Tuesday, 26 March 2019

resistors - How does temperature compensation work for strain gauge in wheatstone bridge


Wheatstone bridge is used for temperature compensation for strain gauges


enter image description here


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???




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