Vibrating wire
A vibrating wire sensor measures force (a mechanical load) using a wire that vibrates at a high frequency. The applied external force changes the tension on the wire, this changes the frequency. The frequency is measured and indicates the amount of force on the sensor. The load sensor has an integrated electronic system to both activate the vibrating wire as well as to read the frequency. This can be compared to a guitar: animating the strings, creates a vibration and a sound. The sound will be dependent on the tension on the strings.
See also
Strain Gauge http://www.geovan.com/en/geotechnical_instruments/strain-gauge/
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