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Table of Contents
Intro
Preface by Vladimir A. Shchurov: From Publication in Russian, 2019 (Translated from the Russian)
Acknowledgements
From the Editor of Publication in Russian, 2019 (Translated from the Russian)
Contents
1 Vector Representation of the Acoustic Field
1.1 Introduction
1.2 Scalar and Vector Characteristics of the Acoustic Field
1.3 Differential Phase Relationships in Complex Acoustic Vector Fields
1.4 Instantaneous and Average Acoustic Intensity
1.5 Auto- and Cross-Spectral Energy Densities
1.6 Frequency Coherence Function
1.7 Complex Intensity Vector
1.8 Temporal Coherence Function
1.9 Fourth Statistical Moment of Acoustic Intensity
1.10 Conclusions
References
2 Theory and Technique of Vector-Phase Underwater Acoustic Measurements
2.1 Introduction
2.2 Necessity and Sufficiency of the Vector-Phase Approach in Acoustics
2.3 Principle of Measuring the Sound Particle Velocity in an Acoustic Wave
2.4 Vector Acoustic Receiver
2.4.1 Basic Specifications for a Vector Receiver
2.4.2 Piezoceramic and Electrodynamic Vector Receivers
2.5 Combined Acoustic Receiver
2.6 Combined Underwater Acoustic Receiving Systems
2.6.1 Features of Acoustic Measurements in the Ocean
2.6.2 Bottom-Mounted Combined Receiving Systems
2.6.3 Free-Drifting Combined Telemetry Systems
2.6.4 Features of Vector Receiver Suspension in Free-Drifting Receiving Systems
2.6.5 Vector Receiver Systems on Unmanned Underwater Vehicles (Gliders)
2.7 Counterparts Outside Russia
2.8 Units of Measurement and Relative Levels of Measured Values
2.9 Conclusions
References
3 Phenomenon of Compensation of Intensities of Reciprocal Energy Fluxes
3.1 Introduction
3.2 Experimental Observations of Intensity Compensation
3.2.1 Design of Experiment in the Deep Open Ocean
3.2.2 Example of Vertical Compensation of Tone Signal and Underwater Ambient Noise Along the Z Axis
3.2.3 Example of Horizontal Compensation in the Shallow Water Waveguide
3.3 Compensation of Intensity Over a Broadband of Signal and Dynamic Underwater Acoustic Noise in the Deep Open Ocean
3.3.1 Experimental Setup and Technique
3.3.2 Research Results
3.4 Conclusions
References
4 Vortices of Acoustic Intensity Vector in the Shallow Water Waveguide
4.1 Introduction
4.2 Fundamental Relationships
4.2.1 Acoustic Pressure, Particle Velocity, Intensity Vector
4.2.2 Vector-Phase Characteristics of the Acoustic Field
4.2.3 Energy Streamlines
4.2.4 Vortex Generation Mechanism
4.3 Vortex Structure of the Interference Field in a Shallow Water Waveguide
4.3.1 Mathematical Processing of Vector Acoustic Signal
4.3.2 Modes and Vortices
4.4 Dynamics of Local Vortices
4.4.1 Properties of the Vector Field in the Region of Destructive Interference
4.4.2 Vortex of the Acoustic Intensity Vector as a Real Physical Object
4.5 Conclusions
References
Preface by Vladimir A. Shchurov: From Publication in Russian, 2019 (Translated from the Russian)
Acknowledgements
From the Editor of Publication in Russian, 2019 (Translated from the Russian)
Contents
1 Vector Representation of the Acoustic Field
1.1 Introduction
1.2 Scalar and Vector Characteristics of the Acoustic Field
1.3 Differential Phase Relationships in Complex Acoustic Vector Fields
1.4 Instantaneous and Average Acoustic Intensity
1.5 Auto- and Cross-Spectral Energy Densities
1.6 Frequency Coherence Function
1.7 Complex Intensity Vector
1.8 Temporal Coherence Function
1.9 Fourth Statistical Moment of Acoustic Intensity
1.10 Conclusions
References
2 Theory and Technique of Vector-Phase Underwater Acoustic Measurements
2.1 Introduction
2.2 Necessity and Sufficiency of the Vector-Phase Approach in Acoustics
2.3 Principle of Measuring the Sound Particle Velocity in an Acoustic Wave
2.4 Vector Acoustic Receiver
2.4.1 Basic Specifications for a Vector Receiver
2.4.2 Piezoceramic and Electrodynamic Vector Receivers
2.5 Combined Acoustic Receiver
2.6 Combined Underwater Acoustic Receiving Systems
2.6.1 Features of Acoustic Measurements in the Ocean
2.6.2 Bottom-Mounted Combined Receiving Systems
2.6.3 Free-Drifting Combined Telemetry Systems
2.6.4 Features of Vector Receiver Suspension in Free-Drifting Receiving Systems
2.6.5 Vector Receiver Systems on Unmanned Underwater Vehicles (Gliders)
2.7 Counterparts Outside Russia
2.8 Units of Measurement and Relative Levels of Measured Values
2.9 Conclusions
References
3 Phenomenon of Compensation of Intensities of Reciprocal Energy Fluxes
3.1 Introduction
3.2 Experimental Observations of Intensity Compensation
3.2.1 Design of Experiment in the Deep Open Ocean
3.2.2 Example of Vertical Compensation of Tone Signal and Underwater Ambient Noise Along the Z Axis
3.2.3 Example of Horizontal Compensation in the Shallow Water Waveguide
3.3 Compensation of Intensity Over a Broadband of Signal and Dynamic Underwater Acoustic Noise in the Deep Open Ocean
3.3.1 Experimental Setup and Technique
3.3.2 Research Results
3.4 Conclusions
References
4 Vortices of Acoustic Intensity Vector in the Shallow Water Waveguide
4.1 Introduction
4.2 Fundamental Relationships
4.2.1 Acoustic Pressure, Particle Velocity, Intensity Vector
4.2.2 Vector-Phase Characteristics of the Acoustic Field
4.2.3 Energy Streamlines
4.2.4 Vortex Generation Mechanism
4.3 Vortex Structure of the Interference Field in a Shallow Water Waveguide
4.3.1 Mathematical Processing of Vector Acoustic Signal
4.3.2 Modes and Vortices
4.4 Dynamics of Local Vortices
4.4.1 Properties of the Vector Field in the Region of Destructive Interference
4.4.2 Vortex of the Acoustic Intensity Vector as a Real Physical Object
4.5 Conclusions
References