Reduced-Dimension Beam-Space Broad-Band Source Localization: Preprocessor Design

1988 ◽  
Author(s):  
Kevin M. Buckley ◽  
Xiao L. Xu
Keyword(s):  
Source Localization ◽  
Broad Band ◽  
Reduced Dimension

scholarly journals Seismo-volcano source localization with triaxial broad-band seismic array

2011 ◽  
Vol 187 (1) ◽  
pp. 371-384 ◽  
Author(s):  
L. A. Inza ◽  
J. I. Mars ◽  
J. P. Métaxian ◽  
G. S. O’Brien ◽  
O. Macedo
Keyword(s):  
Source Localization ◽  
Broad Band ◽  
Seismic Array

Source localization with broad-band matched-field processing in shallow water

1996 ◽  
Vol 21 (4) ◽  
pp. 402-412 ◽  
Author(s):  
N.O. Booth ◽  
P.A. Baxley ◽  
J.A. Rice ◽  
P.W. Schey ◽  
W.S. Hodgkiss ◽  
...  
Keyword(s):  
Shallow Water ◽  
Source Localization ◽  
Broad Band ◽  
Matched Field Processing

Matched-field processing for broad-band source localization

1996 ◽  
Vol 21 (4) ◽  
pp. 384-392 ◽  
Author(s):  
Z.-H. Michalopoulou ◽  
M.B. Porter
Keyword(s):  
Source Localization ◽  
Broad Band ◽  
Matched Field Processing

Broad-band Matched-Field Source Localization in the East China Sea

2004 ◽  
Vol 29 (4) ◽  
pp. 1049-1054 ◽  
Author(s):  
R. Zhang ◽  
Z. Li ◽  
J. Yan ◽  
Z. Peng ◽  
F. Li
Keyword(s):  
East China Sea ◽  
Source Localization ◽  
Broad Band ◽  
East China ◽  
The East China Sea ◽  
Field Source ◽  
China Sea

SOUND SOURCE LOCALIZATION IN THREE-DIMENSIONAL SPACE IN REAL TIME WITH REDUNDANCY CHECKS

2012 ◽  
Vol 20 (01) ◽  
pp. 1250007 ◽  
Author(s):  
NA ZHU ◽  
SEAN F. WU
Keyword(s):  
Source Localization ◽  
Signal To Noise Ratio ◽  
Dimensional Space ◽  
Broad Band ◽  
Three Dimensional ◽  
Sound Sources ◽  
Detection Range ◽  
Basic Model ◽  
Improved Model ◽  
Three Dimensional Space

Triangulation is commonly used for source localization and most triangulation applications are based on intersection of the bearing direction to locate a source on a two-dimensional plane. In this paper, two new mathematical models (a basic model and an improved one) that expands the traditional triangulation concept to three-dimensional space are developed to locate multiple incoherent sound sources. The basic model uses four microphones and concentrates on solving a set of three quadratic equations simultaneously. The improved model requires more than four microphones and uses the solution from the basic model, as well as analyzing the intersection of bearing angles. Redundancy checks on the time differences of arrival are added to further reduce the source localization error in the improved model. Moreover, the input data are pre-processed and de-noised through filtering and windowing to enhance the effective signal to noise ratio. Various sound sources are tested, including transient, impulsive, continuous, broad-band, and narrow-band sounds. Numerical simulations and experimental validation using the real world sound sources are conducted. The impacts of the source direction/source detection range on the accuracy of source localization results are examined and discussed.

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

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