Gauge Factor
The gauge factor is defined as:
where
- is the change in resistance caused by strain,
- is the resistance of the undeformed gauge, and
- is strain.
For metallic foil gauges, the gauge factor is usually a little over 2. For a single active gauge and three dummy resistors, the output from the bridge is:
where
- is the bridge excitation voltage.
Foil gauges typically have active areas of about 2–10 mm2 in size. With careful installation, the correct gauge, and the correct adhesive, strains up to at least 10% can be measured.
Read more about this topic: Strain Gauge
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