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In order to overcome the problem of poor accuracy of resonant interferometer method in the measurement of thermodynamic sound speed and hypersound speed of liquids an experimental setup for measuring the sound speed of liquids is established based on the principle of spontaneous Brillouin light scattering. A Fabry-Perot interferometer is used to filter the scattered light and a data acquisition card as well as a photon counting head is used to detect and analyze the scattered light, then a data acquisition and analysis method of scattered light is presented. This method overcomes the limitation of the signal distortion in conventional Brillouin light scattering and increases the measuring accuracy of the sound speed of liquids remarkably. The sound speed of saturated liquid CCl4 is measured in the frequency range of 308.6 to 906.2 MHz at 298.15 K. Results agree well with the data reported in the literature, and show that the experimental method is feasible. In addition, the method for measuring the ultrasonic speed is proposed by adding several free spectral ranges to the measured Brillouin frenquency-shift. The ultrasonic speed of CCl4 measured is in the frequency range of 5406.1–5521.0 MHz. It is shown that the thermodynamic sound speed does not change with the sound frequency, while the hypersound speed increases with the increase of sound frequency and it is much greater than the thermodynamic sound speed, which proves the dispersion phenomena of CCl4.
[1] He M G, Liu Z G 2002 Acta Phys. Sin. 51 1004 (in Chinese) [何茂刚, 刘志刚 2002 51 1004]
[2] Liu Q, Feng X J, Duan Y Y 2014 CIESC Journal 65 1162 (in Chinese) [刘强, 冯晓娟, 段远源 2014 化工学报 65 1162]
[3] Wilhelm E, Letcher T M 2010 Heat Capacities: Liquids, Solutions and Vapours (Cambridge:RSC Publishing) p185
[4] Zuckerwar A J 2002 Handbook of the Speed of Sound in Real Gases (Volume 1) (Amsterdam:Academic Press) p89
[5] Wang X F, Xiong X C, Gao M Z 2011 Acta Phys. Sin. 60 114303 (in Chinese) [王新峰, 熊显潮, 高敏忠 2011 60 114303]
[6] Herzfeld K F, Litovitz T A 1959 Absorption and Dispersion of Ultrasonic Waves (New York: Academic Press) p49
[7] Geng H Y, Wu Q, Tan H, Cai L C, Jing F Q 2002 Chin. Phys. 11 1188
[8] Liu K, Chen J S 2011 Chin. Phys. B 20 020501
[9] An B L, Liu Q, Duan Y Y 2012 J. Eng. Thermophys. 33 561 (in Chinese) [安保林, 刘强, 段远源 2012 工程热 33 561]
[10] Ball S J, Trusler J P M 2001 Int. J. Thermophys. 22 427
[11] Fröba A P, Krzeminski K, Leipertz A 2004 Int. J. Thermophys. 25 987
[12] Fröba A P, Botero C, Leipertz A 2006 Int. J. Thermophys. 27 1609
[13] Chu B 1991 Laser Light Scattering: Basic Principles and Practice (2nd Ed.) (New York: Academic Press) p22
[14] Mountain R D 1966 Rev. Mod. Phys. 38 205
[15] Takagi T, Sawada K, Urakawa H, Ueda M, Cibulka I 2004 J. Chem. Thermodyn. 36 659
[16] Bobik M, Niepmann R, Marius W J 1979 J. Chem. Thermodyn. 11 351
[17] Kalra C K, Singh C K, Spah C D 1994 J. Chem. Eng. Data 39 372
[18] Klyohara O, Arakawa K 1971 Bulletin of the Chemical Society of Japan 44 1224
[19] Narayana L K, Swamy M K 1989 J. Chem. Eng. Data 34 19
[20] Fort J R, Moore R W 1965 Transactions of the Faraday Society 61 2102
[21] Lagemann T R, Mcmillan R D, Woolf E W 1949 J. Chem. Phys. 17 369
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[1] He M G, Liu Z G 2002 Acta Phys. Sin. 51 1004 (in Chinese) [何茂刚, 刘志刚 2002 51 1004]
[2] Liu Q, Feng X J, Duan Y Y 2014 CIESC Journal 65 1162 (in Chinese) [刘强, 冯晓娟, 段远源 2014 化工学报 65 1162]
[3] Wilhelm E, Letcher T M 2010 Heat Capacities: Liquids, Solutions and Vapours (Cambridge:RSC Publishing) p185
[4] Zuckerwar A J 2002 Handbook of the Speed of Sound in Real Gases (Volume 1) (Amsterdam:Academic Press) p89
[5] Wang X F, Xiong X C, Gao M Z 2011 Acta Phys. Sin. 60 114303 (in Chinese) [王新峰, 熊显潮, 高敏忠 2011 60 114303]
[6] Herzfeld K F, Litovitz T A 1959 Absorption and Dispersion of Ultrasonic Waves (New York: Academic Press) p49
[7] Geng H Y, Wu Q, Tan H, Cai L C, Jing F Q 2002 Chin. Phys. 11 1188
[8] Liu K, Chen J S 2011 Chin. Phys. B 20 020501
[9] An B L, Liu Q, Duan Y Y 2012 J. Eng. Thermophys. 33 561 (in Chinese) [安保林, 刘强, 段远源 2012 工程热 33 561]
[10] Ball S J, Trusler J P M 2001 Int. J. Thermophys. 22 427
[11] Fröba A P, Krzeminski K, Leipertz A 2004 Int. J. Thermophys. 25 987
[12] Fröba A P, Botero C, Leipertz A 2006 Int. J. Thermophys. 27 1609
[13] Chu B 1991 Laser Light Scattering: Basic Principles and Practice (2nd Ed.) (New York: Academic Press) p22
[14] Mountain R D 1966 Rev. Mod. Phys. 38 205
[15] Takagi T, Sawada K, Urakawa H, Ueda M, Cibulka I 2004 J. Chem. Thermodyn. 36 659
[16] Bobik M, Niepmann R, Marius W J 1979 J. Chem. Thermodyn. 11 351
[17] Kalra C K, Singh C K, Spah C D 1994 J. Chem. Eng. Data 39 372
[18] Klyohara O, Arakawa K 1971 Bulletin of the Chemical Society of Japan 44 1224
[19] Narayana L K, Swamy M K 1989 J. Chem. Eng. Data 34 19
[20] Fort J R, Moore R W 1965 Transactions of the Faraday Society 61 2102
[21] Lagemann T R, Mcmillan R D, Woolf E W 1949 J. Chem. Phys. 17 369
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