Does the resistance of strain gauge increase when temperature increases?

[fiona_loveroy]

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

 

[Crazy Tosser]

Resistance increases if wood expands

Explanation on 2nd page of

http://en.wikipedia.org/wiki/Strain_gauge

 

[fiona_loveroy]

thank you so much!

 

[Crazy Tosser]

thank you so much!

You are welcome =) Google power is backing me up =P

 

[FredGarvin]

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.