Resonant-Wire Devices

Using resonant-wire devices to measure pressure

The resonant-wire device is a relatively new instrument which has emanated from recent advances in the electronics field. Wire is stretched across a chamber containing fluid at unknown pressure subjected to a magnetic field. The wire resonates at its natural frequency according to its tension, which varies with pressure.

Thus pressure is calculated by measuring the frequency of vibration of the wire. Such frequency measurement is normally carried out by electronics integrated into the cell. Such devices are highly accurate, with ±0.2% of full-scale reading being typical, and they are particularly insensitive to changes in ambient conditions.

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