Two Canted Mems Acoustic Sensors for Finding Direction in Underwater

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Abstract:

Micro electromechanical system (MEMS)-based acoustic sensors can be operated in the pressure gradient mode to obtained direction of underwater sound. A single MEMS sensor is unable to resolve left and right ambiguity due to cosine directional response. However, recent measurements carried out in air using two such sensors mounted at a canted angle allowed the determination of baring of sound unambiguously. In this thesis, the work carried out in air will be extended for applications in underwater by using two canted MEMS sensors packaged operate in an underwater environment. The canted system will be characterized in an anechoic chamber with and without underwater packaging and then using the NPS water tanks. The measurements include frequency and directional responses to determine their ability of operating in an underwater environment to accurately obtaining the bearing of sound.

Author(s):
Park, Kwangjun
Author Organization(s):
Naval Postgraduate School
Funding Organization(s):
Naval Postgraduate School, Monterey , CA
Document Type:
Technical Report/Master's Thesis
Publication Date:
2020 Sep 30
Pagination:
55

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release

RECORD

Collection: TRECMS
Subject Terms
Modernization Areas:
Microelectronics
Communities of Interest:
Sensors
Descriptor(s):
acoustics, microelectromechanical systems, acoustic detectors, measurement, sound pressure, construction, detection, frequency response, water tanks, acoustic absorption, acoustic measurement, acoustic propagation, acoustic waves, amplifiers, anechoic chambers, circuit boards, direction finding
Keyword(s):
canted
Subject Categories:
Navigation, Detection and Countermeasures; Navigation, Detection and Countermeasures
Creation Date:
2023 Mar 28
Update Date:
2023 Jun 13