Acoustic sensor array for sonic imaging in air

Turqueti, Marcos; Kunin, V. N.; Cardoso, Bill; Saniie, Jafar; Oruklu, Erdal

doi:10.1109/ultsym.2010.5935842

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…One application of this acquisition system is the sound source separation using the Independent Component Analysis (ICA) technique [48]. The same authors propose in [50] the use of beamforming, matched filtering, spectral processing, and ICA for imaging, tracking and identification of objects. In both applications, the main tasks of the FPGA are the formatting and transmission of the recovered audio streams to a desktop Personal Computer (PC) through an Ethernet link.…”

Section: Fpga-based Audio Acquisition Systemsmentioning

confidence: 99%

FPGA-Based Architectures for Acoustic Beamforming with Microphone Arrays: Trends, Challenges and Research Opportunities

2018

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Over the past decades, many systems composed of arrays of microphones have been developed to satisfy the quality demanded by acoustic applications. Such microphone arrays are sound acquisition systems composed of multiple microphones used to sample the sound field with spatial diversity. The relatively recent adoption of Field-Programmable Gate Arrays (FPGAs) to manage the audio data samples and to perform the signal processing operations such as filtering or beamforming has lead to customizable architectures able to satisfy the most demanding computational, power or performance acoustic applications. The presented work provides an overview of the current FPGA-based architectures and how FPGAs are exploited for different acoustic applications. Current trends on the use of this technology, pending challenges and open research opportunities on the use of FPGAs for acoustic applications using microphone arrays are presented and discussed.

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Section: Fpga-based Audio Acquisition Systemsmentioning

confidence: 99%

FPGA-Based Architectures for Acoustic Beamforming with Microphone Arrays: Trends, Challenges and Research Opportunities

2018

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“…It is only in the far-field that wavelength determines resolution, which is, however, at the order of the transducer size and independent of wavelength in the near-field regime. Recent development in other single imaging methods is trying to achieve improved imaging quality and better detectability, e.g., sonic imaging is used for detecting defects or hidden objects inside the structure [ 1 ], thermal imaging methods proved capable of mapping the length and shape of cracks and provides qualitative information about crack depth [ 2 ]. In order to find a way to improve the imaging capability of each single imaging technique and to reach beyond the physical diffraction limit, the multi-wave imaging concept was proposed in recent years [ 3 – 6 ], which consists of combining two different waves that were generated sequentially and taking advantage of the merit of each wave.…”

Section: Introductionmentioning

confidence: 99%

Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health Monitoring

Cheng

Deng

Cao

et al. 2013

Sensors

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In this article, the state-of-the-art multi-wave and hybrid imaging techniques in the field of nondestructive evaluation and structural health monitoring were comprehensively reviewed. A new direction for assessment and health monitoring of various structures by capitalizing the advantages of those imaging methods was discussed. Although sharing similar system configurations, the imaging physics and principles of multi-wave phenomena and hybrid imaging methods are inherently different. After a brief introduction of nondestructive evaluation (NDE), structure health monitoring (SHM) and their related challenges, several recent advances that have significantly extended imaging methods from laboratory development into practical applications were summarized, followed by conclusions and discussion on future directions.

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“…Apart from these systems also widely deployed are sonar-rings [12] and acoustic imaging systems. Acoustic imaging systems typically require a large number of receivers and are based on acoustic beam-forming [13,14] or holography [15]. This work has evolved from two different sensor configurations developed at our group.…”

Section: Introductionmentioning

confidence: 99%

An accurate compact ultrasonic 3D sensor using broadband impulses requiring no initial calibration

Walter

Schweinzer

2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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A compact 3D ultrasonic sensor for scene analysis is presented in this paper. A centered transmitter emits a broadband ultrasonic impulse which is reflected by obstacles in the environment. Reflected waves, if propagated back to the sensor, are then received by four identical ultrasonic microphones. These signals are used to provide polar-and azimuth information based on time difference of arrival and in addition, by using a novel method presented in this paper, sub wavelength accurate distance measurements are possible as well. The used algorithm does not rely on the actual shape of the signal but only on its statistical properties. This is a great achievement because commercially available broadband ultrasonic transducers are typically piston membrane types which exhibit a strong frequency dependent radiation pattern. If measurements are performed outside of the main lobe, not only the signal amplitude is greatly reduced requiring algorithms capable of dealing with a low SNR but also the phase of the signal is affected yielding simple pulse compression techniques useless. The article includes a description of the problem, a comparison to existing systems, a theoretical treatment of the system configuration and experimental results demonstrating the performance of our sensor.

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Acoustic sensor array for sonic imaging in air

Cited by 6 publications

References 3 publications

FPGA-Based Architectures for Acoustic Beamforming with Microphone Arrays: Trends, Challenges and Research Opportunities

FPGA-Based Architectures for Acoustic Beamforming with Microphone Arrays: Trends, Challenges and Research Opportunities

Multi-Wave and Hybrid Imaging Techniques: A New Direction for Nondestructive Testing and Structural Health Monitoring

An accurate compact ultrasonic 3D sensor using broadband impulses requiring no initial calibration

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