DE2018356A1 - Optical testing device - Google Patents

Description

Rudolf Busselmeier «, _ '', '

Patent attorney Augsburg the I ₅ . April WHERE

Augsburg 3i · Rehiingensiraße β Priority: 18. April 1969

Posifadi242 Pat. No. 19810/69

onio: Munich No. 7 «» Great Britain

5536/02 Th / Sch

PATENT APPLICATION

LEESONA LIMITED, Unity Works, Broadfield, HEYWOOD, Lancashire, England

Optical testing device The invention relates to an optical testing device.

There are many examples of industrial processes Test procedures, research programs or the like in which it is or would be useful to provide an apparatus for successive determination or evaluation of one or more properties of the light, which one Destination device reached from a number of different locations. The general aim of this invention is is to provide such a device which is reliable and effective and not unnecessarily complicated or expensive. As an example of the type of application of such a

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The examination of a surface can be mentioned, for example the surface of a piece of paper, tissue, mat or leaves, loose material such as coconut matting, plastic or other shavings, grain, rice or similar material. These substances can be checked with the help of such a light control device and errors can be discovered through the control. Such a test can be carried out by measuring the intensity of the light reflected from different parts of the surface or, if the material is suitable, by measuring the intensity of the light transmitted through the material. In each case, the light source will preferably have a specific, fixed intensity. A specific object of the invention is to provide an improved apparatus for this task .

The invention proposes that the testing device has a number of light guide strands, at least one set of corresponding ends of such light guide strands being arranged in a predetermined order. There are also provided scanning means which are movably arranged in a plane which is adjacent to the ends which are aligned in a certain arrangement. Furthermore, light guide devices are provided in connection with the scanning means. The light guides are sequentially aligned with each end in the aligned array as the scanning means is moved. Detektprmittel are also provided next to a set of corresponding ends of the light guide strands. The arrangement is chosen so that the light which is fed to a set of corresponding ends of the light guide strands can alternately pass through each light guide strand and consequently can reach the detector. The light guide means can for example consist of an opening in a rotatable disk. They can also consist of an additional light guide strand

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In certain expedient embodiments, the light is fed to a set of corresponding ends of the light guide strands from the surface to be tested. The scanning means are arranged between the respective other ends of these light guide strands and the detector.

In other embodiments, the light is a Set of the corresponding ends fed or directed towards the scanning means. While the light too exiting from the other group of the corresponding ends, it is reflected from the surface to be tested to the detector, or alternatively it can also pass through the material to be tested can pass through to the detector.

Fiber optic strands have the property that, though a set of corresponding ends are arranged in a circle, and the ends are substantially in the same Lying flat, the other set of corresponding ends selectable in a large range of different layers or Positions can be arranged according to the circumstances. So, if you can keep the continuous examination of the Surface of a continuous fabric, these other ends are preferably in a straight row, which is arranged across the width of the fabric web. The speed of rotation of the scanning means set in relation to the feed speed of the tissue so that the fabric is scanned line by line or thread by thread. The detector is usually a photocell, and it is desirable that it be adapted to continuously respond to the signal or the size of the radiation intensity reaching it can be adjusted.

The invention is described below with reference to the drawing described. Show it;

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Fig. 1 is a schematic, exploded

illustrated view of the invention Testing devices in one installation position for testing the surface of a continuous Fabric panel,

Fig. 2 is a schematic side view according to

2a and 2b show a schematic side view

similar to FIG. 2, but with a modified structure,

Fig. 3 is a schematic side view of a

modified embodiment of the invention,

FIG. 4 shows a side view similar to FIG. 3, but showing a further embodiment, and

FIGS. 5 and 6 are perspective views with still

other embodiments of the invention.

In FIGS. 1 and 2, a piece of fabric moving forward is shown which is carried by drive rollers 2 and which one should be checked. It is known that the intensity of the tissue piece 1 or reflected light passing through the piece of tissue 1 changes as a function of the tissue density or surface. The test device according to the invention enables this changing light intensity to be sampled and evaluates it continuously the end.

The device essentially consists of a number of light guide strands 5, a rotatably mounted and attached

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driven slotted disc 7 »a lens 9 and a photocell receiver 10.. ■

A light guide strand is an elongated piece of translucent or transparent material, such as glass or clear plastic material, for example optically perfect acrylic resin, the one

■■■■ -.- ■ unit / ·

outer layer or cladding Y has a lower index of refraction such that light which is on one side of the material enters, is sent through the material and within the light guide strand as a result the multiple total internal refraction is held. With such a light guide strand, the light occurs at the other End again. Instead of the above-mentioned light guide strand, any other device can be used, with which the same purpose is achievable. With the described Embodiment, the material of each strand is either plastic or fiberglass.

