What factors affect the sensitivity of a strain gauge?
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Gauge Factor: The gauge factor is a key factor affecting sensitivity, representing the ratio of the fractional change in electrical resistance to the fractional change in length (strain) of the material.
Material Properties: Different materials have different gauge factors and sensitivity to strain. Properties such as Young’s modulus, Poisson’s ratio, and thermal coefficients of expansion impact sensitivity.
Gauge Length and Width: Longer and narrower gauges generally exhibit higher sensitivity because they experience greater strain for a given deformation.
Mounting Arrangement: Proper mounting techniques ensure that the strain gauge experiences maximum strain, influencing sensitivity.
Temperature Effects: Temperature changes affect sensitivity due to thermal expansion and contraction. Temperature compensation techniques are used to maintain sensitivity.
Electrical Noise: Electrical noise in the measurement system can reduce sensitivity. Shielding, grounding, and filtering techniques minimize noise to enhance sensitivity.
Signal Conditioning: The quality of signal conditioning affects sensitivity. Proper conditioning amplifies the signal and enhances sensitivity.