and in the same orientation as it comes out.

for example in this link

you can see that the wire is always held along one axis , let's say X axis to verify the length of the wire:

enter image description here

if my interest is the length change ( not the absolute current value) of the wire, and the wire does move not only in X direction, but let's say also in Y (and or) Z direction , while my interest is in $\delta L$ of the wire, not only in one certain axis, how much error would we introduce to the measurement ? is there a way to approximate that ?

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  • $\begingroup$ Could you please clarify if you are interested only in the X-component of the length change ($\delta L_X$), or are you interested in the total length change ($\delta L$)? $\endgroup$
    – NMech
    Commented Sep 30, 2020 at 8:22
  • $\begingroup$ I edited the question : my interest is in deltaL of the wire, not only in one certain axis $\endgroup$
    – FabioSpaghetti
    Commented Sep 30, 2020 at 8:24
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    $\begingroup$ Then - as far as I can see- I think your error in measuring $\delta L$ should be zero. I mean apart from friction, that might hinder the movement a bit, I don't think that you should get any error. $\endgroup$
    – NMech
    Commented Sep 30, 2020 at 8:27

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As far as I can see- I think your error in measuring $\delta L$ should be zero.

I mean apart from the increased friction, that might hinder the movement a bit, I don't think that you should get any error in the measurement of length.

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  • $\begingroup$ did you down vote my question? $\endgroup$
    – FabioSpaghetti
    Commented Oct 17, 2020 at 9:03
  • $\begingroup$ no I didn't. some one else did. $\endgroup$
    – NMech
    Commented Oct 17, 2020 at 9:04
  • $\begingroup$ if you believe it was a good question , could you assign your vote please? $\endgroup$
    – FabioSpaghetti
    Commented Oct 18, 2020 at 7:04
  • $\begingroup$ I would appreciate that $\endgroup$
    – FabioSpaghetti
    Commented Oct 20, 2020 at 6:29

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