Sonar > TL - Spreading > Flashcards

TL - Spreading Flashcards

(7 cards)

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1
Q

Define ‘Transmission Loss”

A

Reduction in signal strength due to spreading and absorption.

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2
Q

Spreading

A

Geometrical spraeding of the wave

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3
Q

Absorption

A

Water molecules which are moved by the acoustic wave experience a change in kinetic energy which is then dissipated as heat.

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4
Q

Scattering

A

inhomogeneity in water causing direction change. Eg. bubbles, temperature change.

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5
Q

Spherical spreading formula

A
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6
Q

Cylindrical Spreading formula

A
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7
Q

What is mixed spreading and what is the formula

A

There will be a portion which is spherical and portion which is cyllindrical.

r_0 = transition distance

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