CONTENTS 
Introduction 
Lecture 1 
Lecture 2 
The Scientific Program Sponsored by NATO 
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TRANSDUCERS 
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1.2 Electroacoustic Conversion Principles ... 
1.3 Equivalent Electrical Circuits......... 
1.4 Electromechanical Coupling Factor ..... 
1.5 Transducer Materials .............. 
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1.6.3 Electromechanical Coupling Coefficient..... 
1.6.4 Power-Handling Capabilities ...... 
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SONAR ARRAYS, SYSTEMS, AND DISPLAYS 
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2.2 Arrays and Directionality............ 
2.2.1 Multiplicative Arrays........... 
2.2.2 Superdirective Arrays .......... 
2.2.3 Multifrequency Two-Element Arrays 
2.2.4 Wide-Band Arrays............. 
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2.3.1 Within-Pulse Scanning Systems Using 
Multielement Arrays ........... 
2.3.2 Within-Pulse Scanning Systems Using 
Multifrequency Arrays .......... 
2.3.3 Double-Transducer FM System .... 
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2.4.1 Integration and Correlation ....... 
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A2 
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