List of Figures

• Figure 1 - Acoustic Lense Types
• Figure 2 - Lens System Overview: Hybrid Approach
• Figure 3 - Ray Tracing Terms
• Figure 4 - The Huygens-Fresnel Principle
• Figure 5 - Lens Geometry for Integration Method
• Figure 6 - Lens Geometry for Summation Method
• Figure 7 - Beam Pattern without Aliasing
• Figure 8 - Aliased Beam Pattern
• Figure 9 - CALC_LENS Block Diagram
• Figure 10 - Secondary Principal Point Determination
• Figure 11 - Orientation Examples
• Figure 5.1 - 200 kHz Diver-Held Sonar Lens
• Figure 5.2 - 300 kHz Autonomous Underwater Vehicle Lens
• Figure 5.3a - 100 kHz Surveillance Sonar Lens
• Figure 5.3b - Trial A: Focal Depth Results
• Figure 5.3c - Trial D: Focal Depth Results
• Figure 5.4.1a - 3 dB Contour Plot of Trial A: 100 kHz, 6.1 degrees C
• Figure 5.4.1b - 3 dB Contour Plot of Trial A: 100 kHz, 20 degrees C
• Figure 5.4.2a - 3 dB Contour Plot of Trial A: 300 kHz, 6.1 degrees C
• Figure 5.4.2b - Effect of Frequency on Beam Patterns
• Figure 5.4.2c - 3 dB Contour Plot of Trial A: 300 kHz, 20 degrees C
• Figure 5.4.3a - Effect of Element Size on Axial Response
• Figure 5.4.3b - Effect of Element Size on Beam Patterns
• Figure 5.4.5 - Effect of Aperture Size on Beam Patterns
• Figure 5.5a - Thin Lens System with Focal Trajectory
• Figure 5.5b - Beam Pattern for On-Axis Point Source
• Figure 5.5c - Beam Pattern for 25 degrees Off-Axis Point Source

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