Sonars & Underwater Acoustics

Informationen zum Autor Jean-Paul Marage is currently retired from his main activities as an electronic engineer. He has formerly held positions as a CNAM electronic engineer; an Ecole Supérieure d'Electricité engineer for SUPELEC Paris; and was Manager, for 25 years, of the Research and development laboratory at Thales Underwater Systems, Sophia Antipolis, France. He also worked as an acoustic and electronic sonar system expert for 5 years and a CNAM (Conservatoire National des Arts et Métiers) teacher in electronics for 25 years. Yvon Mori , Consultant, France. Although retired from his main activities as an electronic engineer, he is still Chairman of the SEE French Riviera (Société de l'Electricité, de l'Electronique et des Technologies de l'Information et de la Communication) and the IEEE in France. He is also a COFRAC Auditor for programme 38 and trains engineers in mechanical vibration, shock analysis and electromagnetic compatibility for major companies. Before retirement he was, for 37 years, the manager of the environmental test and evaluation laboratory at Thales Underwater Systems in Sophia Antipolis, France. Klappentext Sonar and Underwater Acoustics brings together all the concepts necessary for designers and users of sonar systems. Unlike other books on this subject, which are often too specialized, this book is accessible to a wider audience. The first part focuses on the acoustic environment, antenna structures, and electric acoustic interface. The latter provides knowledge required to design, as well as the development and implementation of chain processes for an active sonar from the conditioning input to output processing. The reader will find a comprehensive range of all problems encountered in underwater acoustics for a sonar application, from physical phenomena governing the environment and the corresponding constraints, through to the technical definition of transducers and antennas, and the types of signal processing involved. In one section, measures in underwater acoustics are also proposed. Zusammenfassung Sonar and Underwater Acoustics brings together all the concepts necessary for designers and users of sonar systems. Unlike other books on this subject, which are often too specialized, this book is accessible to a wider audience. The first part focuses on the acoustic environment, antenna structures, and electric acoustic interface. Inhaltsverzeichnis Preface ix PART 1. THE MARINE ENVIRONMENT 1 Part 1. Introduction 3 Chapter 1. Problematics 5 1.1. History 5 1.2. Underwater acoustics 7 1.3. Applications 9 1.4. Comparison with radar 10 1.5. Submarine detection and warfare 11 1.6. Submarine detection 11 1.7. Submarine detection: a veritable challenge 12 1.8. Overcoming the effects of the ocean 13 1.9. Sonar and information processing 16 Chapter 2. Sound Propagation in the Marine Environment 19 2.1. General points 19 2.2. Characteristics of the marine environment 19 2.3. Models used 22 2.4. Propagation phenomena 28 2.5. Application examples 33 Chapter 3. Noises and Reverberation 41 3.1. Classification of ambient noises 41 3.2. Analysis of noise sources 45 3.3. Wenz' model of sea noise 51 3.4. Directivity of sea noise 52 3.5. Reverberation 55 Chapter 4. Radiated and Inherent Noises 65 4.1. Radiated noise 65 Chapter 5. Transmission of the Acoustic Signal: Sonar Equations 79 5.1. Introduction 79 5.2. Detection contrast and detection index 80 5.3. Transmission equation 81 5.4. Equation of passive sonar 88 5.5. Equation of active sonar 89 PART 2. ACOUSTIC-ELECTRIC INTERFACE ANTENNA STRUCTURES 93 Part 2. Introduction 95 Chapter 6. El...

