Acoustic signature

acousticacousticalacousticscharacteristic soundsnoise
The term Acoustic signature is used to describe a combination of acoustic emissions of sound emitters, such as those of ships and submarines.wikipedia
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Naval mine

minesmineminesweeping
Modern naval mines and torpedoes such as the CAPTOR mine can be programmed to distinguish the acoustic signatures of different vessels, leaving friendly vessels unmolested and attacking high-value targets when faced with multiple possible targets, e.g. distinguishing an aircraft carrier from its escorts.
The fuses on such mines may incorporate one or more of the following sensors: magnetic, passive acoustic or water pressure displacement caused by the proximity of a vessel.

Torpedo

torpedoeshoming torpedotorpedoed
Modern naval mines and torpedoes such as the CAPTOR mine can be programmed to distinguish the acoustic signatures of different vessels, leaving friendly vessels unmolested and attacking high-value targets when faced with multiple possible targets, e.g. distinguishing an aircraft carrier from its escorts.
A ship's acoustic signature is not the only emission a torpedo can home in on: to engage U.S. supercarriers, the Soviet Union developed the 53–65 wake-homing torpedo.

Stealth ship

stealthstealth technologystealth boat
These techniques borrow from stealth aircraft technology, although some aspects such as wake and acoustic signature reduction (Acoustic quieting) are unique to stealth ships' design.

Diesel–electric transmission

diesel-electricdiesel electricElectric
Radiated mechanical noise would also be minimised by using propulsors powered by a diesel-electric power plant; with the diesels being placed in the superstructure to mechanically isolate them from the water.
This mechanically isolates the noisy engine compartment from the outer pressure hull and reduces the acoustic signature of the submarine when surfaced.

Teardrop hull

Albacore hullteardrophull
Benefits over previous types include increased underwater speed and a smaller acoustic signature, making detection by sonar more difficult.

Anechoic tile

anechoic tilesanechoic coatinganechoic plating
These were initially prone to falling off, but as the technology matured it was apparent that the tiles were having a dramatic effect in reducing the submarines' acoustic signatures.

Radar

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Similar methods have been used to identify aircraft, especially before the development of sophisticated radar tracking.

Ship class

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Therefore, different ship classes will have different combinations of acoustic signals that together form a unique signature.

Hydrophone

hydrophoneshydrophobicunderwater microphone
Hydrophones and sonar operating in passive mode can detect acoustic signals radiated by otherwise invisible submarines, and use these signals to target attacks.

Sonar

ASDICvariable depth sonaractive sonar
Hydrophones and sonar operating in passive mode can detect acoustic signals radiated by otherwise invisible submarines, and use these signals to target attacks. The analysis of acoustic signatures is an important adjunct to passive sonar used to track naval warships and weapons.

Mark 60 CAPTOR

CAPTOR mineMK60 minesMark 60 CAPTOR mines
Modern naval mines and torpedoes such as the CAPTOR mine can be programmed to distinguish the acoustic signatures of different vessels, leaving friendly vessels unmolested and attacking high-value targets when faced with multiple possible targets, e.g. distinguishing an aircraft carrier from its escorts.

High-value target

HVThigh-value targetsHVT Raids
Modern naval mines and torpedoes such as the CAPTOR mine can be programmed to distinguish the acoustic signatures of different vessels, leaving friendly vessels unmolested and attacking high-value targets when faced with multiple possible targets, e.g. distinguishing an aircraft carrier from its escorts.

Aircraft carrier

carrieraircraft carrierscarriers
Modern naval mines and torpedoes such as the CAPTOR mine can be programmed to distinguish the acoustic signatures of different vessels, leaving friendly vessels unmolested and attacking high-value targets when faced with multiple possible targets, e.g. distinguishing an aircraft carrier from its escorts.

Radar cross-section

radar cross sectionradar signatureRCS
Warship designers aim to reduce the acoustic signature of ships and submarines just as much as they aim to reduce the radar cross sections and infra-red signals.

Propulsor

Radiated mechanical noise would also be minimised by using propulsors powered by a diesel-electric power plant; with the diesels being placed in the superstructure to mechanically isolate them from the water.

Royal Navy

RNBritish NavyBritish Royal Navy
For a time the Royal Navy toyed with the idea of the trimaran hulled Future Surface Combatant.

Trimaran

trimaransdouble-outriggerdouble outrigger
For a time the Royal Navy toyed with the idea of the trimaran hulled Future Surface Combatant.

RV Triton

ACV ''TritonRV ''TritonAustralian Customs Vessel ''Triton
This project got as far as the construction of the research ship RV Triton to test the principle of a large scale trimaran design.