Leonardo Marsaglia wrote:
> Hello Andy.
>
> That's really good news, if one can use a DIY LVDT that would reduce the
> cost drastically.
>
> I've only seen low travel LVDTs intended to be used in diameter measuring
> and things like that. Do you think a 1000 mm LVDT is possible to accomplish
> without great issues?.
>   
Huh?  one METER long LVDT?  Sure, you could build such a device, but the 
resolution
would be a bit better than a mm assuming the magnetics were perfect.  
Why would you
try to do this?  generally, you can expect to get one part per thousand 
easily in analog
electronics, 1 part in 10,000 with substantial difficulty, and anything 
beyond that is
getting into the area of insanity.  Linear scales of a variety of 
techniques are available
for modest sums, with resolution inversely proportional to price.  With 
these, vastly
greater resolution is much more easily obtained, and linearity is 
assured by the
manufacturing process.

Jon

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