STRAIN GAUGE INSTALLATION - OMEGA

E-12 ESTRAIN GAGESSTRAIN GAUGE INSTALLATIONHOW TO POSITION STRAIN GAUGES TO MONITORBENDING, AXIAL, SHEAR, AND TORSIONAL LOADS STRAIN is defined as the ratio of thechange in length to the initialunstressed reference length. A straingauge is the element that senses thischange and converts it into anelectrical signal. This can beaccomplished because a straingauge changes resistance as it isstretched, or compressed, similar towire. For example, when wire isstretched, its cross-sectional areadecreases; therefore, its important factors that must beconsidered before selecting a straingauge are the direction, type, andresolution of the STRAIN you wish measure minute strains, the usermust be able to measure minuteresistance changes. The WheatstoneBridge configuration, shown inFigure B, is capable of measuringthese small resistance the signs associated with eachgauge numbered 1 through 4.

Figure B, is capable of measuring these small resistance changes. Note the signs associated with each gauge numbered 1 through 4. The total strain is always the sum of the four strains. The total strain is represented by a change in V OUT. If each gauge had the same positive strain, the total would be zero and V OUT would remain unchanged. Bending,

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