Design of a Multimode Piezoelectric Spherical Vector Sensor for a Cardioid Beam Pattern

Youngsub Lim; Jaeyoung Lee; Cheeyoung Joh; Heeseon Seo; Yongrae Roh

doi:10.7776/ASK.2013.32.1.032

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Design of a Multimode Piezoelectric Spherical Vector Sensor for a Cardioid Beam Pattern 심장형 빔 패턴을 위한 다중모드 압전 구형 벡터센서 설계

31 January 2013. pp. 32-42

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Abstract

Typical underwater piezoelectric spherical sensors are omni-directional, thus can measure the scalar quantity sound-pressure-magnitude only with the limitation not being able to measure the direction of the incoming wave. This paper proposes a method to simultaneously measure both the magnitude and direction of the sound wave with the spherical sensor. The method divides the piezoceramic sphere of the sensor into eight elements, and distinguishes the magnitude and direction of the sound pressure by combining the output voltage of the elements in a particular manner. Further, through the analysis of the sensitivity variation in relation to the structural parameters like radius and thickness of the piezoceramic sphere, we have suggested the way to improve the sensitivity of the vector sensor.

Keywords

Spherical sensor

Vector sensor

Cardioid,

Beam pattern

일반적인 수중 탐지용 압전 구형 센서는 무지향성이어서 스칼라 양인 수신 음압의 크기만 측정할 뿐 전파 방향은 측정 할 수 없는 한계를 가지고 있다. 본 논문에서는 이러한 구형 센서를 이용해 음파의 크기와 방향을 동시에 찾을 수 있는 방법을 제안한다. 제안한 방법은 구형 센서의 압전 세라믹을 8등분하여 배열한 다음, 각 압전 세라믹 출력 전압을 특정한 방법으로 조합하여 음압의 크기와 방향을 파악할 수 있도록 하였다. 또한 압전세라믹 구의 반경과 두께와 같은 구조 변수들의 변화에 따른 감도 변화를 분석하여, 벡터 센서의 감도를 향상 시킬 수 있는 방안을 제시하였다.

키워드

구형 센서

벡터센서

심장형

빔 패턴

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 32
No :1
Pages :32-42
Received Date : 2012-09-14
Accepted Date : 2012-10-24
DOI :https://doi.org/10.7776/ASK.2013.32.1.032

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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