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Echosounding
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth (coordinate), depth of water (bathymetry). It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight, along with knowledge of the speed of sound in water, allows determining the distance between sonar and target. This information is then typically used for navigation purposes or in order to obtain depths for Nautical chart, charting purposes. Echo sounding can also be used for ranging to other targets, such as fish schools. Hydroacoustic assessments have traditionally employed mobile surveys from boats to evaluate fish biomass and spatial distributions. Conversely, fixed-location techniques use stationary transducers to monitor passing fish. The word ''Depth sounding, sounding'' is used for all types of depth measurements, including those that don't use sound, and is unrelated in origin t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbert Grove Dorsey
Herbert Grove Dorsey (April 24, 1876 – 1961) was an American engineer, inventor and physicist. He was principal engineer of the United States Coast and Geodetic Survey Radiosonic Laboratory in the 1930s. He invented the first practical fathometer, a water depth measuring instrument for ships. Early life Dorsey was born in Kirkersville, Ohio on April 24, 1876. His parents were Edwin Jackson and Mary Elma (Grove) Dorsey. Family On June 21, 1900, Dorsey married Virginia Rowlett in Palmetto, Florida. Their children were Herbert Grove, Jr. and William Rowlett. Education Dorsey received a Bachelor of Science degree from Johns Hopkins University in 1897. He did post-graduate work at Hopkins in 1897 and received a Master of Science honorary degree from Denison University in 1898. He did post-graduate work at Harvard University in 1900–1901 and earned a Ph. D. from Cornell University in 1908. Societies He was a member of Beta Theta Pi. Career Dorsey taught physics at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
