Near-field blind deconvolution in a reverberant environment

Shima H. Abadi; Eric S. Haapaniemi; Andrew J. Femminineo; Laura M. Williamson; David R. Dowling

doi:10.1121/1.3654667

Near-field blind deconvolution in a reverberant environment

The Journal of the Acoustical Society of America ◽

10.1121/1.3654667 ◽

2011 ◽

Vol 130 (4) ◽

pp. 2411-2411

Author(s):

Shima H. Abadi ◽

Eric S. Haapaniemi ◽

Andrew J. Femminineo ◽

Laura M. Williamson ◽

David R. Dowling

Keyword(s):

Blind Deconvolution ◽

Near Field ◽

Reverberant Environment

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Multi-source localization based on approximated kernel density estimator and spatial likelihood function in near-field reverberant environment

2016 International Conference on Audio, Language and Image Processing (ICALIP) ◽

10.1109/icalip.2016.7846625 ◽

2016 ◽

Author(s):

Yu-Zhuo Fang ◽

Zhi-Yong Xu ◽

Zhao Zhao

Keyword(s):

Source Localization ◽

Likelihood Function ◽

Near Field ◽

Kernel Density ◽

Kernel Density Estimator ◽

Density Estimator ◽

Reverberant Environment

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Blind deconvolution approach for resolution enhancement of near-field microwave images

10.1117/12.351322 ◽

1999 ◽

Cited By ~ 4

Author(s):

Ali Mohammad-Djafari ◽

Nasser Qaddoumi ◽

Reza Zoughi

Keyword(s):

Blind Deconvolution ◽

Near Field ◽

Resolution Enhancement

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Wavelet-based blind deconvolution of near-field ultrasound scans

IET Image Processing ◽

10.1049/iet-ipr.2013.0791 ◽

2015 ◽

Vol 9 (8) ◽

pp. 672-679 ◽

Cited By ~ 1

Author(s):

Jason R.B. Taylor ◽

Gabriel Thomas ◽

Jose J. Mijares Chan

Keyword(s):

Blind Deconvolution ◽

Near Field

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Dual surface beamforming and acoustical holography for sound field visualization in reverberant environments

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1539 ◽

2009 ◽

Vol 224 (1) ◽

pp. 55-70 ◽

Cited By ~ 2

Author(s):

Yong Thung Cho ◽

M J Roan ◽

J Stuart Bolton

Keyword(s):

Near Field ◽

Sound Field ◽

Field Measurements ◽

Sound Waves ◽

Noise Sources ◽

Reflected Waves ◽

Reverberant Environments ◽

Reverberant Environment ◽

Reflecting Surface ◽

Acoustical Holography

Near-field acoustical holography is a technique that has been widely used to visualize noise sources from pressure measurements in spaces that can be assumed to be anechoic or semi-anechoic. Previously, a dual surface acoustical holography procedure based on making measurements on two surfaces between the source and a reflecting surface was introduced to remove the effects of reverberation. Little work has been performed in which beamforming has been used to visualize sources based on dual surface, near-field measurements in a reverberant environment: such a procedure is described here. Because many practical measurement environments are not completely anechoic, the source resolution accuracy of dual surface acoustical holography and beamforming procedures in reverberant environments is compared here by using numerical simulations. It has been found that dual surface acoustical holography provides the clearest representation of the source location when sound waves radiating from the source and the reflected waves are propagating in the opposite directions and when the measurement surfaces are conformal with the source geometry. However, it has also been found that dual surface beamforming provides more consistent source resolution performance regardless of the relative direction of wave propagation of the source and reflected waves.

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Near-field scanning optical microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144644 ◽

1986 ◽

Vol 44 ◽

pp. 642-643

Author(s):

E. Betzig ◽

A. Harootunian ◽

M. Isaacson ◽

A. Lewis

Keyword(s):

Near Field ◽

Optical Microscope ◽

Visible Radiation ◽

Field Methods ◽

Optical Elements ◽

Optical Region ◽

Order Of Magnitude ◽

Nondestructive Imaging ◽

Scanning Optical Microscopy ◽

Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

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