Теория на навигационния ехолот. Блокова схема

Basic principles

• Sound
• Propagation of sound
• Frequency and wavelength
• Benefits of Ultrasound
• Measuring distance using echoes

Propagation of sound

.As the sides of the bell vibrate, they hit the air

molecules around the bell, pushing them outwards and then.

pulling them back in again. These molecules in turn have a

similar effect on their neighbours causing them to vibrate back

and forth at. the same rate as the sides of the bell.. By this

process vibrations from a sound source are transmitted in all

directions through a medium. Such vibrations move in the form

of waves, in much the same way that ripples in a pool radiate

out from where a stone has been dropped into it. When the

vibrations from a sound source reach our ears, we hear the

sound.

Echoes from small objects

Echoes from small objects

A small object such as a fish will not be detected