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Method for measuring particle size and gradation of mixed sand based on auto-correlation algorithm

A measurement method and autocorrelation technology, applied in computing, image data processing, instruments, etc., can solve the problems of strict water quality requirements, inability to popularize and popularize, time-consuming and cumbersome, etc.

Inactive Publication Date: 2015-06-03
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sieving method is the most traditional method for measuring the particle size of sediment, but it needs to be completed in the laboratory, which is time-consuming and cumbersome; the sedimentation method has strict requirements on the particle size range, and is suitable for fine sand between 0.062mm and 1mm; laser Diffraction law is also only applicable to fine sand, it is very sensitive to the external environment, has strict requirements on water quality, and the experimental equipment is expensive, so it cannot be popularized and used

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  • Method for measuring particle size and gradation of mixed sand based on auto-correlation algorithm
  • Method for measuring particle size and gradation of mixed sand based on auto-correlation algorithm
  • Method for measuring particle size and gradation of mixed sand based on auto-correlation algorithm

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Embodiment 1

[0049] figure 1 A set of measuring equipment capable of realizing the measuring method of the present invention is shown, and the measuring equipment is composed of image acquisition equipment and a computer. The image acquisition device includes a black flat panel 1 , a tripod 2 , a level 3 , a digital camera 4 , a size calibration object 5 and a glass plate 6 ; the digital camera 4 is connected to a computer 8 .

[0050] Such as figure 2 Shown, the present invention is a kind of measurement method based on the mixed sand particle size of autocorrelation algorithm and gradation, comprises the following steps,

[0051] (1) Select 5 groups of uniform sand with an average particle size of 1-10mm, obtain the correlation representative curves of the 5 groups of uniform sand in turn, and calculate the average particle size of each group of uniform sand; specifically include the following sub-steps:

[0052] (1.1) Spread the sand sample on the black plate 1, flatten it with a gla...

Embodiment 2

[0083] The inventive method is applied to 60 groups of mixed sands, and equally utilizes figure 1 Measuring equipment shown. Measurement procedure is identical with embodiment 1, obtains the mean particle diameter of these 60 groups of mixed sands after step 6, as Figure 8 As shown, the median particle size of these 60 groups of mixed sands is obtained after step 8, such as Figure 9 shown.

[0084] The average particle diameter measured by the inventive method is compared with the measurement result of the traditional sieving method, and the comparison results are as follows: Figure 8As shown, the vertical axis represents the average particle size measured by the present invention based on the autocorrelation algorithm, the horizontal axis represents the average particle size measured by the traditional sieving method, and each symbolic circle represents a group of target mixed sand measurements. The obtained average particle size results are close to the dotted line of ...

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Abstract

The invention discloses a method for measuring particle size and gradation of mixed sand based on an auto-correlation algorithm. The method comprises three steps: measuring the mean particle size of multiple groups of the sand, creating a calibration chart, and obtaining the particle size and the gradation of the mixed sand. An image of uniform sand is photographed through a digital camera, a correlation curve is drawn through the auto-correlation algorithm, the mean particle size is calculated according to the rise of the correlation curve, and a calibration chart of the mixed sand is created; a correlation representative curve of the mixed sand is created through the auto-correlation algorithm and added to the calibration chart, an area rate of various parts of the uniform sand is solved by nonlinear programming, the area rate is conversed to a mass rate so as to obtain the gradation, the mean particle size is obtained after calculating, and a mass cumulative curve and a mass distribution curve are drawn to obtain the median particle size. By using the method for measuring the particle size and the gradation of the mixed sand based on the auto-correlation algorithm, field and on-site real-time measurements are realized, and accuracy measurement on the particle size and the gradation of the mixed sand is realized through universal available equipment.

Description

technical field [0001] The invention relates to a method for measuring the particle size and gradation of mixed sand, which is especially suitable for measuring the particle size and gradation of sediment with a particle size between 1-10mm. Background technique [0002] Sediment is closely related to human society. On the one hand, fine sand can silt and irrigate farmland, fertile land, and coarse sand can be used as building materials. On the other hand, sediment particles will affect the construction cost and operation safety of water conservancy and water transportation projects. The determination of diameter has important guiding significance for river regulation and reservoir dredging. The particle size of sediment is the most basic characteristic of sediment and the most important parameter to determine the movement state of sediment such as start-up, transport and settlement. Traditional sediment measurement methods mainly include sieving method, sedimentation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/60
Inventor 成志轩刘海江刘慧赖富春於刚节刘腾君叶洲腾
Owner ZHEJIANG UNIV
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