Author Topic: picoOhm variation sensor  (Read 279 times)

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Offline raphchev

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  • Country: fr
picoOhm variation sensor
« on: August 19, 2021, 02:21:39 pm »

I am investigating a technique to detect breakage of a copper wire in parallel with a stainless wire.
The idea was to measure resistance change; but the sensitivity required is around 2-10pΩ; that seems practically impossible, even with a four wire & a total resistance around 0.1Ω.

But I was thinking, since the wire breakage is likely to be quick (hypothesis; switching from ON to OFF takes about 1ns),  have you ever encountered a circuit that could sense that quick change in resistance? Maybe a four wire coupled with a capacitor to get rid of DC and let the change through?



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