Topic 4: Echo Sounder and Speed Logs: According to your Knowledge, answer the following questions: a. In Echo...

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Physics

Topic 4: Echo Sounder and Speed Logs:
According to your Knowledge, answer the followingquestions:
a. In Echo sounder systems some devices has one transducer(transmitting and receiving transducer
in one unit) and the other devices has two transducers whichof them is better and why?
b. The factors that affect the Velocity of Sonic &ultrasonic Wave in Seawater are Salinity, Pressure and Temperature;explain with aid of drawing and equation their effect on themeasurement depth indicated by an echo sounder?
c. Explain how to cancel out the effects of pitching androlling on the speed indicated by Doppler Speed Log (JanusConfiguration); Support your answer by drawing and equations?
d. The using of DGPS offers improve fix accuracy, over whatrange and frequency would you expect to receive local area DGPS(LAD) data?

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4.3 Ratings (549 Votes)

A A transducer can be described as an energy converter during transmission its input is electrical and its output is acoustic for perception the input is acoustic and the output electrical It is normal to use only one transducer for both transmission and reception But the effectiveness is higher for two transducers one for receiving and other for transmitting This will help in avoiding disturbance while sending or receiving signals If we are using one transduced there is a change of disturbance or interference Using multiple transducers can rectify the problem B Salinity A change of salinity will cause a small corresponding change in density See Answer

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