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Frequency sweeping ultrasonic focusing type sediment grain size distribution on-line measurer

A particle size distribution and ultrasonic technology, used in ultrasonic liquid-solid two-phase flow measurement, sediment particle size, and hydrological instruments. It can solve problems such as incomplete fluid information, achieve comprehensive attenuation information, improve energy, and reduce scattering attenuation. Effect

Inactive Publication Date: 2017-05-31
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When measuring in nature, the fluid information is not comprehensive, and the reflected waves of each particle will also affect each other, which cannot be accurately described by the general ultrasonic model

Method used

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  • Frequency sweeping ultrasonic focusing type sediment grain size distribution on-line measurer
  • Frequency sweeping ultrasonic focusing type sediment grain size distribution on-line measurer
  • Frequency sweeping ultrasonic focusing type sediment grain size distribution on-line measurer

Examples

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] The detection box 9 is a cuboid with four complete sides, and the other two opposite sides are opened to allow the suspended mass water to circulate. Two focused ultrasonic transducers 1 and 2 are symmetrically attached to a pair of the detection box 9. on the side. The shell 12 with an arc-shaped cross section is wrapped around the surface where the focused ultrasonic transducer is located, which reduces the resistance of fluid flow outside the detection box 9 and is beneficial to the protection of the ultrasonic transducer. One end of the cable 8 is connected to the engine 7, and the other end is connected to the ultrasonic transmitting transducer 1. After inputting the descending command in the control host, the engine 7 is started, and the cable 8 is lowered for a corresponding distance. The detection box 9 Put it under water and the two focused ultrasonic ...

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Abstract

The invention discloses a frequency sweeping ultrasonic focusing type sediment grain size distribution on-line measurer which comprises a pair of focusing type ultrasonic transducers, (one for transmission and the other one for receiving), a detection box body, a cable rope, a control main unit and corresponding circuits. The focusing type ultrasonic transducers adopt a spherical array focusing mode; a frequency sweeping signal generated by a signal generator is converted into an ultrasonic beam with high directionality, and then is received by the focusing type ultrasonic receiving probes with the consistent central frequency. The relevant circuits comprise a signal generation module and a signal processing module; and the core of the signal generation module is a DDS-based frequency sweeping signal generation circuit. The frequency sweeping ultrasonic focusing type sediment grain size distribution on-line measurer is simple and flexible; and according to the requirements for testing different frequencies for grain sizes of different places, the measurement range and the practicability of the measurer are improved, and the measurement precision is improved.

Description

technical field [0001] The invention relates to the technical fields of ultrasonic liquid-solid two-phase flow measurement, hydrological instruments, and sediment particle size, in particular to a frequency-sweeping ultrasonic focusing type online measuring instrument for sediment particle size distribution. Background technique [0002] Water is the foundation of life and an important part of modern industry. The problem of water resources in our country is becoming more and more serious at this stage, and the study of river suspended matter has a great impact on the natural water cycle, distribution and utilization. [0003] The particle size and distribution of river suspended matter can reflect the information of river water movement, which has guiding significance for the construction of water conservancy projects and the protection of water conservancy machinery. [0004] The methods for measuring the particle size of the suspended substance range from the sieving met...

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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