A.N. Grekov, N.A. Grekov, E.N. Sychov, K.A. Kuzmin
Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28
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.
LIST OF REFERENCES:
- Zhou, Qifa, Sienting Lau, Dawei Wu, and K. Kirk Shung. “Piezoelectric films for high frequency ultrasonic transducers in biomedical applications.” Progress in materials science56, no. 2 (2011): 139–174.
- Fisher F.H., Simmons V.P. Sound absorption in sea water // J. Acoust. Soc. Am. 62, 558–564 (1977).
- Mellen R.H., Simmons V.P., Browning D.G. Sound absorption in sea water: A third chemical relaxation // J. Acoust. Soc. Am. 65, 923–925 (1979).
- Fisher F.H., Simmons V.P. Sound absorption by a third chemical reaction // J. Acoust. Soc. Am. 65, 1327–1329 (1979).
- Kibblewhite A.C., Hampton L.D. A review of deep ocean sound attenuation data at very low frequencies // J. Acoust. Soc. Am. 67, 147–157 (1980).
- Pinkerton M.M. A pulse method for the measurement of ultrasonic Absorption in liquids: results for water // Nature. 160, 128 (1947).
- Leonard R.W. The attenuation of ultrasonic waves in water // J. Acoust. Soc. Am. 20, 224 (1948).
- Liebermann L. The origin of sound absorption in water and in sea water // J. Acoust. Soc. Am. 20, 868 (1948).
- Francois R.E., Garrison G.R. Sound absorption based on ocean measurements. Part I: Pure water and magnesium sulfate contributions // J. Acoust. Soc. Am. 72, 896–907 (1982).
- Francois R.E., Garrison G.R. Sound absorption based on ocean measurements. Part П: Boric acid contribution and equation for total absorption // J. Acoust. Soc. Am. 72, 1879–1890 (1982).
- Browning D.G., Mellen R.H. Attenuation of low-frequency sound in the sea: Recent results, in Progress in Underwater Acoustics, edited by H.M. Merklinger (Plenum, New York, 1987). P. 403–410.
- Skretting А., Leroy C.C. Sound Attenuation between 200 Hz and 10 kHz // J. Acoust. Soc. Am. 49, 276–282 (1970)
- Mellen R.H., Browning D.G. Variability of Low-Frequency Sound Absorption in the Ocean: pH Dependence // J. Acoust. Soc. Am. 61, 704–706 (1977).
- Garrison G.R., Early E.W., Wen T. Additional Sound Absorption Measurements in near-Freezing Sea Water // J. Acoust. Soc. Am. 59, 1278–1283 (1976).
- Grekov A. N., Grekov N. A., Sychev E. N. Using sound velocity profilographs to determine water density // Modern problems of ocean thermohydromechanics (SPTO-2017): materials of the First ISTC on ocean thermohydromechanics (Moscow, November 28-30, 2017). Moscow: IO RAS, 2017. P. 46–49.
- Grekov A. N., Grekov N. A., Shishkin Yu. E. Investigation of sound velocity Profiler characteristics and correction of measurement results // Monitoring systems of environment. 2017. Iss. 10 (30). P. 24–30.
- IOC, SCOR and I A PSO, 2010: The international thermodynamic equation of seawater – 2010: Calculation and use of thermodynamic properties. Intergovernmental Oceanographic Commission, Manuals and Guides No. 56, UNESCO (English), 196 p., available at: http://www.TEOS-10.org
- Del Grosso V.A., Mader С.W. Speed of sound in pure water // J. Acoust. Soc. Amer. 1972. Vol. 52. N 5. P. 1442–1446.
- Investigation of the dependence of sound velocity on pressure in distilled water / V. A. Belopolsky, S. S. Zakoyan, L. M. Samorukova [et al.] / / Measuring equipment. 1999. № 4. P. 66–69.
- Ultrasonic-Flow-Converter Data Sheet TDC-GP22 March 13th 2014 Document-No: DB_GP22_en V0.9 Universal 2-Channel Time-to-Digital Converters Dedicated to Ultrasonic Heat & Water Meters (Available at https://ams.com/documents/20143/36005/TDC-GP22_DS000323_1-00.pdf/aa6c41ca-1312-60ec-f6a8-82c90da3f856) (дата обращения: 03.06.2019).
- Jobst S., Rudolf B. A Comparison of Correlation and Zero-Crossing Based Techniques in Ultrasonic Measurements // In Proceedings of “Applied Research Conference 2014”, Ingolstadt, 2014. P. 362–267.
- Ultrasonic-Flow-Converter Data Sheet TDC-GP30 June 27th, 2019 Document-No: DB_GP30Y_Vol1_en V0.3 System-Integrated Solution for Ultrasonic Flow Meters Volume 1: General Data and Frontend Description (Available at https://ams.com/documents/20143/36005/TDC-GP30_DS000391_3-00.pdf/f96f8c8b-87e5-ac8d-a26c-65756fd240fa) (дата обращения: 03.06.2019).
- Grekov A.N., Grekov N.A., Sychov E.N. New Equations for Sea Water Density Calculation Based on Measurements of the Sound Speed // Mekhatronika, Avtomatizatsiya, Upravlenie. 2019. 20 (3). P. 143–151. https://doi.org/10.17587/mau.20.143-151
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