rOmV4 - Instrumentation Bridge Circuits

This circuit is quite common in instrumentation, especially if very small signals need to be processed.

Strain Gauge

For example a strain guage is made from four resistive zones.
If there are no forces acting, all the zones will have equal resistance.
In the presence of a force, some zones have increased and others have decreased resistance.
These gauges are used in weighing scales and also to monitor structures in civil engineering.
If the resistances are influenced by tenperature, they should all be equally affected and the effects should very nearly cancel out. This improves accuracy.

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Instrumentation Bridge Circuits

A Bridge Circuit and Difference Amplifier

Strain Gauge