A Set-Up of 7 Laser Triangulation Sensors and a Draw-Wire Sensor for Measuring Relative Displacement of a Piston Rod Mechanical Lead-Through Transmission in an Offshore Wave Energy Converter on the Ocean Floor
Figure 21
Sensor output (black) and centered moving averages (red) between 14:10 and 14:11 hours on the 28th of May 2009. (a) Piston rod outside length measured by the draw-wire sensor with free stroke length indicated by two blue lines and maximum stroke length indicated by two brown lines. (b) Distance from middle of measurement range (MMR) towards piston rod surface for PRLS 1. (c) Distance from MMR towards piston rod surface for PRLS 2. (d) Distance from MMR towards piston rod surface for PRLS 3. (e) Distance from MMR towards seal housing surface for SHLS 1. (f) Distance from MMR towards seal housing surface for SHLS 2. (g) Distance from MMR towards seal housing surface for SHLS 3. (h) Distance from MMR towards the bottom surface of the seawater collector, which is attached to the seal housing, for SHLS 4.
