DEVELOPMENT OF IN SITU ACOUSTIC INSTRUMENTS FOR THE AQUATIC ENVIRONMENT STUDY

 A.N. Grekov, N.A. Grekov, E.N. Sychov, K.A. Kuzmin

Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

Email: ngrekov1@уаndex.ru

DOI: 10.33075/2220-5861-2019-2-22-29

UDK 551.46.08

Abstract:

     Based on the analysis of existing acoustic methods and instruments, a prototype of an automated instrument has been developed to perform joint measurements in situ of two parameters: sound speed and ultrasound attenuation. The device is based on existing sound velocity profilers. It was proposed to replace the TDC-GP22 converters used in the sound speed meter ISZ-1 with more advanced modern modified converters TDC-GP30, which can significantly improve the accuracy of measuring the amplitude of the reflected acoustic signal. The programs for processing signals from the primary acoustic transducer have been developed. The model of the device passed preliminary tests.

     Equipping sound velocity meters with an additional channel for determining sound absorption in water allows you to expand the set of primary information received by the device and explore the nature of sea water anomalies with their quantitative and qualitative assessment. The need for the accumulation of experimental material in terms of the propagation rate and attenuation of ultrasound is caused by the uncertainty of the limits of applicability of the empirical dependencies established for them.

     As a further development of a modified instrument with an additional measuring channel for monitoring ultrasound scattering, it is proposed to expand the operating frequency range of the instrument to 10 MHz, which will allow to study both the main components of the ultrasound attenuation process, and separately analyze the absorption spectrum of ultrasound.

Keywords: acoustic meters, sound speed, equations, ultrasound attenuation, sensors, transducers, natural waters, codes, scheme.

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