The Design and Performance of a Free-Fall Electro-Magnetic Velocity Profiler (EMVP).
Abstract
The principles of operation, the construction and the performance are described for a free-fall Electro-Magnetic Velocity Profiler (EMVP). The device measures and records weak electric currents produced by the motion of the sea through the geomagnetic field. The electric current measurements as a function of depth are interpreted in terms of the depth variable, horizontal velocity field. A complete velocity profile in 6000 m of water is achieved in about 1 1/2 hours with an accuracy of about 1 cm/s at a vertical resolution of 10 m. In addition to velocity, temperature, electrical conductivity and pressure are recorded once per second for a vertical resolution of about 1 m. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1974
- Accession Number
- AD0786315
Entities
People
- John H. Dunlap
- Robert G. Drever
- Thomas B. Sanford
Organizations
- Woods Hole Oceanographic Institution