The Lichtleitstränge are shaped so that they, by unillustrated known Mrr xfffTrin 'a set of corresponding ends 4 of adjacent-lying * In Fig. K are, for example, the left ends side by side over the entire width of the woven fabric piece, while the other group of corresponding Ends 6, ie the right ends lie in a common vertical plane in the form of a circle. In Fig. 1, the ends of light guide strands are shown at a distance from one another for the sake of clarity. In practice, however, these ends are arranged adjacently. In front of the ends 6, the disc 7 is arranged, which has a narrow slot 8. The disc is rotatably mounted. It can be rotated either with a shaft drive 12 or with a circumferential drive I3 (see FIG. 2), 10 so that the slot 8 passes one after the other at the individual ends 6 of the light guide trunks' $. the

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Width of the slot 8 is substantially equal to that Diameter or the width of the fiber optic strand ends. In this way the whole comes out of these ends emerging light through the slot 8, while it moves over the corresponding end of the light guide strand. The lens 9 is a condenser lens and it is in front the disc arranged. This lens is used to direct the light from the light guide strands onto the photocell receiver 10 to direct. A hood 11 keeps the external light of the environment away from the optical system. The photocell receiver 10 is connected to a suitable signal unit or recording unit, not shown.

In use, the speed of rotation of the disk 7 becomes the linear speed of the piece of tissue 1 and the dimensions and number of the light guide strands 5 selected so that a close and precise scanning of the tissue surface is possible. The reflected and / or transmitted light (schematically with the help of arrows 3a and 3b shown in Fig. 2) enters the light guide strands 5 at their ends 4 a. However, it can only then get from the other ends 6 out to the photocell receiver, if the slot 8 on the corresponding other The end of it. In this way the output signal from the photocell receiver changes in the same way Way as the surface properties or density of the piece of tissue. In this way it can be a valuable and useful indicator and review of this Properties are continuously maintained.

The apparatus described above can of course be modified in various respects. For example Instead of the condenser lens 9 and the hood, a second row of light strands 5a (see FIG. 2a) can be provided be. These can have the same number as those on

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the other side of the disc located light guide strands. Their left ends are aligned with the right ends of the light Ioitsträng · 5. The fiber optic strands 5 «run in the direction Photocell receiver together so that their other ends 4a face the photocell receiver. To this Way is achieved by the construction described, the same effect as in the device described first. In addition, instead of the lens 9, a parabolic mirror 9a (see. Fig. 2b) can be used, which also guides the light to the photocell receiver.

FIG. 3 shows an arrangement in which the light from a source 16 is directed onto the pane 7. if if the disk 7 rotates, the light can alternately through the slit 8 to each end 4a of each light guide strand 5a arrive. In this embodiment, the photocell receiver 10a is arranged above the tissue surface. He can the light emitted from the ends 6a of the light guide strands 5a is directed to the tissue surface and which is reflected from there. The reflected light is passed through a number of light guide strands 5b, which calibrate with their lower ends across the Tissue piece 1 extend onto the photocell receiver 10a transfer. The lower ends 6a of the fiber optic strands are adjacent to the piece of tissue 1. The upper ends of the fiber optic strands 5a run in the direction of the photocell receiver 10a together. "

The embodiment shown in Fig. 4 corresponds that shown in Fig. 3 essentially, with the one Except that the photocell receiver 10a and the light guide strands 5b are arranged below the piece of fabric 1. In this embodiment, the light is from the Ends 6a directed through the tissue at the photocell receiver 10a.

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In the specific embodiments described above If the disk has an opening. Alternatively, the disk, as shown in FIG is to carry another light guide strand, one end 18 of which at the point of the opening on the Disc is arranged and the other end 19 is on the axis of rotation of the disc. This can be, for example be the case in that this end passes through a central bore in the shaft carrying the disc. The other end 19 ends either opposite, as the case may be a photosensitive agent or to a light source. The modification shown in FIG. 5 is preferably used in the embodiment according to FIG. 1.

