Timothy K. Stanton - Storming Media

Acoustic Scattering Classification of Zooplankton and Microstructure

09 OCT 2003

Authors: Timothy K. Stanton; Peter H. Wiebe; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

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The long-term goals of this research were to understand the acoustic reverberation properties of zooplankton and microstructure and to apply these models, along with advanced instrumentation, to further our understanding of biological and physical processes in coastal and open ocean areas. The approach involved a combination of laboratory and in situ measurements of scattering by individual zooplankton, development of acoustic scattering models, development of broadband physics-based classification and signal processing ...

Acoustic Scattering by Axisymmetric Finite-Length Bodies: An Extension of a 2-Dimensional Conformal Mapping Method

10 OCT 2002

Authors: D. B. Reeder; Timothy K. Stanton; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING

A general scattering formulation is presented for predicting the far- field scattered pressure from irregular, axisymmetric, finite length bodies for three bound- ary conditions-soft, rigid and fluid. The formulation is an extension of a two dimensional conformal mapping approach D. T. DiPerna and T. K. Stanton, J. Acoust. Soc. Am. 96: 30643079 (1994) to scattering by finite length bodies. This extended formulation, which is inherently numerically efficient to evaluate, involves ...

Broadband Acoustic Backscatter and High-Resolution Morphology of Fish: Measurement and Modeling

2002

Authors: D. B. Reeder; J. M. Jech; Timothy K. Stanton; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Remote detection and classification of marine organisms require accurate acoustic scattering models that adequately incorporate organism morphology. Broadband acoustic backscattering measurements, advanced high- resolution imaging of fish morphology using CT scans and phase contrast x-rays (in addition to traditional x-rays), and associated scattering modeling using the images have been conducted involving alewife (Alosa Pseudoharengus), a swimbladder-bearing fish. A greater-than-octave bandwidth (40-95 kHz), shaped, linearly swept, frequency modulated signal was used ...

Inference of Fish Orientation From Broadband Acoustic Echoes

2001

Authors: Timothy K. Stanton; D. B. Reeder; J. M. Jech; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF APPLIED OCEAN PHYSICS AND ENGINEERING

A new method has been developed for inferring orientation of fish through the use of broadband acoustic signals. The method takes advantage of the small range resolution possessed by these signals, once temporally compressed through a cross-correlation process. The temporal resolution of these compressed signals is inversely proportional to the bandwidth, thus the greater the bandwidth, the finer the resolution. This process has been applied to broadband chirp signals spanning ...

Ray Solutions to Sound Scattering by Complex Bodies: Application to Zooplankton

14 FEB 2000

Authors: Timothy K. Stanton; Dezhang Chu; Peter H. Wiebe; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Acoustic surveys of zooplankton in the freshwater and marine environments result in echograms displaying spatial patterns of volume scattering strength and sometimes target strength data. A crucial element to the interpretation of the data is understanding the acoustic scattering properties of the individual animals. Because of the complexity of the boundary conditions of the animals, approximate scattering models have been developed. In this paper, laboratory ...

Model-Based Covariance Mean Variance Classification Techniques: Algorithm Development and Application to the Acoustic Classification of Zooplankton

24 NOV 1998

Authors: Linda V. Traykovski; Timothy K. Stanton; Peter H. Wiebe; James F. Lynch; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

For inversion problems in which the theoretical relationship between observed data and model parameters is well characters, a promising approach to the classification problem is the application of techniques that capitalize on the predictive power of class-specific models. Theoretical models have been developed for three zooplankton scattering classes (hard elastic-shelled, e.g., pteropods; fluid-like, e.g., euphauslids; and gas-bearing, e.g., siphonophores), providing a sound basis for model-based classification approaches. The Covariance Mean ...

A High Performance Towed Platform for Bio-Optical, Acoustical and Physical Data Acquisition

05 AUG 1997

Authors: Peter H. Wiebe; Timothy K. Stanton; Tom Austin; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF OCEAN ENGINEERING

We have purchased the component instruments and assembled them in a custom towed body for acquisition of high frequency acoustics data, high frame rate video data, and environmental data. The system, BIOMAPER II, operates using a fiber optic telemetry unit and a cable with 3-glass fibers at ship speeds up to 10 kts. The cable, winch, and slip rings together with a shipping van are included as part of the ...

Development of Advanced Volume Scattering Instrumentation. A Bottom Moored and Drifting Bioacoustic Sensing Platform and Relay

30 JUN 95

Authors: Peter H. Wiebe; Timothy K. Stanton; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF BIOLOGY

The long range goal of this project has been to develop acoustical techniques and instruments for the measurement and analysis of the spatial and temporal structure of oceanic and neritic zooplankton and micronekton populations. In this particular effort, we refined, tested, and evaluated an existing prototype autonomous active acoustic system (the BIOacoustic Sensing Platform And Relay - BIOSPAR) for observation of high frequency (120 and 420 kHz) acoustic backscattering. The ...

Boundary Conditions and Sound Scattering Models for Various Zooplankton

JUN 94

Authors: Timothy K. Stanton; Dezhang Chu; Peter Wiebe; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Echosounders are widely used in the remote detection and classification of marine organisms such as zooplankton. In order to interpret the data, accurate acoustic scattering models must be used. Zooplankton present a formidable challenge when attempting to describe their scattering properties. These animals come in many sizes, shapes, and material properties. The animals can be divided into several major categories of gross anatomical groupings; fluid like or weak scatterers, bodies ...

Laboratory Studies of Acoustic Scattering from the Underside of Sea Ice

Authors: Timothy K. Stanton; Clarence S. Clay; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

We made substantial progress in this contract contributing to new understandings of the acoustic properties of sea ice. We observed important dependences of acoustic properties of sea ice upon ice type and environmental conditions which was a result of our careful measurements of ice morphology that were concurrent with the acoustic measurements. As a result of our studies, we formulated semi-empirical acoustic models of the water/ice interface that can be ...