Parametric Array Signal Generating System using Transducer Array

Lee Jaeil; Lee Chong Hyun†; Bae Jinho; Paeng Dong-Guk; Choe Mi Heung*; Won-Ho** Kim Won-Ho**

doi:10.7776/ASK.2013.32.4.287

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2013 Vol.32, Issue 4 Next Page

Parametric Array Signal Generating System using Transducer Array 트랜스듀서 배열을 이용한 파라메트릭 배열 신호 생성 시스템

31 July 2013. pp. 287-293

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Abstract

We present a parametric array signal generating system using 3×16 transducer array which is composed of multi-resonant frequency transducers of 20kHz and 32.5kHz. To drive transducer array, sixteen channel amplifier using LM1875 chips is designed and implemented, and the PXI system based on the LabView 8.6 for arbitrary signal generation and analysis is used. Using the proposed system, we measure sound pressure level and beam pattern of difference frequency and verify the nonlinear effect of difference frequency. The theoretical absorption range and the Rayleigh distance are 15.51m and 1.933m, respectively and we verify that sound pressure of difference frequency is accumulated and increased at the near-field shorter than the Rayleigh distance. We verify that the beam pattern of the measured difference frequency and the beam pattern obtained by the superposition of two primary frequencies are similar, and high directional parametric signal was generated.

Keywords

Parametric array

Acoustic signal processing

Beam pattern

SPL of difference frequency

Multi resonant transducer

본 논문에서는 20 kHz와 32.5 kHz에 공진 주파수를 갖는 다공진 트랜스듀서를 3×16 배열로 구성하여 파라메트릭 배열 신호를 생성하는 시스템을 제안한다. 배열 트랜스듀서를 구동하기 위해 LM1875증폭기 소자를 이용하여 16채널 다중 증폭기를 제작하였고, 임의의 파형 생성 및 분석을 하기 위해 PXI 시스템과 LabView 8.6을 이용한 시스템이 구축되었다. 구축된 시스템을 이용하여 거리에 따른 음압레벨 변화와 빔 패턴을 측정하여 파라메트릭 현상을 확인하였다. 이론적으로 계산된 차 주파수의 감쇠거리와 회절거리는 각각 15.51 m와 1.9332 m이며, 음압레벨 실험결과 회절거리 이전 근거리 음장에서 차 주파수의 음압이 누적되어 증가되는 현상을 확인 하였다. 실험을 통해 측정된 차 주파수의 빔 패턴은 2개의 1차 주파수가 중첩된 빔 패턴과 유사함을 확인하여 고지향 파라메트릭 신호가 생성됨을 확인하였다.

키워드

파라메트릭 배열

음향 신호처리

빔 패턴

차 주파수 음압레벨

다공진 트랜스듀서

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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 :4
Pages :287-293
Received Date : 2012-05-31
Revised Date : 2012-09-25
Accepted Date : 2013-03-20
DOI :https://doi.org/10.7776/ASK.2013.32.4.287

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

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