Paper Title:
Multi-Reference Scan-Based Nearfield Acoustical Holography
  Abstract

Multi-reference, scan-based Nearfield Acoustical Holography (NAH) is a useful measurement tool that can be applied when an insufficient number of microphones are available to make measurements on a complete hologram surface simultaneously. The scan-based procedure can be used to construct a complete hologram by joining together sub-holograms captured using a relatively small, roving scan array and a fixed reference array. For the procedure to be successful, the source levels must remain stationary for the time taken to record the complete hologram: that is unlikely to be the case in practice, however. Usually, the reference signal levels measured during each scan differ from each other with the result that spatial noise is added to the hologram. A non-stationarity compensation procedure that is based on the acoustical transfer functions between the sources and both the reference and scanning, field microphones are invariable is introduced. Numerical and experimental results show well the availability of the introduced procedures to suppress the spatially distributed noise and to get better sound fields partially separated.

  Info
Periodical
Key Engineering Materials (Volumes 321-323)
Edited by
Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi
Pages
1249-1252
DOI
10.4028/www.scientific.net/KEM.321-323.1249
Citation
H. S. Kwon, "Multi-Reference Scan-Based Nearfield Acoustical Holography", Key Engineering Materials, Vols. 321-323, pp. 1249-1252, 2006
Online since
October 2006
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Xiao Ma, Li Chen, Qing Hua Lin, Huan Kun Xu, Sha Lei, Feng Liu
Power and Fluid Machinery
Abstract:Digital Lensless Fourier Holography setup for recording and reconstructing object is presented. By using optical fiber of high numerical...
2152
Authors: Hai Chao Zhu, Zhi Min Chen, Xiang Hua Du, Rong Fu Mao
Chapter 1: Vibration Engineering
Abstract:Support vector regression is used to establish a kind of patch near-field acoustic holography. The regression functions are constructed by...
196
Authors: Shao Chun Ding, Lin Na Zhou, Jing Jun Lou, Shi Jian Zhu
Chapter 3: Measuring Technology and Mechatronics
Abstract:we use the NAH method for the simulation and analysis of sound power level and source level with the plan measuring surface under the same...
1575
Authors: Shi Zhe Tan, Sheng Xu Wang
Chapter 2: Computer Science and Computational Science, Information Processing
Abstract:Designing an advanced method to sensing marine plankton effectively is highly demanded for acquiring critical marine plankton information...
314
Authors: Zhi Wei Li, Tao Feng, Zhi Gang Huang, Bin Su, Ran Li, Ya Jun Li, Yao Wu
Chapter 4: Mechanics, Thermal and Dynamics Systems, Vibration, Noise, Applied Mechanics and Numerical Simulation Applications
Abstract:According to the Near-Field Acoustic Holography (NAH) theory, we designed a measurement system, which was used to localize the noise source...
898