Draw and explain the temperature compensation circuit in strain-guage.

Draw and explain the temperature compensation circuit in strain-guage. 
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1 Answer

Answer :

Temperature compensation in strain gauge. The resistive type strain gauges are sensitive to temperature so compensation is required which is provided by 

1) Use of adjacent arm balancing or compensating gauge 2) Self compensation 3) Use of special circuit

Adjacent arm compensative gauge:- It is used a dummy gauge in adjacent arm. gauge 1 is installed as active gauge by while gauge 3 is installed as dummy gauge. It is not subjected to any strain. The gauges installed on the test piece and the dummy gauge are at the same temperature. Initially when the bridge is balance . Under change in temperature R1 and R3 changes unequally to balance the bridge the changes should be equal in amount so as the bridge will be insensitive to temperature variation. So the dummy gauge is introduced in arm 3 which is identical to active gauge.

Diagram:-

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