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Foil type strain gauge

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Foil type strain gauge In Foil type strain gauge we use thin sheets or foils of 5 micro metre thick. by photo etching or masked vacuum deposition process , based on our requirement or application we can shaped the strain gauge. The end turns are made fat so as to reduce the contribution from the transverse strain which is a superiors input. Metal Foil Strain Gauge The arrangement consists of the following; The metal foil of 0.02mm thick is produced using the printed circuit technique. This metal foil is produced on one side of the plastic backing. Leads are soldered to the metal foil for electrically connecting the strain gauge to a measuring instrument (wheat stone bridge). Operations of Metal foil Strain gauge With the help of an adhesive material, the strain gauge is pasted/bonded on the structure under study. Now the structure is subjected to a force (tensile or compressive). Due to the force, the structure will change the dimension. As the strain gauge is bonded to the structure, ...
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Wire wound strain gauge

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Wirewound strain gauge There are two types of wirewound strain gauge  bonded and unbonded. Bonded strain gauge It consists of specimen surface  Gauge is directly bonded with the surface of the specimen  surface being tested. The thin layer of adhesive cement is also there this cement is  not only serve to transmit the strain from the specimen to the gauge wire but also act as an insulator. Depending upon the application the bonded strain gauge have various structure so we can use this structure as our application. Unbonded strain gauge These strain gauges are not directly bonded onto the surface of the structure under study. Hence they are termed as unbounded strain gauges. Description of the Unbonded Strain gauges: The arrangement of an unbonded strain gauges consists of the following. Two frames P and Q carrying rigidly fixed insulated pins as shown in diagram. these two frames can move relative with respect to each other and they are ...
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