Question

A cantilever beam uses four strain gages to make a load ceil. With a fixed beam material and constant beam dimensions, how can the sensitivity of the load cell be increased? O higher excitation voltage and higher gage factor O higher excitation voltage and lower gage factor 。lower excitation voltage and lower gage factor O lower excitation voltage and higher gage factor

Answer 1

The sensitivity of a load cell is given by S = lambda (1 + v) E_exc/2 A E lambda rightarrow Gauss Factor v rightarrow Poisson's ratio rightarrow Constant for material E_exc rightarrow Excitation voltage A rightarrow Cross Sectional Area rightarrow Dimensions dependent E rightarrow Modulus of elasticity rightarrow depends on material With a fixed beam constant dimensions and material S proportional lambda E_exc/2 S proportional lambda E_exc Therefore S proportional lambda rightarrow Gauss Factor S proportional E_exc rightarrow Excitation voltage therefore option (1) is correct Higher the lambda and higher E_exc increases S

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