Accession Number : AD0004294


Title :   ESTUARINE CURRENT METER CONTRACT


Descriptive Note : Progress rept.


Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD INST FOR COOPERATIVE RESEARCH


Personal Author(s) : Miller, C F


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/004294.pdf


Report Date : 31 Jan 1953


Pagination or Media Count : 9


Abstract : An instrument is being developed for measuring accurately and recording continuously the velocity of the water at a fixed point in an estuary. The instrument must have a range of 0.05 to 3 knots and an accuracy of + or - 0. 05 ft/sec. It should be small and light and have no external moving parts requiring rotating or sliding bearings. The sensing element is to operate at depths of 200 ft. A survey of the literature was made, and 2 methods were studied: (1) a system for measuring the force exerted on a solid body submerged in the flow and (2) a system for measuring the difference in time taken by a sound wave to traverse a fixed distance in the direction of and against the current. The ulrasonic system is being designed to employ 2 crystal transducers separated by a path length of 26 in., which will alternately transmit and receive a 1-mc signal. The estuarine current meter will be attached to an anchor on the bottom of the estuary by a cable system.


Descriptors :   *FLOWMETERS , VELOCITY , LITERATURE SURVEYS , WATER , PATHS , ACCURACY , LENGTH , SLIDING , ESTUARIES , MECHANICAL COMPONENTS , SOLID BODIES , EXTERNAL , BEARINGS , SOUND WAVES , RANGE(DISTANCE) , ROTATION


Subject Categories : Hydrology, Limnology and Potamology


Distribution Statement : APPROVED FOR PUBLIC RELEASE