TL - Spreading Flashcards
1
Q
Define ‘Transmission Loss”
A
Reduction in signal strength due to spreading and absorption.
2
Q
Spreading
A
Geometrical spraeding of the wave
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.
4
Q
Scattering
A
inhomogeneity in water causing direction change. Eg. bubbles, temperature change.
5
Q
Spherical spreading formula
A
6
Q
Cylindrical Spreading formula
A
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
