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Investigate and test a strain gauge sensor using different materials. Aim To test and evaluate a sensor using two materials, (steel and wood) to determine the sensitivity and accuracy. Response time and reliability of the sensor will also be tested and the ability of the sensor to detect small changes will show in the results. Research A strain gauge is a device capable of translating a deformation (strain) into an electrical signal. This can also be used to measure force, pressure load or weight. Strain =Extension Area The above equation is used to calculate the strain and has no units because they are cancelled out (meters/meters=nothing). A strain gauge is connected in a wheatstone bridge it consists of 4 resistors arranged in a diamond orientation. An input DC voltage is applied between the top and bottom of the diamond and the output voltage is measured across the middle. When the output voltage is zero, the bridge is...

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