A piezoelectric device is provided that comprises a mechanical amplifier adapted to produce a displacement output andor receive a force input, and first and second flexible platforms connected to the mechanical amplifier. The system further comprises processing means arranged to receive detection signals from the detection means, to process the detection signals to measure a signal parameter of the detection signals that varies with a parameter of the object, and may generate a sensor output that varies in response to changes in the signal parameter. The examiningmonitoring results can be indicated on the computer measurement display, where the operations of catching speeding vehicles, stolen vehicles, or any vehicles that violates traffic regulations are also displayed.