Wheatstone bridge is used for temperature compensation for strain gauges
If 2 strain gauges are connected like this figure. Due to temperature variation; the resistance Rg will change in the same way.
Lets say; the bridge is balanced at start. R1/R2 = (RG+DeltaR)/(RG-DeltaR)
If strain gauge resistance increases due to temperature: R1/R2 = (RG+DeltaR+RT)/(RG-DeltaR+RT)
How does this compensation work?
(RG+DeltaR+RT)/(RG-DeltaR+RT) is not the same as (RG+DeltaR)/(RG-DeltaR)
So gets the bridge unbalanced???