Sediment particle size detection device and method based on fluid-solid interface wave

Abstract

The invention discloses sand grain diameter detection device and method based on a fluid / solid interface wave. Ultrasonic detection is applied to the detection of river sand grain diameter, Scholte wave energy is mainly focused in a fluid near a fluid / solid interface, and has the characteristics of largest amplitude, small frequency dispersion and high detection precision, the detection device is characterized in that a singlechip intelligent control module generates a pulse signal, an excitation signal generating module transmits the pulse signal in multiple paths of Scholte waves, a receiving module receives the corresponding Scholte waves, the signal is transmitted to the singlechip intelligent control module for performing calculation to obtain a relation graph between a number of the Scholte waves and the grain diameter, and a defect in existing grain diameter detection is well made up; the detection device has the advantages of small size, convenience in use, wide detection range to the grain diameter and high reliability, is easy to carry, is suitable for detection of the field river sand grain diameter detection, and is beneficial to the actual popularization and use.

Description

technical field [0001] The invention relates to a sediment particle size detection device and method based on fluid-solid interface waves, and belongs to the technical field of ultrasonic detection and analysis. Background technique [0002] The problems caused by river sedimentation involve the life of the reservoir, the inundation of the reservoir area, the evolution of the waterway at the tail section of the reservoir, the evolution of the port area, the normal operation of the ship lock in the dam area, and the normal operation of the power station, as well as the erosion of the riverbed downstream of the hub, the lowering of the water level, and the evolution of the river channel. At present, there are mainly the following methods for detecting the particle size of sediment particles in rivers: [0003] (1) Screening method: select sieves of different sieve sizes, arrange the sieves from small to large from top to bottom, and then put the sample to be tested on the top ...

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Problems solved by technology

[0006] (4) Electromagnetic induction method: also known as the Coulter method, the particle size is measured according to the resistance change of the particles suspended in the electrolyte when they flow through the orifice. The lower limit of the instrument measurement is affected by the background noise, and the particle size cannot be too large. When the particle size is too large, it will settle in the electrolyte and cause missed measurement, making the measurement result inaccurate;

[0008] According to the above method, although the particle size can be measured, there are shortcomings such as narrow measurement range, high lower limit, long measurement time, and inability to detect online, and the accuracy is low, which cannot meet the required accuracy. Engineering Testing Requirements

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