Metal Foil Strain Gauge

Metal Foil Strain Gauge

Metal Foil Strain Gauge

When a metallic conductor is stretched or compressed, its resistance changes due to a change in the length and diameter (cross-section) of the conductor.Hence a strain Gauge is a measurement transducer used to measure strain (that is, relative changes in dimension). It is a Transducer because it converts information about relative change in dimension to a change in resistance.

This type of Strain Gauge comes under the classification of Bonded Strain Gauge since it is bonded on the case under study.

Description

The arrangement consists of the following;

The metal foil of 0.02mm thick is produced using the printed circuit technique. This metal foil strain gauge is produced on one side of the plastic backing. Leads are soldered to the metal foil for electrically connecting the gauge to a measuring instrument (wheat stone bridge).

OperationsWith the help of an adhesive material, the 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 it is bonded to the structure, the stain gauge will also undergo change in both in length and cross-section (that is, it strained). This strain (change in dimension) changes the resistance of the gauge which can be measured using a wheat stone bridge. This change in resistance of the strain gauge becomes a measure of the extent to which the structure is strained and a measure of the applied force when calibrated.

Advantages

* These can be manufactured in any shape.

* Perfect bonding of the device is possible with structure under study.

* The backing can be peeled off and the metal foil with leads can be used directly on the structure under study. In such cases, a ceramic adhesive is to be used.

* These gauges have a better fatigue life.

* Has good sensitivity and have stability even at high temperatures.

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