RU2001102779A - DEVICE AND METHOD FOR DETERMINING PHYSICAL PARAMETERS OF A TWO PHASE MIXTURE USING THE PROPAGATION OF THE ACOUSTIC WAVE IN A CONTINUOUS PHASE OF A TWO PHASE MIXTURE - Google Patents

Claims (1)

1. A device for measuring the propagation time of an acoustic wave in the continuous phase of a two-phase mixture (28) containing a continuous phase and a dispersed phase forming droplets (40) in a continuous phase, comprising: an electro-acoustic transducer (12) capable of generating acoustic waves (30 ) and create at the output a received signal of the reflected acoustic waves, and a means for using the converter signals, configured to determine the propagation time based on the signals generated by the forming, characterized in that the device further comprises means for focusing acoustic waves in the focusing area, and adjusting the frequency of acoustic waves for reflection waves from the dispersed phase droplets which are in the focusing area.  2. The device according to claim 1, characterized in that the focusing means comprises an acoustic lens (16) with a radiation surface (18).  3. The device according to claim 2, characterized in that the radiation surface (11, 111) of the acoustic lens comprises at least a concave part (18a, 118a) capable of focusing acoustic waves, and a flat part (18b, 118b) capable of reflect unfocused waves.  4. The device according to p. 3, characterized in that the acoustic lens contains a first piezoelectric element (112a) corresponding to the concave part (118a) of the radiation surface mounted on at least one second surface opposite and parallel to the surface (112a) radiation, and a second piezoelectric element (112b) corresponding to a flat surface (118b) of the radiation surface.  5. The device according to claim 4, characterized in that the lens further comprises a control optical device (150) connected to the second piezoelectric element (118b).  6. The device according to p. 3, characterized in that the acoustic lens contains a region made of a material (154) matching the impedance with a free, flat surface, which is made at the same level with the flat part of the radiation surface.  7. The device according to claim 6, characterized in that the impedance matching material is installed in the cavity (152) formed in the acoustic lens on the radiation surface.  8. The device according to p. 2, characterized in that the radiation surface contains an antireflection coating.  9. The device according to claim 2, characterized in that the means using the signal is configured to determine the delay time between the first signal (62) reflected from the radiation surface of the lens and the second signal (64) reflected from the droplet of the dispersed phase, which corresponds to the same radiated acoustic wave. 10. The device according to p. 1, characterized in that the means for using signals is configured to determine the velocity V _{c of the} propagation of an acoustic wave in a continuous phase using the equation

where F represents the focal length of the focusing means and T is the wave propagation time. 11. The device according to p. 2, characterized in that the means for using signals comprises means for measuring the amplitude of the signal reflected from at least one part of the radiation surface of the acoustic lens to determine the degree of reflection R _{c of the} continuous medium.  12. The device according to p. 1, characterized in that the means for using signals also includes means for measuring the amplitude of the signal reflected from the droplets of the dispersed phase to determine the degree of reflection between the continuous phase and the dispersed phase.  13. A method for determining the propagation parameters of an acoustic wave in a continuous phase by reflecting the acoustic wave from the target, characterized in that droplets (40) of the phase dispersed in the continuous phase are used as the target.  14. The method according to p. 13, characterized in that for determining the propagation parameters of an acoustic wave in a continuous phase in a two-phase mixture (28) containing a continuous phase and a dispersed phase formed as droplets (40) in a continuous phase, acoustic waves (30 ), focused in the focusing area, emit into a continuous phase, and the frequency of the acoustic wave is adjusted to create reflection on droplets of the dispersed phase, which are located approximately in the focusing area, record the first waveforms, reflect wife droplets, the propagation time of the wave is determined from the reflected signals, and the propagation velocity is calculated from the propagation time and taking into account the focusing distance of the acoustic wave. 15. The method according to p. 14, characterized in that they record the second reflected acoustic wave signals reflected from the interface between the acoustic lens of the electro-acoustic transducer and the continuous phase, and also determine the degree of reflection R _{c of the} continuous medium by measuring the amplitude of these second signals. 16. The method according to p. 15, characterized in that the acoustic impedance Z _{c of the} continuous phase is determined using the following equation:

where Z _L represents the acoustic impedance of the material of which the acoustic lens is made. 17. The method according to p. 16, characterized in that the pc density of the continuous phase is determined using the value of the acoustic impedance value Z _c and the propagation velocity of the acoustic wave using the equation

18. The method according to p. 14, characterized in that the degree of reflection Rd between the continuous phase and the dispersed phase is determined based on measuring the amplitude of the first reflected signals. 19. The method according to p. 16 or 18, characterized in that the acoustic impedance Zd of the dispersed phase can be determined using the following level: