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An online measurement method of frequency-sweeping ultrasonic focused sediment particle size distribution

A particle size distribution and measurement method technology, which is applied in signal processing, sediment particle size technology, pattern recognition, ultrasonic liquid-solid two-phase flow measurement, can solve problems such as difficult particle size distribution measurement of suspended matter, and achieve good regional Adaptability, fast calculation and processing, and the effect of improving the signal-to-noise ratio

Active Publication Date: 2019-05-31
CHINA JILIANG UNIV
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Problems solved by technology

The complexity of the attenuation makes the general ultrasonic model unable to accurately describe, and the measurement of suspended particle size distribution (PSD) is very difficult

Method used

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  • An online measurement method of frequency-sweeping ultrasonic focused sediment particle size distribution

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Embodiment Construction

[0017] Attached below figure 1 The present invention is further described.

[0018] Build a set of measurement devices with a focused ultrasonic probe as the core. The ultrasonic focused online measurement and measurement device for river sediment concentration is composed of three modules: a signal generation module, an ultrasonic transducer module and a data acquisition module. The signal The generating module includes a signal generator and a power amplifier, the ultrasonic transducer module includes a focused ultrasonic transmitting probe and a focused ultrasonic receiving probe, and the data acquisition module includes a power amplifier and an oscilloscope. The initial signal sent by the signal generator needs to be adjusted, the frequency 5 is set to 400k, 600k, 800k, 1.0M, 1.13M, 1.3M, 1.5M and 1.7MHz in turn, the peak-to-peak value is 2Vpp, and the form is a burst wave. The power amplifiers are all set to 2.5 times as required. The sampling frequency of the oscillosc...

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Abstract

The invention discloses an on-line measurement method for frequency-sweeping ultrasonic focusing type sediment particle size distribution. The present invention builds a set of measuring devices with a focused ultrasonic probe as the core, and at the same time uses the screening method and microscope method to configure sediment samples of different particle sizes; debugs the measuring system, and starts the measuring device after it is accurate; changes the ultrasonic wave Frequency, a series of experiments with sediment particle size as a variable were carried out at different ultrasonic frequencies to obtain the data of the received waveform; phase space segmentation and symbol dynamic filtering based on the Hilbert transform were performed on the collected signals to obtain the same Measurement of parameter values ​​related to particle size; data fitting is performed on the scatter diagrams of measurement and sediment particle size at different frequencies to obtain a sediment particle size measurement model. The invention can effectively reduce the scattering attenuation in the propagation process, increase the acceptable sound energy at the receiving transducer, improve the signal-to-noise ratio, and the sensitivity and measurement accuracy of the entire measurement system.

Description

technical field [0001] The invention relates to the fields of ultrasonic liquid-solid two-phase flow measurement, signal processing, sediment particle size technology, and pattern recognition, in particular to a frequency-sweeping ultrasonic focused online measurement method for sediment particle size distribution. Background technique [0002] The problem of sediment particles in natural water bodies is related to water conservancy machinery, riparian agriculture, sea and land resources, and ecological environment. Accurate particle size measurement in liquids is critical in many areas of industrial production, including medical pharmaceuticals, energy transportation, and more. [0003] The traditional methods for measuring the particle size of suspended substances include weighing method, particle size meter method, pipette method, sieving method, extinction method and centrifugation method. The currently widely used particle measuring methods are: sieving method, microsc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
CPCG01N15/02
Inventor 谢代梁夏一丹安雅丽曹永刚徐志鹏
Owner CHINA JILIANG UNIV
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