SU1224576A1 - Method and arrangement for determining support surface of soft flat materials - Google Patents

Abstract

The invention relates to a measuring technique and can be used, in particular, to determine the supporting surface of materials (the ratio of the contact area of the material under investigation with the supporting plane to the area of its entire surface), mainly textile. The purpose of the invention is to improve the accuracy of determination. The original irradiating luminous flux from the illuminator through the beam splitter is directed to the light splitter, which the initial luminous flux splits into a large number of light beams. The latter are used with a zoom lens, which allows to vary the angle of convergence of the beams, through a transparent body made in the form of the plates, coated on both sides with the antireflection layer, are directed onto the material being studied, loaded with the body. The luminous flux scattered by the material under study is collected by the zoom lens and guided to a light beam splitter made in the form of optical fibers, the ends of which are facing the zoom lens are dispersed. Next, the luminous flux is passed to the beam-splitting unit, which directs it to the photoelectric recorder. The light source is split by a light splitter into a large number of individual light beams. The split beams with the zoom lens are focused into the reference plane in contact with the material under study, with two solid angles S and E of convergence. Then, the light scattered by the material under study is collected at the same solid angles 9 and 9, respectively, the intensities I and Ij of the collected light are measured at two values of b, and Sj, respectively. The reference surface F of the material under investigation is calculated by the formula tr fl - 1.9, with the first of these solid angles of the BTO coincidence being chosen 9, the swarms and - QI 2ird where FO is the support by (L 9 O surface, I, 1 is the light intensity , b ,, 92 are the solid angles of convergence, L is the wavelength of the light flux, d, is the size of the minimum structural element of the material under study (for example, the diameter of the pile or fabric thread), d, is the maximum height of the protrusions of the relief of the material under study. 1 Cp f-crystals, 4 ill.

Description

The invention relates to a measuring technique and can be used, in particular, to determine the supporting surface of materials (the ratio of the contact area of the material under investigation with the supporting plane to the area of its entire surface), mainly textile.

The purpose of the invention is to improve the accuracy of determining the support surface of flat soft materials.

FIG. 1 shows a block diagram of an apparatus for determining the surface of flat soft materials; in fig. 2 - structural diagram of the light-splinter; in fig. 3 - the course of the rays in the device when the material under study is illuminated with radiation from a large angle 9, convergence; in fig. 4 - the course of the rays in the device when the material under study is illuminated with radiation with a lower convergence angle b.

A device for determining the reference surface of flat soft materials contains (Fig. 1) a photoelectric recorder 1, successively arranged illuminator 2, which creates a parallel light flux of predominantly monochromatic light, which can be a laser, a light emitting diode, an objective lens and the like. , a splitting unit 3, which can serve as a Glan-Foucault prism, optically linking the photoelectric recorder 1 to the system 4 forming a light flux, consisting of consecutive lights of the bristle 5 and the zoom lens 6, and the transparent body 7, made in the form of a glass plane-parallel plate, on both sides covered with an antireflection layer, which is located above the material under study 8. The supporting plane 9 is the body plane 7, which is in contact with the material under study 8 In order for body 7 not to affect the intensity of the light scattered by the material under study 8, it is coated on both sides with an anti-reflection layer.

Light splinter 5 (Fig. 2) made in the form of a piece of harness from a set of fiber light guide 10, placed in compound 11, for example an opaque epoxy resin. The ends of the optical fibers 10 in the plane of the slice directed to the lens-zoom lens 6, are dispersed. The distribution of the ends of optical fibers is necessary to create conditions for unimpeded passage through the light beam splitter.

5 in the direction from the lens-zoom lens 6 to the beam-splitting unit 3 only the light flux, which clearly falls into the ends of the optical fibers. The beam splitting unit 3, the light beam splitter 5, the lens-zoom lens 6 and the body 7 are placed coaxially on the axis of the irradiating light flux.

The method for determining the support surface of flat soft materials with

using the proposed device is carried out as follows.

The initial irradiating light flux from the illuminator 2 through the light-emitting diode unit 3 is directed to the light splitter 5, which splits the initial light flux into a large number of predominantly identical light beams. The last object is a zoom lens 6, allowing yugzim

change the angle of convergence of the beams, through the transparent body 7, made in the form of a glass plate covered on both sides with an antireflection iron, are directed onto the material under study

8, loaded by the body 7. The luminous flux scattered by the material under investigation .8, by the zoom lens 6, is collected and sent to the light splitter 5, then it is passed to the Beam splitting unit 3, which directs it to the photoelectric recorder 1. The original light flux by the split splitter 5 is split into a large number of separate light beams 12 and 13, which limit the apertures 14 and 15 (the ends of the optical fibers) are in the same plane 16. The split beams are focused by a zoom lens 6 into the reference plate. 9-plane contact with the test material 8.

