- Vlll - 



LIST OF FIGURES AND TABLES 



Figure 



1-1,2,3 Approach of a long-crested wave to 



two adjacent pressure sensors 4 



11-1,2,3 Instrument response to a five-foot 



surface wave in varying water depths 10 



II -4 Differential pressure transducer response 

 to a five-foot surface wave in twenty-five 

 feet of water with varying deployment depths . . 11 



II-5 Schematic representation of the DPG 13 



II-6 Differential pressure response with 



water depth and frequency 19 



III-l The DPG Instrument . , 21 



III-2 The DPG instrument secured to the steel cradle . 22 



III-3 Rendering of the DPG fuselage, arms, sensors, and 



water-tight instrumentation cylinder 23 



III-4 Assembly drawing of an isolation sensor diaphragm 2? 



III-5 Isolation sensor diaphragms shown attached 



"by flexible and nylon tubing through the top 



of the water-tight instrumentation cylinder 



and into the transducers 28 



III -6 Assembled water-tight instrumentation cylinder 



with sensors penetrating the top plate 30 



III-7 The transducer stack before insertion into 



the instrumentation cylinder ..... 31 



III-8 Wiring diagram for the DPG 34 



