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Overview of Weight Measurement Methods

Overview of Weight Measurement Methods - uniform bond...

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Jason Fox Ed Farrell Jeremy Davia ENGR160-02 5/12/2009 Overview of Weight Measurement Methods: Weight can be measured in a variety of different ways. Some of the most common methods are purely mechanical, such as a fish scale or a produce scale at a super market. These scales typically employ a spring that will undergo tensile stress ( T σ ) and stretch proportionally to a given weight according to Hooke’s Law and the modulus of elasticity of the material used for the spring. For the purposes of this design an electromechanical system of weight measurement has been designed. By bonding a strain gage to an aluminum sensing beam and wiring the gage to a Wheatstone bridge, a voltage differential can be measured and calibrated using known weights. With a strong and
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Unformatted text preview: uniform bond between the strain gage and sensing beam, the stress undergone by the beam will transferred to the strain gage resulting in a strain on the wires of the gage and thus a change in resistance of the gage. Like the spring scales, the mechanical properties of the aluminum beam, according to Hooke’s Law, will determine how much stress is experienced for a given weight. This stress will then transfer to the strain gage, imparting a strain, or stretching/compressing of the wires of the gage, and thus changing the resistance of the gage proportionally according to its Gage Factor....
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