Fig. 6 shows another embodiment. A Another light guide strand 20 can be arranged radially on the disk 7. The light guide strand 20 extends up to an exit point on the circumference of the disk 7. In this embodiment, the corresponding ends 6 'of the light guide strands 5' "which are either scanned or fed with light depending on the nacivuem, arranged in such a way that that they extend radially inward, up to the vicinity of the disk circumference. The good clarity For the sake of this, the light guide strands are shown at a distance from one another. In practice, however, their ends lie side by side. The above-mentioned light guide strands have a substantially round cross-section, so that the Basic output signal from the photocell receiver when scanning the end of the fiber optic strand has a variable amplitude. If errors or changes in material occur during the test, then the change in amplitude is multiplied. With such an arrangement Difficulties could arise if errors or changes occur which have a frequency similar to the Basic output signal Ee is possible because output

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signal by adding a suitable circuit modify this problem, at least to one certain part is resolved. Instead, however, it is preferred Modify the cross-sectional shape of the ends of the fiber optic strands so that no additional circuitry is required is required. This way by cutting the ends of the Provides light guide strands with a substantially rectangular cross-section, as is the case with those in FIGS. 1 and 6 ends 6 and 6 * shown is the case, the basic output signal from the detector, which is the ends of the scans adjacent fiber optic strands, very much more even and softer than when the ends of the light guide strands have round cross-section. The aforementioned disadvantage becomes common to everyone with such a design practical purposes avoided.

- 10 - claim

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Claims (1)

5536/02 Th / Sch - 10 - April 15, 1970 PATENT CLAIMS 1.) Optical testing device, characterized in that that there are a plurality of light guide strands (5) with at least one group of corresponding Ends (6) which are arranged in a predetermined order, further comprising scanning means which are movable are arranged in one adjacent to the ends (6) lying in the predetermined order, further Light guide means (8) connected to the scanning means (7), the light guide means (8) one after the other are aligned with each of the ends (6) arranged in the predetermined order when the scanning means (7) is moved, further with detector means, which are adjacent to a group of corresponding ends of the light guide tstränge (5) are arranged, the arrangement being chosen so that the corresponding to a group The ends of the light guide strands directed light alternately through each light guide strand (5) and consequently can reach the detector (10). 2. Optical test device according to claim 1, characterized in that g e identifier I think that the scanning means consist of a disk. 3. Optical test device according to claim 2, characterized in that the ends (6) in the predetermined Order are arranged in a circle, and that the disc (7) is rotatably arranged such that it leads the light guide means (8) past the ends (6) one after the other. k. Optical test device according to claim 2, characterized in that g β - 09844/1257 5536/02 Th / Sch - 11-15 April I97O k e η η ζ ei c h η et that the light guide means from another light guide strand (20) which is attached to the disc (7) exist. 5. Optical test device according to claims 3 or 4, characterized g e k e η η ζ e inet that the in given Order located ends (6) are arranged so that they are on the flat surface of the disc (7) demonstrate. 6. Optical test device according to claims 4 and 5 · thereby ge knows that one end of the extra Lichtleitstrangs (20) is arranged so that it can successively scan the ends (6), and that the other end of this light guide strand (20) is guided along the axis of the disc (7). 7. Optical test device according to claims 3 and 4, characterized in that a group of ends (6 ') of the light guide strands (5 ¹ ) is arranged so that they point radially inward on the circumference of the disc (7), the additional light guide strand (20) has one end in the circumference of the disc (7). 8. Optical .Prüfgerät according to claim 2, characterized in that the light guide means a Opening (8) in the disc (7) is. 9. Optical test device according to one of the preceding claims, characterized in that i chne t Means for guiding the light to the one group Corresponding ends of the light guide strands are provided from the surface to be tested, the scanning means are provided between the other ends of the light guide strands (5) and the detector means. 009844/12 57 ". ■ - 12 - 5536/02 Th / Sch - 12 - April 15, 1970 10. Optical test device according to one of claims 1 to 8, characterized in that i without t that means for Guide the lights to the group of the corresponding ends are provided by light guide means, the detector being arranged to receive light emerging from the other ends of the light guide strands and from the surface to be tested is reflected. 11. Optical test device according to one of the preceding Claims, characterized in that the ends (6) are arranged adjacent to one another. 12. Optical test device according to one of the preceding claims, characterized in that i chne t, that the detector comprises a photocell device which is suitable for generating output signals from the photocell. 13. Optical test device according to one of the preceding claims, characterized in that that the ends (6) of the light guide strands (5) lying in the vicinity of the detector have a substantially rectangular cross section. 14. Optical test device according to one of the preceding claims, characterized in that ' that the light guide strands are made of glass or translucent plastic material. 15 · Optical testing device according to claim 9, characterized in that the light guide strands from Made of quartz. 0098U / 1 257 / 3 Blank page