Feasibility study to adapt the microflown vector sensor for underwater use

• Main Author: Hezemans, Marnix J.M.
• Other Authors: Smith, Kevin B.
• Published: Monterey, California. Naval Postgraduate School 2013
• Online Access: http://hdl.handle.net/10945/27845

This thesis investigates the feasibility of adapting the Microflown PU match vector sensor for underwater use. After testing the proper functioning of the sensor, the best materials for the capsule are determined based on acoustic properties. The capsule is designed and built by NPS staff. To predict the sensitivity of the encapsulated sensor, the characteristic equations are modified to reflect the new medium. In order to be able to predict the sensitivity of the encapsulated sensor, the performance ratio is determined between the sensitivity in air and the filling fluid of choice. Temperature dependency is introduced in the relevant parameters to be able to model the sensitivity at various operating temperatures. The measured sensitivity from the calibration report is then used to predict its performance in castor oil. The theoretical sensitivity model is verified by experimental data gathered from calibration studies at NUWC. The verified model is then used to analyze the consequences of changing critical operating parameters like the distance between the filaments and the operating temperature. Based on these calculations, recommendations are made for a better performing prototype. Eventually a new design is proposed that increases sensitivity significantly and is better adapted to operate in the filling fluid.