Strain gauges measuring the deflection of a sintered metal column are connected to a Wheatstone bridge. The

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Strain gauges measuring the deflection of a sintered metal column are connected to a Wheatstone bridge. The output of the bridge is balanced when there is no strain producing o \(\mathrm{V}\) output. As the column is deflected, the bridge produces \(150 \mu \mathrm{V} / 22\) change caused by the strain gauges. The maximum possible defection would result in a \(4-\Omega\) change. Design an instrumentation amplifier that can take the voltage created in the bridge and send it to a \(0-5 \mathrm{VADC}\), where no deflection produces \(\mathrm{O} \mathrm{V}\) at the \(\mathrm{ADC}\) and maximum deflection produces \(5 \mathrm{~V}\). To avoid loading, send the output of the bridge to a very high input resistance differential amplifier. The columns being tested are brittle and can shatter violently if the conditions cause the strain gauges to change by more than 3.922 . For safety, connect the output of your instrumentation amplifier to a comparator circuit that will trigger an alarm when the strain causes the resistance to change by \(3.75 \Omega\). The alarm needs to be triggered by \(15 \mathrm{~V}\).

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The Analysis And Design Of Linear Circuits

ISBN: 9781119913023

10th Edition

Authors: Roland E. Thomas, Albert J. Rosa, Gregory J. Toussaint

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