0
Side-scan sonar is designed to provide detailed images of the seafloor and objects in the water column by scanning a wide swath to the sides of the sonar device. Traditional sonar, on the other hand, typically provides a single beam that measures the depth directly below the device. Side-scan sonar is often used for underwater mapping and search operations, while ordinary sonar is more commonly used for depth sounding and navigation.
What else can I help you with?
What are the differences in the sonars that you use?
When first discussing profilers with the uninitiated, there is sometimes some confusion as to how they differ from an imaging scanning sonar or a sidescan sonar. First of all, let's look at the difference between a scanning sonar and a sidescan sonar. With a scanning sonar, a small transducer emitting thousands of ultra sonic audio pulses per second is rotated about an axis using a small motor to drive it. The transducer rotates around an axis much as a lighthouse lamp rotates. In contrast, a sidescan sonar has a fixed transducer which also emits thousands of pulses per second but its movement is a linear one generated by towing the transducer through the water rather then an angular movement achieved with a motor. Next we must differentiate between an imaging sonar and a profiling sonar. Imaging sonars are typically used to provide an image of the seabed or water column much as a radar does on land. They provide a multicolored ('chromatic') display which shows stronger echo returns as brighter colors than points with weaker echos. E.g. you may get a bright yellow image from a strong return off of the side of a steel shipwreck and dark blue image off of the weak return from a smooth sand bed. A profiling sonar on the other hand provides a digitized version of the echo returns. The sonar's processor looks at the return signal for each pulse and decides where along that pulse's return time lays the strongest return. Rather than providing an analog range of colors for each pulse it provides a single dot or x,y point at the point of strongest return. Another differentiating factor between imaging and profiling sonars is the shape of the transducers beam pattern. An imaging sonar is typically a fan beam whereas the profiler emits a beam pattern like a spot or pencil beam. The imaging sonar fan beam (typically around half power +/-15 deg from horizontal) is configured to ensure that all targets above and below horizontal are detected while retaining an angular resolution (about 1.7 deg). The profiler on the other hand is a very specific tool for performing engineering measurements. Its spot or pencil beam (half power about 1.7deg from both horizontal and angular rotation) means that it is able to provide high resolution measurements both in terms of the horizontal plane and of angular displacement around its motor axis. OK, so what does all this mean to you? When we are inspecting a pipeline, our profiler takes very specific measurements of the internal dimensions of the pipe at that location. Not an average over the fan beam as it would be if we used and imaging sonar. The profiler then provides us with either a series of digitized "dots" in a screen shot (as in figure below) or it can save those thousands of digitized points as an ASCII file which can then be imported into CAD software for post processing. If combined with the recorded penetration depth we now have the necessary x,y,z points required to build a 3D model of the pipe (x & Y from the profiler and z from the umbilical counter). Once input to CAD, such parameters as volume of sedimentation or percentage restriction in pipe can be calculated. If you would like a further, more detailed description of sonar theory, Imagenex provide an excellent summary on their website imagenex.com.
When was the sonar invented by Lewis Nixon?
Lewis Nixon did not invent sonar. Sonar was actually invented by Reginald Fessenden in 1913. Sonar stands for sound navigation and ranging, which is a technique that uses sound propagation to navigate, communicate with, or detect objects underwater.
Will using sonar kill you?
No, using sonar will not kill you. Sonar is a technology that uses sound waves to detect objects underwater and is commonly used in various applications such as navigation and fishing. It is safe for humans to use sonar equipment.
What does the letters in sonar stand for?
SONAR = SOund Navigation And Ranging SONAR = Symantec Online Network for Advanced Response SONAR =Switch On No Activity Received SONAR = SOlar Near-surface Active-region Rendering Hope I helped.
What were the two different types of sonar?
The two types of sonar are active and passive.Active sonar uses a transmitter, a device that converts electrical energy to sound energy, to send out sound waves. The sound waves travel through the water until they strike an object. The object reflects them in various directions. Some of the reflected waves return to the sonar, where they strike a receiver. Sonar determines distances by measuring the time taken for a sound wave to travel from the transmitter, reflect from the object, and travel to the receiver.Passive sonar receives sound waves given off by some other source, but does not transmit sounds. Passive sonar can therefore determine the direction of an object, but is not as effective as active sonar in determining its distance.Hope I cleared your doubt!- Harman Kahlon
What is the definition for sidescan sonar?
is a category of sonar system that is used to efficiently create an image of large areas of the sea floor.
