A Low-flow Velocity Sonar Measurement Method, And Its Device And Application

nostract 01u escriptions A low-flow velocity sonar measurement method, and its device and application, which is characterized by utilizing a sonar sensor to measure the sound generated by the vibration of the double electric layer on the solid-liquid interface of the porous medium, and then amplify and convert the measured acoustical signal to obtain the flow velocity of liquid existed in the porous medium. The present invention created a new passive measurement method by means of "low-flow velocity seismo-electric sonar seepage" based upon the integration of the "double electric layer seismo-electric theory" and the "measurement method by means of sonar seepage". The lower limit of such measurement method can reach 10-8cm/s, or even lower. The creation of this measurement method is likely to address all key technical issues occurred in the micro-seepage engineering that need to be solved urgently, which constitutes the purpose of the present invention. drawings o 1escripions Adsorpt ion Layer Diffusion 1Layer Figure 2 Size of Particle Size of Pore Double Electric Streaming Current = Layer M M M M Seismo-electric Effect Size of Pore Low-velocity Seismo-electric Sonar Measurement Figure 3 n /7