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Sound Energy: Sonar

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Giacinta Miuccia

on 25 November 2013

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Transcript of Sound Energy: Sonar

Sound Energy:

designed by Péter Puklus for Prezi
Te property of matter and radiation that is manifest as a capacity to perform work
Such as causing motions and so on...
Where do sound come from?
It's created by elements, by audible pressures in the air, for example: our voice and its vocal cords.
They can be formed from molecules compressed and decompressed
Why Sonar?
Sonar is a good example on how sound waves work
It gives great evidence about how frequencies work
It also has a disadvantage that can be modified for an improvement
Development and Modification
Compare and
Vibrations that travel through air and can be heard when it reaches a persons ear
Sound Waves
They can relate!
The plan is to combine the two types (Side-scan and Multibeam) into one
The reason is to make it more effective and can detect things faster
But there are dangerous impacts
Side scan sonar is a specialized system for detecting objects on the seafloor.
Multibeam sonar transducer typically uses the Mills Cross telescope array. The sound is transmitted from transducers that are perpendicular.
Ideal Condition
Humans can only hear 20 – 20.000Hz (no higher or lower)
b.    Has 3 Characteristic (the higher the pitch/wave, the lower the wavelength)
c.    Sound can only travel through water, air or solid
i.    Sound travel with waves
d.     If sound hits a surface it will bounce off
e.    Soft surfaces can absorb sound
f.    Hard Surfaces will make sound bounce back (like an echo)
Uses of energy
Has 3 characteristics:
i.    Frequency: the rate at which something occurs or is repeated over a particular period of time or in a given sample.
1.    The higher the pitch, the shorter the wavelength
ii.    Amplitude: a measurement that indicates the movement or vibration of something (such as a sound wave or a radio wave)
1.    Amplitude determined the volume/loudness of the sound
iii.    Wavelength
1.    the distance between successive crests of a wave, esp. points in a sound wave or electromagnetic wave.
a.    The longer the wavelength, the shorter the pitch/volume of the sound
SONAR is short for Sound Navigation and Ranging. It detects the depth or the surrounding area of the sea using the phenomenon echo, where sound waves reflect back to the sender.

–    Side-Scan SONAR: To detect objects in the surrounding area
–    Multibeam SONAR: To measure the depth of the sea by calculating the time
–    First it sends out sound waves by using active SONAR
–    When the sound waves hit the sea surface, it will reflect back to the sender
–    Passive SONAR will listen and receive the sound waves
–    The sound waves will be translated into the desired result using a computer
Ideal Condition
•    Not interfering with marine life because SONAR could disturb the function of echolocation and change the behaviour
•    Can produce clear and precise picture of the surrounding area (Side-Scan SONAR)
•    Can measure the depth of the sea with precise measurements (Multibeam SONAR)
•    Sound waves can issue enough energy to get the desired results (Active SONAR)
•    Can receive the reflected sound waves and use them to get effective results (Passive SONAR)
Actual Condition
•    Disturbs marine life by disturbing their echolocation and changing their behaviour
•    Side-Scan SONAR cannot always get the precise picture of the surrounding area
•    Sometimes Multibeam SONAR cannot get the right measurement depending on the frequency that is used. Low frequency for shallow water, high frequency for deep water.
•    Have not used sound waves effectively by having been unable to always producing the right result
Sonars and Speakers
Function: To create an output from another device (such as a computer)
How it Works: Change electrical impulses to audible sound using a magnet and a coil

They produce sound waves and use it to their advantage

Ultrasound and Sonars
They both has the same technique or way to scan but Ultrasound focus more on scanning an inside of a human body. They relate because the use a high frequency and has a display to show the result of scanning
Both produce sound that
can't be heard by humans
and can be known as a scanner
Microphone and Sonar
The diaphragm. This is a thin piece of material (such as paper, plastic or aluminium) which vibrates when it is struck by sound waves.
When the diaphragm vibrates, it causes other components in the microphone to vibrate. These vibrations are converted into an electrical current which becomes the audio signal.
Note: At the other end of the audio chain, the loudspeaker is also a transducer - it converts the electrical energy back into acoustical energy.
The combine the two types of sonar which is Multibeam and Side-scan to make it more effective
Purpose and Benefit
To make sonar work more effectively
Get more knowledge on how sonar work
Understanding the process
How sound is produced
Can get more knowledge about sonar...
Ammar, Gia, Putri, Rafael, Emir, Bill
Full transcript