Time domain visualization using acoustic holography implemented by temporal and spatial complex envelope

Park, Choon-Su; Kim, Yang-Hann

doi:10.1121/1.3203919

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…9,10 Other ways of displaying time dependent holographic measurements have been proposed. 18 Figure 1 is the top view of the bistatic configuration of the transducer, target, and the receiver array that were immersed at the same depth in the 3.6 m diameter water tank. A four panel piezo-composite transducer 9 centered at the source position ðs 1 ; s 2 Þ was driven by a single cycle of a 300 kHz sinusoidal wave.…”

Section: Methods Of Constructing the Acoustic Imagementioning

confidence: 99%

Acoustic quasi-holographic images of scattering by vertical cylinders from one-dimensional bistatic scans

Baik

Dudley

Marston

2011

The Journal of the Acoustical Society of America

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When synthetic aperture sonar (SAS) is used to image elastic targets in water, subtle features can be present in the images associated with the dynamical response of the target being viewed. In an effort to improve the understanding of such responses, as well as to explore alternative image processing methods, a laboratory-based system was developed in which targets were illuminated by a transient acoustic source, and bistatic responses were recorded by scanning a hydrophone along a rail system. Images were constructed using a relatively conventional bistatic SAS algorithm and were compared with images based on supersonic holography. The holographic method is a simplification of one previously used to view the time evolution of a target's response [Hefner and Marston, ARLO 2, 55-60 (2001)]. In the holographic method, the space-time evolution of the scattering was used to construct a two-dimensional image with cross range and time as coordinates. Various features for vertically hung cylindrical targets were interpreted using high frequency ray theory. This includes contributions from guided surface elastic waves, as well as transmitted-wave features and specular reflection.

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Section: Methods Of Constructing the Acoustic Imagementioning

confidence: 99%

Acoustic quasi-holographic images of scattering by vertical cylinders from one-dimensional bistatic scans

Baik

Dudley

Marston

2011

The Journal of the Acoustical Society of America

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“…Equations (23) and (24) represent two alternative expressions for the localization of sound source. In these two expressions, the variables are array distance L and slopes k 1 and k 2 .…”

Section: Localization Principlementioning

confidence: 99%

“…Far-field measurements of a moving source can be achieved by the short-time beamforming method, but these require extensive computational resources for processing the acquired data for the acoustic plane frame at every moment. The false noise source (ghost image) would also be easily generated [23,24]. For array signal processing, the required computations are fast and can be performed to high precision [25,26].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Localization for a Moving Source Based on Cross Array Azimuth

2018

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Acoustic localization for a moving source plays a key role in engineering applications, such as wildlife conservation and health protection. Acoustic detection methods provide an alternative to traditional radar and infrared detection methods. Here, an acoustic locating method of array signal processing based on intersecting azimuth lines of two arrays is introduced. The locating algorithm and the precision simulation of a single array shows that such a single array has good azimuth precision and bad range estimation. Once another array of the same type is added, the moving acoustic source can be located precisely by intersecting azimuth lines. A low-speed vehicle is used as the simulated moving source for the locating experiments. The length selection of short correlation and moving path compensation are studied in the experiments. All results show that the proposed novel method locates the moving sound source with high precision (<5%), while requiring fewer instruments than current methods.

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“…Short-Time Beamforming. Short beamforming method is based on the "delay accumulate" beamforming signal superimposed principle [12,13]. For the reconstruction of the surface at points, the period of its reconstruction [ 1 , 2 ] sound pressure signal within the principle is shown in Figure 1.…”

Section: Acoustical Holography Far-field Sound Source Identification mentioning

confidence: 99%

Optimization of Fixed Microphone Array in High Speed Train Noises Identification Based on Far-Field Acoustic Holography

Wang

Bei

2017

Advances in Acoustics and Vibration

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Acoustical holography has been widely applied for noise sources location and sound field measurement. Performance of the microphones array directly determines the sound source recognition method. Therefore, research is very important to the performance of the microphone array, its array of applications, selection, and how to design instructive. In this paper, based on acoustic holography moving sound source identification theory, the optimization method is applied in design of the microphone array, we select the main side lobe ratio and the main lobe area as the optimization objective function and then put the optimization method use in the sound source identification based on holography, and finally we designed this paper to optimize microphone array and compare the original array of equally spaced array with optimization results; by analyzing the optimization results and objectives, we get that the array can be achieved which is optimized not only to reduce the microphone but also to change objective function results, while improving the far-field acoustic holography resolving effect. Validation experiments have showed that the optimization method is suitable for high speed trains sound source identification microphone array optimization.

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Time domain visualization using acoustic holography implemented by temporal and spatial complex envelope

Cited by 9 publications

References 9 publications

Acoustic quasi-holographic images of scattering by vertical cylinders from one-dimensional bistatic scans

Acoustic quasi-holographic images of scattering by vertical cylinders from one-dimensional bistatic scans

Acoustic Localization for a Moving Source Based on Cross Array Azimuth

Optimization of Fixed Microphone Array in High Speed Train Noises Identification Based on Far-Field Acoustic Holography

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