Neutrally Buoyant Biomimetic Directional MEMS Sensor
Abstract
This thesis presents an analysis of a unique Micro Electrical Mechanical System (MEMS) sensor adapted for underwater sound detection and localization. The sensor is inspired by the hearing system of the Ormia ochracea parasitoid fly and is being investigated to serve as a miniature replacement, or supplement, to traditional underwater sound detection systems such as hydrophones and hydrophone arrays. The sensor operates at its resonant frequency as a single-axis, in-plane, capacitive sensing accelerometer with two mechanically coupled sensing elements, and it possesses inherently dipole directionality. The mechanisms for sound detection using this sensor are discussed, and an engineering approach to underwater sound detection in a neutrally buoyant configuration is demonstrated. The sensitivity of the sensor was 0.81 V/mg (-131.9 dB re 1V/Pa), and its noise spectral density was 95 V/Hz. Cross-axial sensitivity was -13 dB. Measurements verified that the sensors characteristics operating in air did not change while operating underwater in a neutrally buoyant configuration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2020
- Accession Number
- AD1221941
Entities
People
- Leland Mccarty
Organizations
- Naval Postgraduate School