SemiConductor type strain gauge
Semiconductor type strain gauge
In this type of strain gauge we use doped silicon or germanium as a sensing element.
When we apply stress to this type of material its Resistance is changed, by measuring the resistance change we can measure the stress applied on this material.
- Unlike other strain gauges, semiconductor strain gages are based upon the piezoresistive effects of silicon or germanium and measure the change in resistance with stress as opposed to strain.
- The semiconductor bonded strain gage is a wafer with the resistance element diffused into a substrate of silicon.
- No backing is provided for the wafer element and bonding it to the strained surface needs extra care since only a thin layer of epoxy is used to attach it.
- Size of a semiconductor strain gauge is much smaller and the cost much lower than for a metallic foil sensor.
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