Chapter-12| Strain Measurement

We all know about stress and stain and its relation. But have you ever know about the measurement of Strain.

The strain gauge is fundamental of many types of sensors like pressure sensors, load cells, torque sensors, etc.

The most common form of strain gauge is the electrical resistance strain gauge.

The gauges are formed by either a length of wire arranged in an axial grid pattern or by etching a thin metal foil into the desired shape.

By Izantux – WikiCommons, CC0,

Most strain gauges are foil types.

Foil Strain gauge

By Pleriche – Own work, CC BY-SA 4.0,

Foil strain gauges are available in a wide choice of shapes and sizes to suit a variety of applications.

They operate by simple principle i.e. As the foil is subjected to stress, the resistance of foil changes in a defined way.

Normally, wire gauges are used for high-temperature applications and foil gauges are used for routine applications.

Some important parameter about Foil gauges are

  • High stability
  • Good proportionality
  • Easy manufacturing
  • Low output voltage(requires amplification)

A strain gauge’s conductors are very thin if it made of round wire, about 1/1000 inch in diameter.

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