John C. Cochran - Introduction to Sonar Transducer Design

The text is divided into five chapters. The first chapter explores the physics of the acoustic medium outside of the transducer. Since the purpose of a transducer is to generate sound in the water, we must understand the parameters that impact the design of the transducer and its ability to produce acoustic power.

Chapter twobegins the development of transducer theory by developing equivalent circuits for simple mechanical and acoustical systems. These principles can sometimes be applied to transducer design but more generally lead to a physical understanding of how a mechanical/acoustical transducer works.

Chapter threeaddresses acoustic waves in solids. In this chapter, we specifically develop the theory for sound propagation in solids that will ultimately impact the design of the transducer. A transducer is a solid device through which acoustic energy flows. We must understand the propagation of acoustic energy in solids in order to design transducers. The chapter starts off with acoustic waves in non‐piezo‐electric solids and then moves into a thorough discussion of waves in piezo‐electric solids. Piezo‐electricity is reviewed to the point that it is applicable to transducer design.

Chapter fourdiscusses projectors. This chapter brings together elements from the first three chapters. Tools and limitations to projector design are reviewed.

Chapter fivediscusses hydrophones. Sensor self‐noise and its impact on system design are thoroughly discussed in this chapter.

Enjoy.

John C. Cochran, PhD

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