When focusing with a large convergence angle (Fig. 3), only structural elements of the material under study 8 are illuminated with bright spots, located directly in the reference plane 9 or remote from it for a distance not exceeding d. The light beam 12, scattered only by the indicated structural elements, reaches

of the lens-zoom lens 6 at the same angle as it was directed at the material under study 8, and, completely through the aperture 14 in the light splitter

5 reaches a luminous unit 3 which is guided to a photoelectric recorder 1, which fixes the intensity of radiation 1 scattered by the structural elements of the material under study 8, on the same reference plane. The light beam 13 formed by the aperture 15 and scattered by a structural element located outside the beam waist reaches the zoom lens 6 at an angle that does not coincide with the contact angle, which leads to a blurry light spot on the plane 16 of the light split-5 around the aperture 15. Since the apertures of the beams (the ends of the optical fibers) are dispersed in the plane 16, a small fraction of the intensity of the scattered light flux passes through the light diffuser 5 as compared to the intensity of the scattered element that the test material 8 comprised within the reference plane.

When focusing with a smaller angle like a day (Fig. 4), all structural elements of the surface of the material under study 8 are illuminated with bright spots, regardless of whether they are located in the reference plane 9 or not. The scattered beams 12 and 13 in all cases reach the lens-zoom 6 at an angle equal to the angle of convergence, and clearly enter the apertures 14 and 15 on the light splitter 5, through which the beam-splitting unit is fully reached and then directed to the photoelectric recorder 1, fixing the intensity of radiation 1 scattered throughout the surface of the material under study.

The reference surface Fg is calculated as the ratio scattered by the material under study 8 and recorded by the photoelectric recorder 1 intensity

Sivnichnyh 1 and Ij light at two values of the angle b, and Q convergence, taking into account the coefficient of correction K -, i.e.

I ,. 9gFJ, the first of these bodily convergence. Choose

and second

-8,4

2 Sd,

where FJ is the reference surface, I ,, light intensity, b, c are the solid angles of convergence, L is the light flux wavelength, d, is the size of the minimum structural element of the material, for example, the diameter of the pile or filament 5 5 5 0 5 o

five

0

five

nor, d - the maximum height of the protrusions of the relief of the material under study.

In order to avoid a spurious signal that could get into the photoelectric recorder 1, reflected from the surface of the beam splitter 5 directed towards the beam-splitting unit 3, the Glan-Foucault prism is used as the beam-splitting unit 3, which polarizes the radiation passing through it. Polarized radiation, the passage of the light splitter 5, consisting of optical fibers, is completely depolarized and scattered on the test material 8 and returning to the beam splitting unit, the charger is sent to the photoelectric recorder 1. In addition, polarized radiation in the beam splitting unit 3 reflects from the light splitter 5, it remains polarized and the beam-splitting unit 3 does not direct it to the photoelectric recorder 1, but passes it back to the illuminator 2, where it is diffused.

Claims (3)

1. A method for determining the supporting surface of flat soft materials, mainly textile, which press the material under investigation to a flat surface, illuminate it with a light flux, record the intensity of light reflected from the material under study, and determine the reference surface The material under investigation, characterized in that, in order to improve the determination accuracy, the illuminating luminous flux is split into several light beams, these beams are focused into the plane of contact between the flat surface The spikes with the surface of the material under study, with two values of solid angles 0 and 9 convergence, collect the light scattered by the material under investigation into the same solid angles Q, and 6j, The intensities I are measured, and Ij collected light at two values b | and 6j, respectively, and determine the reference surface P of the investigated Formula F at, Lj. the first solid angle of convergence is chosen 9, l1 - - D 2 id the second is S, i where L is the wavelength of the luminous flux, d is the size of the minimum structural element of the material, for example the diameter of the pile or thread of the fabric, dj is the maximum height of the projections of the relief of the material under study. 2. A device for determining the reference surface, flat soft Materials, comprising successively arranged illuminator, a system for forming a luminous flux and a transparent body designed to press the material under investigation a photoelectric recorder, characterized in that it is equipped with a beam-splitting unit located between the illuminator and the forming system luminous flux and associated with a photoelectric recorder, the luminous flux formation system is made in the form of conjugated svetorassche- Pitel and zoom-lens and the transparent body is in the form a glass plate coated on both sides with an anti-reflective layer. 3. The device according to claim 2, characterized in that the light source is made in the form of fiber light guides, the ends of which are facing the zoom lens, are dispersed. FIG. 2 Compiled by L. Lobzova Editor A. Ogar Tehred I. Popovich Corrector A. Obruchar Order 1938/37 Circulation 670 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4