Publication detail

Near field acoustic holography with double layer array processing

HAVRÁNEK, Z. JACOBSEN, F.

Original Title

Near field acoustic holography with double layer array processing

English Title

Near field acoustic holography with double layer array processing

Type

conference paper

Language

en

Original Abstract

Near field acoustic holography (NAH) is an experimental technique for analysing sound fields near sources. A simulation study has been carried out, and this paper examines and compares i) classical planar NAH based on spatial transforms (single layer NAH), ii) a similar technique based on measurements in two parallel planes (double layer NAH), and iii) a method that avoids spatial transforms and thus leakage by using statistical considerations (SONAH). The source is a point driven panel that generates a complicated sound field. The influence of reflections and background noise from other sources is examined. The results indicate improved accuracy in localisation and characterisation of a sound source with double layer array processing in the presence of sources from the "wrong" side of the measurement array. An investigation of the influence of transducer mismatch errors on the global accuracy of the NAH calculations shows that NAH with single and double layer arrays are affected in a similar manner.

English abstract

Near field acoustic holography (NAH) is an experimental technique for analysing sound fields near sources. A simulation study has been carried out, and this paper examines and compares i) classical planar NAH based on spatial transforms (single layer NAH), ii) a similar technique based on measurements in two parallel planes (double layer NAH), and iii) a method that avoids spatial transforms and thus leakage by using statistical considerations (SONAH). The source is a point driven panel that generates a complicated sound field. The influence of reflections and background noise from other sources is examined. The results indicate improved accuracy in localisation and characterisation of a sound source with double layer array processing in the presence of sources from the "wrong" side of the measurement array. An investigation of the influence of transducer mismatch errors on the global accuracy of the NAH calculations shows that NAH with single and double layer arrays are affected in a similar manner.

Keywords

acoustic holography, sound sources, acoustic pressure, double-layer microphone array

RIV year

2008

Released

04.07.2008

Publisher

EAA

ISBN

978-2-9521105-7-0

Book

Archives (1992-2008) of the EUROpean Conference on NOISE control, euronoise on CD-ROM

Edition number

1

Pages from

1

Pages to

6

Pages count

6

Documents

BibTex


@inproceedings{BUT26670,
  author="Zdeněk {Havránek} and Finn {Jacobsen}",
  title="Near field acoustic holography with double layer array processing",
  annote="Near field acoustic holography (NAH) is an experimental technique for analysing sound fields near sources. A simulation study has been carried out, and this paper examines and compares i) classical planar NAH based on spatial transforms (single layer NAH), ii) a similar technique based on measurements in two parallel planes (double layer NAH), and iii) a method that avoids spatial transforms and thus leakage by using statistical considerations (SONAH). 
The source is a point driven panel that generates a complicated sound field. The influence of reflections and background noise from other sources is examined. The results indicate improved accuracy in localisation and characterisation of a sound source with double layer array processing in the presence of sources from the "wrong" side of the measurement array. An investigation of the influence of transducer mismatch errors on the global accuracy of the NAH calculations shows that NAH with single and double layer arrays are affected in a similar manner.",
  address="EAA",
  booktitle="Archives (1992-2008) of the EUROpean Conference on NOISE control, euronoise on CD-ROM",
  chapter="26670",
  howpublished="electronic, physical medium",
  institution="EAA",
  year="2008",
  month="july",
  pages="1--6",
  publisher="EAA",
  type="conference paper"
}