A strain gauge with 120 resistance for no strain has a gauge factor,GF=2.13 . It

Question

A strain gauge with 120 resistance for no strain has a gauge factor,GF=2.13 . It is used in the bridge circuit shown below.

a) What is the gauge resistance for a strain of 200

A strain gauge with 120 resistance for no strain has a gauge factor,GF=2.13 . It is used in the bridge circuit shown below. What is the gauge resistance for a strain of 200 mu ? What is the bridge output for this strain? Derive an equation for the bridge output in terms of strain. Develop a "straight line" sensor model using the equation from part c about the operating strain of 200 mu and include the Scale Factor and Bias. Note: this is not truly a linear system

Explanation / Answer

1)120*(1-2.13*200*10^(-6))=119.94 ohms

b)output=2*((120/(120+120))-(119.94/(119.94+120))=0.25 mV

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