TAMU OCEN 201 - underwater acoustics 2007 (31 pages)

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underwater acoustics 2007



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underwater acoustics 2007

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Lecture Notes


Pages:
31
School:
Texas A&M University
Course:
Ocen 201 - Intro To Ocean Engr
Intro To Ocean Engr Documents

Unformatted text preview:

Underwater Acoustics OCEN 201 TYPES OF UNDERWATER ACOUSTIC SYSTEMS z Active Sonar Systems Active echo ranging sonar is used by ships to locate submarine targets Depth sounders send short pulses downward and time the bottom return Side scan sonars are used for finding objects on sea floor and mapping Fish finding sonars are forward looking sonars for spotting fish schools Diver sonars are hand held sonars used for locating of underwater objects Position marking beacons transmit sound signal continuously Position marking transponders transmit sound only when interrogated Acoustic flow meters and wave height sensors are used Multiple beam echo sounders used to map the seafloor in great detail z Seismic Systems Subbottom profilers are used to explore the rocks and sediments making up the ocean floor The acoustic pulses used are basically unidirectional pressure pulses that are generated by air guns Results show the geological features below the ocean floor 2 SUBMARINE SONAR 3 TYPES OF UNDERWATER ACOUSTIC SYSTEMS 3 Underwater Communications and Telemetry Systems and Navigation a Underwater telephone is a device used to communicate between a surface ship and a submarine or between two submarines UQC b Diver communications diver has a full face mask which allows the diver to speak normally underwater and a throat microphone is used to obtain speech signals A transducer is used to transmit the signal The same transducer is used to receive and the signal is passed to the diver via an ear piece c Telemetry systems data from a submerged instrument is transmitted to the surface d Doppler navigation pairs of transducers pointing obliquely downward to obtain speed over the bottom from the Doppler shift of the bottom returns 4 TYPES OF UNDERWATER ACOUSTIC SYSTEMS 4 Passive Systems a Passive ship sonar is a hydrophone array that detects acoustic radiation from another vessel or object i e JP or JT hydrophone used by WWII submarines b Acoustic mines mines explode when acoustic



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