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Homework Help: Wheatstone bridge/ strain gauge question

  1. Apr 21, 2008 #1
    Need to do an experiment where I masure the strain of wood due to changes in temperature. I believe I need to use 2 strain gauges, one to measure the strain and the other to act as a dummy to cancel out any affects that heating will have on the strain gauge. I also know that a wheatstone bridge needs to be used to find out the very small changes in resistance. What I don't know is how to link all that together to get some results of strain.

    Does anyone know how I can put my strain gauges into the wheat stone bridge equation to come up with a value of strain? I think it will look something like this:

    4(Vout/vexternal)/Gauge factor = strain

    Is it right?

    Many thanks!
  2. jcsd
  3. Apr 22, 2008 #2
    nobody can help me, it's really important I get this equation right?
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