Gauge factor

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Strain Gauge factor (G) or strain factor is the product of strain and the quotient of change in strain gauge resistance and unstrained resistance of strain gauge. Strain gauge factor is a factor usually associated with strain gauge (ε), circuit Temperature measurement and the Wheatstone bridge.

The gauge factor, G, is given by:

\varepsilon G = \frac{\Delta RB}{RB} = \alpha \theta

G = \frac{\Delta R / R}{\Delta L / L} = \frac{\Delta R / R}{\varepsilon}

Where

  • ε = strain
  • ΔRB = change in strain gauge resistance
  • RB = unstrained resistance of strain gauge
  • α = temperature coefficient
  • θ = temperature change
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