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A new system for measuring the impact of the waves on the shore has been developed. The system has the following characteristics.
- Generally of the parameter to be measured and recorded. This oriented us in using pressure transducers instead of using directly strain gauges. The techniques based directly on strain gauges are in fact more suitable for measuring hydrodynamic forces acting on specific objects (organisms or parts of organisms).
- Wide operational range for use under different conditions of waves impact (sheltered to very exposed shores). This required flexibility to calibrate the instruments both mechanically and electronically.
- Automatic and possibly programmable recording of wave impact. This oriented toward a system including a microprocessor.
- Robustness and waterproofing of the instrument, resist the conditions met in the surf and swash zone. This requires appositely designed mechanics.
- Relatively low costs for replicating the prototypes on a reasonably large scale. This induced us to discard the idea of radiotransmission of the signals, which on the side of the receiving-logging unit is relatively costly, and to design a system with in-borne memory to be downloaded.
The present prototype includes two different transducers having different operating range: the more sensible gives a liner response between 0 and 100 kPascal, while the less sensible gives a liner response between 0 and 500 kPascal. The system for detecting the incoming tide is given by a CNY70 optoelectronic transducer, plus original circuitry to allow calibration to different characteristics of incoming water mass
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