Single-frequency ultrasonic suspended load measurement system and method based on piezoelectric composite wafer

Abstract

The invention provides a single-frequency ultrasonic suspended load measurement system and method based on a piezoelectric composite wafer. The system comprises a measurement probe, data acquisition equipment, data transmission equipment and a user side which are connected in sequence; the measurement probe comprises a shell, a rectifying block installed on the shell, a transmitting wafer and an annular receiving wafer, and the transmitting wafer and the annular receiving wafer are integrally assembled on the rectifying block; the data acquisition equipment is used for receiving scattered echoes of the ultrasonic waves, amplifying the scattered echoes and converting the amplified scattered echoes into scattered data; and the user side is used for carrying out digital signal processing on the scattered data to obtain sound intensity information, carrying out superposition calculation on the amplitude of the effective section of the scattering echo signal through time domain analysis, and carrying out inversion to obtain the sediment concentration. The piezoelectric composite material is used for river sediment measurement for the first time, the signal-to-noise ratio and the signalemission frequency can be improved, the size of the composite piezoelectric wafer is small, the appearance structure of the probe can be miniaturized, the blind area of measurement can be reduced, andthe precision can be improved.

Description

technical field [0001] The invention relates to the technical field of river sediment detection, in particular to a single-frequency ultrasonic suspended mass measurement system and method based on piezoelectric composite wafers. Background technique [0002] The concentration and gradation of suspended sediment in natural rivers are important hydrological and environmental parameters. The movement coupling between water flow and sediment affects each other. Existing methods for measuring the concentration of suspended sediment include: sampling analysis method, optical detection method, acoustic detection method, image observation method, etc. [0003] The traditional mode of sampling in the field and analyzing in the laboratory is still continuing. Although the measurement accuracy is high, this method of sediment concentration measurement is relatively backward, time-consuming and labor-intensive. Optical detection methods use optical means to measure the concentration a...

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Problems solved by technology

[0005] Based on the principle of backscattering, ADV and ADCP and other equipment measure the concentration of suspended sand in water by analyzing the scattering characteristics of natural sediment particles, but the distance from the probe to the detection body is relatively long, and the longer the ultrasonic propagation distance, the signal will be affected on the propagation path. The attenuation of the effect of sand concentration is greater than the scattering signal of the sand concentration at the measuring point, so it is difficult to obtain useful information. Therefore, the range of sand concentration measurement is 0.1-3kg / m3, and due to the single-frequency working mode, the particle size cannot be realized. measure of distribution

[0006] There are certain deficiencies in the above-mentioned measurement equipment and measurement methods, and the limiting factors are mainly: the measurement of sand concentration cannot cover both low and high concentrations; there is no stable and reliable on-site real-time sand concentration measurement equipment; most of the equipment cannot realize Simultaneous measurement of concentration and gradation

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