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Load sensor

The sensing element is a simple metal wire suspended freely between two points on a base plate along the strain axis. Excited by induced vibrations the wire vibrates at its natural frequency which is determined by wire stress, wire length and material properties. Application of load to the base plate increases the strain in the wire resulting in a corresponding change in its vibrational frequency. A microwave transceiver directed toward the sensing wire emits a high frequency signal and receives the returned signal which is modulated by the vibrations of the wire. Demodulation of the high frequency signal results in a signal corresponding to the wire vibration. This signal is filtered, amplified and analyzed to determine its frequency and thereby the corresponding load on the base plate.