Transducer Properties and Utilization

  • Whitlow W.L. Au
  • Mardi C. Hastings
Part of the Modern Acoustics and Signal Processing book series (MASP)

Near and Far Acoustic Fields

In Chapter 2, we concentrated on the properties and behavior of the electroacoustic elements that are used to construct a transducer. In this chapter, we will consider the transducer as a whole, whether it is constructed with an array of elements or is made up of a single element. We will begin this chapter with a discussion of the acoustic near and far fields of a transducer. The concept of a near field is often difficult to grasp since many explanations are embroiled in mathematics that seem to confuse rather than to clarify the issue. In this section, a simple model will be used to discuss the notion of the near and far portion of an acoustic field generated by an acoustic radiator, in the hopes of giving the reader a physically intuitive understanding of the topic. This whole analysis is also applicable to a transducer used as a receiver.

Consider a circular disc of radius a shown in Fig. 3.1, and assume that there are two point...


Linear Array Acoustic Pressure Side Lobe Main Lobe Beam Pattern 
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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Hawaii Institute of Marine BiologyUniversity of HawaiiKaneoheUSA
  2. 2.Applied Research LaboratoryPenn State UniversityUSA

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