Physical Oceanography, Vol.
AUTOMATION OF RESEARCH IN SEAS AND OCEANS
IST-1 AND IST-1M CURRENT-VELOCITY METERS
UNDER THE SEA AND RIVER CONDITIONS
N. A. Grekov
and A. N. Grekov
We present a critical analysis of the applied current-velocity meters produced by leading world compa-
nies and pose the problem of creation of a device meeting the contemporary requirements and guarantee-
ing the succession of the applied and newly developed procedures of measurements and data interpreta-
tion. A brief description of IST-1 and IST-1M devices developed at the Marine Hydrophysical Institute
of the Ukrainian Academy of Sciences and the algorithms of operation of their measuring channels is
presented. The metrological characteristics of the IST-1 device according to the data of the State Accep-
tance Tests and the results of evaluation of the reproducibility index for a pilot batch of these devices are
The currents of water masses in rivers, seas, and oceans are caused by various factors and have a quite com-
plicated character. The main parameters of the currents, i.e., their velocity and direction, are characterized by
the well-pronounced space-and-time variability. Therefore, the problem of measuring these parameters with the
help of contemporary measuring devices is rather difficult. The difficulties are connected not only with insuffi-
ciently perfect procedures of measuring current velocities but also with the fact that measuring devices are
poorly equipped with additional (auxiliary) measuring channels aimed at introducing corrections to the space
location of the device.
At present, numerous current-velocity meters are produced for operation under the sea and river conditions.
Depending on their primary transducers, they are classified as tachometric, electromagnetic, marking, thermo-
hydrometric, electrochemical, acoustic, flow-past meters, etc. .
Analysis of the Contemporary Current-Velocity Meters
We now analyze the characteristics of current-velocity meters produced by the leading world companies.
The main criteria of our analysis are the universal character of the device (the ability to operate under the sea
and river conditions) and the succession of the available methods of measurements and mounting of the devices
formed for decades.
The major part of the analyzed contemporary devices is based on the principle of the Doppler shift of the
frequency of acoustic signals. However, there are some exceptions, namely, the Valeport-106,- 108, and -308
Marine Hydrophysical Institute, Ukrainian National Academy of Sciences, Sevastopol, Ukraine.
Corresponding author; e-mail: firstname.lastname@example.org.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
77–84, March–April, 2010. Original article submitted February 5, 2009;
revision submitted March 31, 2009.
0928–5105/10/2002–0149 © 2010 Springer Science+Business Media, Inc. 149