In this note, we are going to learn about the Gauge Factor of a strain gauge. Also, the Formula of the gauge factor and its values. Welcome to Poly Notes Hub, a leading destination for polytechnic engineering notes.
Author Name: Arun Paul.
What is Gauge Factor?
Gauge factor (GF) is the ratio of relative change in electrical resistance to the mechanical strain.
Formula of Gauge Factor:
Where:
- ΔR = Change in resistance
- R = Original resistance
- ε = Strain
Gauge Factor Range of Metal and Semiconductor Strain Gauge
| Type of Strain Gauge | Gauge Factor (GF) Range | Description |
|---|---|---|
| Metal Strain Gauge | 2 – 5 | Commonly used strain gauge made from metallic alloys like constantan or nichrome. It has good stability and moderate sensitivity. |
| Semiconductor Strain Gauge | 50 – 200 | Made from semiconductor materials like silicon or germanium. It has very high sensitivity but is more affected by temperature changes. |