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
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