Sensor requirements Clause Samples

Sensor requirements. Wave height is a dynamic physical parameter therefore the sensor ability to transfer exactly the water elevation variations to electrical variations must be carefully checked. The measuring range and the sensor bandwidth directly depend on the wave maker capacities. One criterion to define the sensor dynamic specifications can be the correct measurement of the 3rd order ▇▇▇▇▇▇ wave harmonics of the shortest regular wave possible in the tank. Irregular wave time series generated in the tank can also be considered. The fastest water elevation variation must be measurable in order to capture all the spectral components. D4.01EC Resistive wave probes, relating the resistance measured between two metal rods partly immersed in water to the water elevation between them, are the most common sensors used in wave tanks. Capacitance wave probes become more and more used, as they present some advantages over resistive wave probes. They measure the water elevation using purely digital techniques, with no energy discharge in water and no interference with the adjacent probes. They also are not as sensitive to water temperature, allowing fewer re-calibrations, and present a faster response time. Another type of wave gauges, servo wave gauges are now described with their technical specifications.