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Measurement of Force, Torque, and Other Mechanical Variables With Strain Gages

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Other Strain Gage Based Transducers
 
In general, any mechanical variable involving force or torque can be measured with a strain-gage-instrumented spring element. For example, a cantilever beam with a mass attached to the free end becomes an accelerometer when gages are installed and connected as shown below. The force applied to the beam is, by Newton's second law, equal to the product of the mass and acceleration. Thus, the circuit output can be calculated from Eq.(3) , where the force P = M x A. To produce a satisfactory accelerometer it is necessary, of course, to consider practical aspects of the design such as damping and the system's natural frequency.
 

Concept For Strain-Gage-Based Accelerometer