Common methods use
strain gauges and image correlation photogrammetry, while some other methods are available which measure the displacement and then calculate the strain.
where W--constant (W = 100 was assumed), [R.sub.1i]--measured value of resistance for deflection [X.sub.i] (where the number of measurements i = 1 to 100), [R.sub.10] - initial resistance of a
strain gauge (for deflection [X.sub.1] = 0 mm).
The basic issue of measuring with
strain gauges is to locate them properly on the structure.
Therefore, a sensor with
strain gauges was designed for the purpose of biaxial force measurement.
Figure 4 presents comparison of torque versus time behavior derived from
strain gauge signals during calibration on TSHB apparatus.
Louis Statham, a physicist at the Curtiss-Wright Airplane Company, subsequently developed an unbonded
strain gauge and pioneered a transducer manufacturing company using this technology.
Moving a
strain gauge even slightly on the board may yield drastically different results.
Automation of the weight-changing mechanisms of these machines was accomplished about 1989, along with the implementation of instruments for the precise automated measurement of the responses of
strain gauge load cells used for measuring force.