List of contents

Preface ix

PART 1. THE MARINE ENVIRONMENT 1

Part 1. Introduction 3

Chapter 1. Problematics 5

1.1. History 5

1.2. Underwater acoustics 7

1.3. Applications 9

1.4. Comparison with radar 10

1.5. Submarine detection and warfare 11

1.6. Submarine detection 11

1.7. Submarine detection: a veritable challenge 12

1.8. Overcoming the effects of the ocean 13

1.9. Sonar and information processing 16

Chapter 2. Sound Propagation in the Marine Environment19

2.1. General points 19

2.2. Characteristics of the marine environment 19

2.3. Models used 22

2.4. Propagation phenomena 28

2.5. Application examples 33

Chapter 3. Noises and Reverberation 41

3.1. Classification of ambient noises 41

3.2. Analysis of noise sources 45

3.3. Wenz' model of sea noise 51

3.4. Directivity of sea noise 52

3.5. Reverberation 55

Chapter 4. Radiated and Inherent Noises 65

4.1. Radiated noise 65

Chapter 5. Transmission of the Acoustic Signal: SonarEquations 79

5.1. Introduction 79

5.2. Detection contrast and detection index 80

5.3. Transmission equation 81

5.4. Equation of passive sonar 88

5.5. Equation of active sonar 89

PART 2. ACOUSTIC-ELECTRIC INTERFACE ANTENNA STRUCTURES93

Part 2. Introduction 95

Chapter 6. Electric-acoustic and Acoustic-electricTransformations 97

6.1. Transducers and hydrophones 97

Chapter 7. Performance and Structures of Acoustic Antennas113

7.1. Antennas and radiation 113

7.2. Structures of sources and antennas 189

Chapter 8. Electronic Transducer-hydrophone Adaptation211

8.1. Hydrophones 211

8.2. Transducers 243

Chapter 9. Electro-mechano-acoustic Analogies 269

9.1. Methods of studying transducers and hydrophones 269

9.2. Mechanic-electric equivalence 270

9.3. Electric-acoustic equivalence 275

9.4. Finite element method (FEM) 320

PART 3. PROCESSING CHAIN OF ACTIVE SONAR 323

Part 3. Introduction 325

Chapter 10. Selection Criteria in Active Processing327

10.1. Selection criteria related to propagation 327

10.2. Selection criteria relative to noise 331

10.3. Selection criteria related to reverberation 332

10.4. Selection criteria related to emission power 333

10.5. Selection criteria related to the antenna 335

10.6. Selection criteria for the operating frequency 336

10.7. Selection criteria related to operational considerations337

10.8. Selection criteria related to the nature of targets337

Chapter 11. Processing Chain in Active Sonar 341

11.1. General points 341

11.2. Emission 341

11.3. Reception 345

Chapter 12. Basic Theoretical Notions in Active Processing459

12.1. The Doppler effect 459

12.2. The Doppler effect in active sonar conditions 464

12.3. Treatment of the signal 485

12.4. Choice of an emission signal under active sonar conditions503

Chapter 13. Measurement in Underwater Acoustics 525

13.1. Introduction 525

13.2. Wave train method 531

13.3. Precautions before measuring 539

13.4. Acoustic measurements and calibrations of transducers542

13.5. Notion of uncertainty estimation and of maximum tolerateddifference 551

13.6. Other types of measurements in underwater acoustics553

APPENDICES 555

Appendix 1. Logarithmic Scales 557

Appendix 2. Equation of Sound in Fluids 563

Appendix 3. Piezoelectricity Fundamentals 571

Appendix 4. Vector Analysis ?Ï?nFundamentals 579

Appendix 5. Reciprocity Theorem 593

Appendix 6. Concrete Example of Uncertainty Estimation Based onthe Reciprocity Calibration Method 601

Bibliography 619

Index 623

Product details

• Authors: MARAGE, Jean-Pau Marage, Jean-Paul Marage, Yvon Mori
• Publisher: Wiley, John and Sons Ltd
• Languages: English
• Product format: Hardback
• Released: 01.09.2010
• EAN: 9781848211896
• ISBN: 978-1-84821-189-6
• No. of pages: 608
• Series: ISTE; ISTE
• Subjects: Natural sciences, medicine, IT, technology; Schallschutz, Bauingenieur- u. Bauwesen, Civil Engineering & Construction, Hydrologie im Bauwesen, Hydrology (Civil Engineering), Sound Protection Engineering