On-line measurement method for sweep-frequency ultrasonic focusing type sediment grain size distribution

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

Active Publication Date: 2017-05-10
CHINA JILIANG UNIV
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Problems solved by technology

The complexity of the attenuation makes the general ultrasonic model unable to accurately d

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  • On-line measurement method for sweep-frequency ultrasonic focusing type sediment grain size distribution
  • On-line measurement method for sweep-frequency ultrasonic focusing type sediment grain size distribution
  • On-line measurement method for sweep-frequency ultrasonic focusing type sediment grain 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 sweep-frequency ultrasonic focusing type sediment grain size distribution. The method includes the steps: establishing a measurement device taking a focusing type ultrasonic probe as a core, and configuring sediment samples of different grain sizes by the aid of a sieving method and a microscopic method; debugging a measurement system, and starting the measurement device after the measurement system is accurately debugged; changing ultrasonic frequencies, and performing a series of tests taking sediment grain sizes as variables under different ultrasonic frequencies to obtain data of receiving waveforms; performing phase space division and symbolic dynamic filtering based on Hilbert transform for acquired signals to obtain parameter value measures related to the grain sizes; performing data fitting for the measures under different frequencies and scatter diagrams of the sediment grain sizes to obtain sediment grain size measurement models. According to the method, scattering attenuation in the propagation process can be effectively reduced, acceptable sound energy at a receiving transducer is improved, and signal-to-noise ratio and sensitivity and measurement accuracy of a whole measurement system are improved.

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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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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