How does the information gathered by ships using Sea Beam sonar differ from that collected with standard methods that use one sonar device?
A sonar uses one device and a sea beam uses a dozen sonar devices.
How does the information gathered by ships using sea beam sonar differ from the collected with standard methods that use one sonar device?
A sonar uses one device and a sea beam uses a dozen sonar devices.
What technology do scientist use only to measure ocean depth?
Scientists primarily use sonar technology to measure ocean depth. Sonar, which stands for Sound Navigation and Ranging, emits sound waves from a ship or submarine that bounce off the ocean floor and return to the source. By calculating the time it takes for the sound waves to return, scientists can determine the depth of the water. Additionally, multibeam and sidescan sonar systems provide detailed bathymetric maps of the seafloor.
What was used to map mid ocean ridges?
Sonar. Early plumb-line depth-soundings and cable-laying may have picked up on parts of the ridges, but it needed full mapping to reveal what's really down there. Initially by echo-sounding, now also by sidescan-sonar that produces TV-like false-colour images of swathes of the sea floor and its features.
Which method of studying the ocean floor gives some degree of proximity but is efficient in terms of time as well?
sonar sonar sonar sonar SONAR
Which method of studying the ocean floors gives some degree of proximity but is efficient in terms of time as well?
sonar sonar sonar sonar SONAR
Which is more expensive a boat with sonar or a satellite with sonar?
sattelite with sonar
What do bats have sonar or radar?
Sonar
Do bats have sonar or radar?
Sonar
What is the full word for sonar?
sonar
What are the differences in the sonars that you use?
When first discussing profilers with the uninitiated, there is sometimes some confusion as to how they differ from an imaging scanning sonar or a sidescan sonar. First of all, let's look at the difference between a scanning sonar and a sidescan sonar. With a scanning sonar, a small transducer emitting thousands of ultra sonic audio pulses per second is rotated about an axis using a small motor to drive it. The transducer rotates around an axis much as a lighthouse lamp rotates. In contrast, a sidescan sonar has a fixed transducer which also emits thousands of pulses per second but its movement is a linear one generated by towing the transducer through the water rather then an angular movement achieved with a motor. Next we must differentiate between an imaging sonar and a profiling sonar. Imaging sonars are typically used to provide an image of the seabed or water column much as a radar does on land. They provide a multicolored ('chromatic') display which shows stronger echo returns as brighter colors than points with weaker echos. E.g. you may get a bright yellow image from a strong return off of the side of a steel shipwreck and dark blue image off of the weak return from a smooth sand bed. A profiling sonar on the other hand provides a digitized version of the echo returns. The sonar's processor looks at the return signal for each pulse and decides where along that pulse's return time lays the strongest return. Rather than providing an analog range of colors for each pulse it provides a single dot or x,y point at the point of strongest return. Another differentiating factor between imaging and profiling sonars is the shape of the transducers beam pattern. An imaging sonar is typically a fan beam whereas the profiler emits a beam pattern like a spot or pencil beam. The imaging sonar fan beam (typically around half power +/-15 deg from horizontal) is configured to ensure that all targets above and below horizontal are detected while retaining an angular resolution (about 1.7 deg). The profiler on the other hand is a very specific tool for performing engineering measurements. Its spot or pencil beam (half power about 1.7deg from both horizontal and angular rotation) means that it is able to provide high resolution measurements both in terms of the horizontal plane and of angular displacement around its motor axis. OK, so what does all this mean to you? When we are inspecting a pipeline, our profiler takes very specific measurements of the internal dimensions of the pipe at that location. Not an average over the fan beam as it would be if we used and imaging sonar. The profiler then provides us with either a series of digitized "dots" in a screen shot (as in figure below) or it can save those thousands of digitized points as an ASCII file which can then be imported into CAD software for post processing. If combined with the recorded penetration depth we now have the necessary x,y,z points required to build a 3D model of the pipe (x & Y from the profiler and z from the umbilical counter). Once input to CAD, such parameters as volume of sedimentation or percentage restriction in pipe can be calculated. If you would like a further, more detailed description of sonar theory, Imagenex provide an excellent summary on their website imagenex.com.
