A method for measuring the acoustic reflection coefficient between liquid and solid retardation materials
A measurement method and acoustic reflection technology, which is applied in the fields of sensors, measurement, and ultrasonic waves, can solve problems such as direct determination of the amplitude, and achieve the effects of reducing variables, scientific steps, and reducing the amount of calculation
Active Publication Date: 2020-04-14
DALIAN UNIV OF TECH
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At this time R 12 According to A SS / A 0 get, but a 0 The amplitude of can not be directly determined in the echo signal, so the method needs to be perfected
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[0042] The present invention relates to a method for measuring the acoustic reflection coefficient between a liquid and a solid delay material when ultrasonic waves are used to measure liquid density. The method of the present invention will be further described through specific implementation cases below.
[0043] This embodiment discloses a method for measuring the acoustic reflection coefficient between a liquid and a solid delay material, the steps of which are as follows:
[0044] Step 1: Determine the driving signal
[0045] Select the center frequency of the transducer drive signal from the waveform generator as 1MHz, the peak-to-peak value as 10V, and the number of cycles as 30.
[0046] Step 2: Select the half-wave layer
[0047] In the present invention, select quartz glass as the half-wave layer material, its advantage is: 1) well-known its acoustic characteristic, 2) attenuation coefficient is lower under the high frequency, 3) have suitable acoustic impedance, ma...
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Abstract
The present invention discloses a method for measuring the acoustic reflection coefficient between a liquid and a solid delaying material. The method comprises: arranging a thin solid as a half-wave layer in the middle of a measured liquid; respectively and symmetrically placing an ultrasonic transducer A and an ultrasonic transducer B on both sides of the measured liquid, wherein the ultrasonic transducer A as a transmitting transducer works in a pulse echo mode, and the ultrasonic transducer B works in a receiving mode; and adjusting the driving frequency of the ultrasonic transducer A to make the multiple reflection waves of ultrasonic waves achieve the interference to the maximal degree at the measured liquid and half-wave layer interface, such that the echo signals of the ultrasonic transducer A and the ultrasonic transducer B tend to steady states, and the acoustic reflection coefficient R12 between the measured liquid and the half-wave layer is only related to the amplitude ratio K of the echo signals of the ultrasonic transducer A and the ultrasonic transducer B in the steady state. With the method of the present invention, the theoretical derivation process of the reflection coefficient measurement is simplified.
Description
technical field [0001] The invention relates to the technical fields of ultrasonic waves, sensors, measurement and the like, and relates to a method for measuring the acoustic reflection coefficient between a liquid and a solid delay material when ultrasonic waves are used to measure liquid density. Background technique [0002] Acoustic resistance method to measure liquid density is mainly obtained by using acoustic characteristic impedance Z=ρc, where Z is acoustic impedance, ρ is liquid density, and c is ultrasonic propagation speed. When the ultrasonic wave is vertically incident on the medium 2 from the medium 1, set A i 、A t and A r are the amplitudes of the incident, transmitted and reflected waves, respectively. According to the theory of plane wave propagation, the sound pressure reflection coefficient R from medium 1 to medium 2 12 with acoustic impedance Z 1 and Z 2 The relationship is: [0003] [0004] Assuming that the density ρ of the medium 1 is kno...
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IPC IPC(8): G01N29/48
CPCG01N29/4418G01N29/48G01N2291/02818G01N2291/044
Inventor 李国锋李晓佳王进君王志强王宁会
Owner DALIAN UNIV OF TECH