Does the resistance of strain gauge increase when temperature increases?

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Discussion Overview

The discussion revolves around the relationship between temperature changes and the resistance of strain gauges, particularly in the context of measuring the expansion and contraction of wood due to humidity and temperature variations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires whether the resistance of a strain gauge increases or decreases with temperature increases that cause wood to expand.
  • Another participant asserts that resistance increases if wood expands, referencing an external source for further explanation.
  • A later reply cautions that matching the strain gauge material to wood may be problematic due to differing expansion rates, which could introduce errors in measurements.

Areas of Agreement / Disagreement

Participants express differing views on the implications of temperature on resistance, and there is no consensus on the relationship between strain gauge resistance and wood expansion.

Contextual Notes

There are unresolved assumptions regarding the specific materials of the strain gauge and wood, as well as the conditions under which the measurements are taken.

fiona_loveroy
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Hello, could someone help on this question??
ok, I'm trying to find out how much a piece of wood expands and contracts with changes in humidity and temperature, I'm sticking a strain gauge on the wood to detect the expansion and contraction of it. my question is if the temperature increase, which makes the wood expand, would the resistance of the strain gauge increase or decrease?? and why??

Thank you
 
Physics news on Phys.org
thank you so much!
 
fiona_loveroy said:
thank you so much!

You are welcome =) Google power is backing me up =P
 
Be careful. You will not be able to match a stain gauge material to wood. There will always be a difference in expansions between the gauge and the substrate that will induce error.
 

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