Glossary of Terms

Acoustic Beam: Acoustic waves concentrated mainly in a limited direction.
Acoustic Center of a Transducer: The apparent center of the spherical waves in the far field of a transducer.
Acoustic Impedance: The complex ratio of acoustic pressure to amplitude of volume velocity.
Acoustic Medium: Any material through which acoustic waves can travel, usually air or water, but also other fluids and solids.
Acoustic Modem: Underwater device which communicates by means of acoustic waves.
Active Sonar: Detection of a target by projecting acoustic waves and listening for an echo, also called echo ranging.
Admittance, Y: 1) The reciprocal of the impedance, Z. 2) Y = G + jB where G is the conductance and B is the susceptance.
Antiresonance, f _a: 1) For an electric field transducer, the frequency at which the mass and open-circuit stiffness cancel or the frequency of maximum impedance or RVS. 2) For a magnetic field transducer, the frequency at which the mass and short-circuit stiffness cancel or the frequency of maximum admittance or TVR.
Armature: 1) Part of a magnetic circuit. 2) The moveable part of the magnetic circuit in a variable reluctance transducer.
Array of Transducers: Two or more transducers that are used together usually to achieve a higher intensity and narrower beam.
Astroid: 1) Hypocyloid of four cusps. 2) Described by a point on a small circle of radius, R, rolling around the inside of a larger circle of radius 4R.
Beam steering: Changing the principal direction of an acoustic beam by changing...

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Transducers and Arrays for Underwater Sound

TABLE OF CONTENTS

Glossary of Terms

A-C

Transducers and Arrays for Underwater Sound

TABLE OF CONTENTS

Glossary of Terms

A-C

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