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Fabrication and Characterization of an Underwater Acoustic Tonpilz Vector Sensor for the Estimation of Sound Source Direction

음원의 방향 추정을 위한 수중 음향 Tonpilz 벡터 센서의 제작 및 특성 평가

Youngsub Lim1
,
Yongrae Roh2*
임 영섭1
,
노 용래2*
2School of Mechanical Engineering, Kyungpook National University
1경북대학교 센서 및 디스플레이공학과
2경북대학교 기계공학과
*교신저자. *Corresponding Author. 
30 September 2015. pp. 351-359
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Abstract

Typical underwater acoustic transducers detect only the magnitude of an acoustic pressure and they have the limitation of not being able to recognize the direction of the sound signal. Hence, the authors of this paper proposed a new vector sensor structure based on Tonpilz transducers that could detect both the magnitude and the direction of a sound pressure. In the proposed structure, the piezoceramic ring was divided into four segments, and proper combination of the output voltages of the segments in response to the external sound pressure could provide the information on the orientation of the sound source. In this paper, a Tonpilz transducer has been fabricated to have the proposed structure and its characteristics has been measured to confirm the validity of the proposed structure.

Keywords
Tonpilz
Vector sensor
Underwater
Transducer
Piezoceramic
Azimuthal angle

통상의 수중 음향 트랜스듀서는 음압의 크기만 측정할 뿐, 외부에서 들어오는 음향 신호의 방향은 파악할 수 없는 한계가 있다. 이에 본 논문의 저자들은 Tonpilz 트랜스듀서를 바탕으로 단일체로서 음압의 크기와 방향을 동시에 탐지해 낼 수 있는 새로운 벡터 센서구조를 제안하였다. 제안된 구조에는 압전세라믹 링이 4등분되어 있으며, 외부 음압에 대한 각 세라믹 조각의 출력전압을 적절히 조합하면 음원의 방향을 파악할 수 있는 특징을 가진다. 본 논문에서는 이러한 구조를 가지는 Tonpilz 벡터센서를 제작하고 그 특성을 실험적으로 측정하여, 제안된 구조의 타당성을 확인하였다.

키워드
Tonpilz
벡터 센서
수중음향
트랜스듀서
압전세라믹
방위각
References
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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 : 34
  • No :5
  • Pages :351-359
  • Received Date : 2015-06-05
  • Accepted Date : 2015-08-21
  • DOI :https://doi.org/10.7776/ASK.2015.34.5.351
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