Does the resistance of strain gauge increase when temperature increases?

In summary, the conversation discusses using a strain gauge to measure the expansion and contraction of wood due to changes in humidity and temperature. The question is whether the resistance of the strain gauge will increase or decrease if the temperature increases, and the reason for this. The response is that the resistance will increase as the wood expands, and this is due to differences in expansion between the gauge and the wood substrate.
  • #1
fiona_loveroy
2
0
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
 
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  • #3
thank you so much!
 
  • #4
fiona_loveroy said:
thank you so much!

You are welcome =) Google power is backing me up =P
 
  • #5
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.
 

1. How does temperature affect the resistance of a strain gauge?

Temperature can affect the resistance of a strain gauge in two ways. Firstly, the material of the strain gauge may expand or contract with changes in temperature, causing a change in resistance. Secondly, changes in temperature can also affect the electrical conductivity of the material, which can impact the resistance of the strain gauge.

2. Does the resistance of a strain gauge always increase with temperature?

No, the resistance of a strain gauge may not always increase with temperature. It depends on the material of the strain gauge and the magnitude of the temperature change. In some cases, the material may have a negative temperature coefficient, meaning that its resistance decreases with an increase in temperature.

3. How significant is the effect of temperature on the resistance of a strain gauge?

The significance of temperature on the resistance of a strain gauge depends on several factors such as the material of the strain gauge, the magnitude of temperature change, and the application environment. In some cases, the effect may be negligible, while in others, it may be significant and need to be accounted for in measurements.

4. Can the resistance of a strain gauge be compensated for temperature changes?

Yes, the resistance of a strain gauge can be compensated for temperature changes by using temperature compensation techniques such as using a temperature sensor to measure the temperature and adjusting the strain gauge readings accordingly. This helps to minimize the impact of temperature on the accuracy of measurements.

5. Is there a standard formula to calculate the change in resistance of a strain gauge with temperature?

No, there is no standard formula to calculate the change in resistance of a strain gauge with temperature as it depends on various factors such as the material, design, and application of the strain gauge. However, manufacturers may provide a temperature coefficient of resistance (TCR) value that can be used as a reference for estimating the change in resistance with temperature.

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