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A semiconductor strain gauge has a much larger gauge factor than a metallic one because of

  • A.the greater number of turns of the sensing element in a small area
  • B.the piezoresistive effect, a change of resistivity with strain
  • C.the much greater change of length it undergoes for a given stress
  • D.the very high resistance of the semiconductor material used

Answer: B

Straining a semiconductor alters the mobility of its carriers, so the resistivity changes by far more than the geometry does. That gives gauge factors above a hundred, but the effect is nonlinear and strongly temperature dependent, so a metallic gauge is preferred for accurate work.

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