CN104062219A - Method for measuring cellular material permeability through image method - Google Patents

Abstract

The invention discloses a method for measuring cellular material permeability through an image method. The on-line test method in use involves sample devices, a dripping device, a parallel light source, a top camera, a horizontal camera and a computer. The sample devices are arranged right in front of CCD lenses, under the CCD lenses and right in front of the parallel light source respectively. Through the method for measuring cellular material permeability through the image method, clear profile images of liquid drops on cellular materials of different specifications can be obtained on line through camera shooting through the high-precision telephoto lens on the top and the front. A system is high in automation degree, easy and convenient to operate and reliable in operation, and has quite high test precision, tests are high in repeatability, and the obtained images can be used for computing permeability of concave cellular materials, convex cellular materials and planar cellular materials through the computer.

Description

A kind of image method is measured the method for poromerics permeance property

Technical field

The invention belongs to metallurgical and Materials Measurement field, relate to a kind of method of measuring poromerics permeance property, more particularly, the present invention relates to a kind of method of utilizing online image method to measure poromerics infiltration rate.

Background technology

Porosint is a kind of new engineering material of excellent performance, and its micromechanism is one of key factor affecting macroscopic properties and result of use.The quantitatively characterizing of porosint micromechanism and be always focus and the difficult point in Materials Science and Engineering field on the impact of physical property.

The permeance property of material refers to that, under certain pressure reduction, fluid is by the complexity of material.It not only depends on the kind of fluid, meanwhile, also depends on the structure of porosint.In general, the perforation porosity is high, pore shape even, the tortuosity in space is little, the ganoid porosint of pore, and its permeance property is good.Therefore,, under identical fluid, can also weigh with it the structure of porosint.

Sessile drop method is a kind of method of research surface phenomena, and it is self-assembling formation drop on horizontal base plate, and drop has direct relation in the change amount of unit interval inner volume and the permeance property of substrate.As shown in Figure 1, 2, 3 stable shaped on spill, convex, planar substrates of drop.

Summary of the invention

The object that the present invention proposes is in order to overcome the shortcoming of prior art, improves the automaticity of instrument shooting precision and observation, thereby provides a kind of image method to measure the method for poromerics permeance property.

Technical scheme of the present invention is:

Image method is measured a method for poromerics permeance property, and experiment test device, comprising: sampling device, drippage device, top camera, horizontal camera, source of parallel light and computing machine; Above-mentioned camera is digital camera, and is connected with computing machine by data line; The camera lens of described camera is long-focus CCD camera lens, this sampling device be placed in CCD camera lens dead ahead, CCD camera lens under and the dead ahead of source of parallel light.Image processing method is to utilize image method to measure correlation parameter, brings the volume computing formula under dissimilar substrate into, just can calculate the permeation volume of unit interval poromerics, i.e. permeability.

Described sampling device refers to the poromerics substrate of different size, comprises these three kinds of spills, convex, plane, and is stabilized in the drop on substrate.Drop drips by drippage device, guarantees the drop of each experiment drippage same volume, completes after drippage task, removes drippage device, prevents the impact on top camera.

Described source of parallel light is placed on sampling device dead astern, for the photography of camera provides best light condition.

The resolution of described top and horizontal CCD camera lens is more than or equal to 3,000,000 pixels, and adjustable focal length is more than or equal to 1.1m; Described CCD camera lens has loaded optical filter and filter plate.

Use image method provided by the invention to measure the method for poromerics permeance property, can take the photograph online to obtain the clear contour images of drop on dissimilar poromerics by top and the high-precision telephoto lens of level.Native system automaticity is high, easy and simple to handle reliable, has very high measuring accuracy, and experimental test is repeatable large, and the image of acquisition can carry out by computing machine the calculating of poromerics permeance property.For spill, convex, three kinds of dissimilar substrates of plane, there are specific droplet size computing method, binding time, just can calculate the permeance property of drop on dissimilar poromerics.

Accompanying drawing explanation

Fig. 1 is that drop is faced contour shape schematic diagram on spill substrate.

Fig. 2 is that drop is faced contour shape schematic diagram on convex substrate.

Fig. 3 is that drop is faced contour shape schematic diagram on horizontal base plate.

Fig. 4 is that drop is overlooked contour shape schematic diagram on substrate.

Fig. 5 is the device schematic diagram of on-line measurement poromerics permeance property of the present invention.

Drawing explanation:

Source of parallel light 1 sampling device 2 drippage device 3 top camera 4 horizontal camera 5 computing machines 6

Embodiment

Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.

As shown in Figure 5, observation part is comprised of camera 4,5 and computing machine 6, between camera 4,5 and computing machine 6, by USB port, connects.Adopt single reverted image machine image pickup mode to record the infiltration process that profit drops in ceramic pipe surface, suppose that drop its profile in infiltration process is elliposoidal, by camera image, read several characteristic lengths of its profile, problem has just become the volume of asking an ellipsoid of a face of cylinder truncation.

Open source of parallel light 1, regulate camera 4,5 to focus on sampling device, by drippage device 3, on sampling device 2, drip drop, remove drippage device 3 and use camera 4,5 to take simultaneously, the picture rich in detail obtaining in computing machine 6.Fig. 1,2,3 is the apparent contact angle of a typical drop on dissimilar substrate patterns while being greater than 90 °, now, we can be from the photo of taking the direct value of measurement elliptic parameter a, b, bring computing formula into and just can draw accordingly result.Below the in the situation that of three kinds of different poromerics substrates, cubing formula:

(1) on spill substrate:

$V_{\mathrm{droplet}}=\mathrm{\πab}[(c-c_0)-\frac{1}{3c^2}(c^3-c_0^3)]+4b{R}^2(\frac{\mathrm{\α}}{2}-\frac{\sin 2\mathrm{\α}}{4})$

(2) on convex substrate:

$V_{\mathrm{droplet}}=\mathrm{\πab}[(c-c_0)-\frac{1}{3c^2}(c^3-c_0^3)]-4b{R}^2(\frac{\mathrm{\α}}{2}-\frac{\sin 2\mathrm{\α}}{4})$

(3) on horizontal base plate:

$V_{\mathrm{droplet}}=\mathrm{\πab}[(c-c_0)-\frac{1}{3c^2}(c^3-c_0^3)]$

In sum, by liquid in ceramic pipe (outside) the high-speed camera picture of wall surface, can obtain drop at the volume of each time point, then obtain drop to the rate curve permeating in ceramic pipe micropore.

Claims (5)

1. with image method, measure a method for poromerics permeance property, experimental provision, comprising: sampling device, drippage device, top camera, horizontal camera, source of parallel light and computing machine; Above-mentioned camera is digital camera, and is connected with computing machine by data line; The camera lens of described camera is long-focus CCD camera lens, this sampling device be placed in CCD camera lens dead ahead, CCD camera lens under and the dead ahead of source of parallel light.

In accordance with the method for claim 1 in on-line measurement device, it is characterized in that, two cameras directly over sampling device and dead ahead, catch image respectively simultaneously, are transferred in computer.

In accordance with the method for claim 1 in on-line measurement device, it is characterized in that, source of parallel light be placed on sampling device just after, provide and take needed light condition.

In accordance with the method for claim 1 in on-line measurement device, it is characterized in that, drippage device is for drip the drop of same volume on substrate, and falls behind and remove rapidly on ground, prevents the interference to top camera.

5. in accordance with the method for claim 1, provide the computing formula that on three kinds of dissimilar poromerics substrates, drop permeation volume changes, and the computing method of infiltration rate.