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MEMORANDUM TO: DR. P. S. SHIAKOLAS FROM: SALMAN KARIM SUBJECT: STRAIN GAGE SENSORS DATE: 6/15/2009 CC: MR. NITIN UPPAL Made of a thin piece of conducting material, the strain gage is one of the most widely used strain measurement sensors. It is glued on to the device where you want to measure strain. And its principal purpose is to convert mechanical motion into an electronic signal. A change in resistance is proportional to the strain experienced by the sensor. For this particular experiment, a strain gage is used to measure the deflection of a metal ruler, and the data is recorded by lab view software. The experiment was conducted to have a better understanding of strain gages and the usage of the analog circuit arrangement in order to measure the change in resistance. This resistance is directly related to the strain by a factor, called the strain sensitivity of the sensor and caused by the deformation of the object. The figure below shows the construction of analog circuit: Figure 1 : Analog sensor circuit for using a strain gage as a deflection sensor A 120 Ω strain gage, which includes two wire leads, was attached to a bendable ruler. The Wheatstone bridge circuit shown above on the left side of the dotted line in Figure 1 was constructed on an electronic breadboard. Since the resistance in the strain gage that was placed on the ruler was 120 , the resistors on three arms of the Wheatstone bridge were all 120 to
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avoid any DC bias voltage ( R B1 = R B2 = R B3 = 120 Ω). The LMC6484 operational amplifier (shows on the right side of the dotted line in Figure 1) was used to amplify the voltage output from the Wheatstone bridge which is shown on the figure below:
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This note was uploaded on 06/15/2009 for the course MAE 3183 taught by Professor Staff during the Spring '08 term at UT Arlington.

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