EP0053151A1 - Procede pour la surveillance optique de qualite de marchandises transparentes et appareil pour sa mise en oeuvre - Google Patents

Procede pour la surveillance optique de qualite de marchandises transparentes et appareil pour sa mise en oeuvre

Info

Publication number
EP0053151A1
EP0053151A1 EP81901533A EP81901533A EP0053151A1 EP 0053151 A1 EP0053151 A1 EP 0053151A1 EP 81901533 A EP81901533 A EP 81901533A EP 81901533 A EP81901533 A EP 81901533A EP 0053151 A1 EP0053151 A1 EP 0053151A1
Authority
EP
European Patent Office
Prior art keywords
detection
signal
detectors
emitters
radiation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81901533A
Other languages
German (de)
English (en)
Inventor
Peter Hermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0053151A1 publication Critical patent/EP0053151A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents

Definitions

  • the invention relates to a method for the semi-automatic or fully automatic quality inspection of transparent media, in which the change in a beam path through the interference points is used to detect them, and a device (device system) with which
  • a special application of the method and the device lies in the testing of glasses, especially hollow glasses, which are checked for cracks and other defects.
  • the optical crack test method which is mainly dealt with here, was based on a highly variable, individual arrangement of a plurality of lighting bodies of the same type and a number of individual detectors, only by their sensitivity, which is usually relatively undefined solid angle zones Secondary beam detected and which reacted to all radiators of the same ace. It is still the most common method in production control today. If you want to achieve reasonably acceptable results, long and tedious adjustment work by experienced, qualified employees is necessary for every type of test work and the amount of equipment increases enormously with the requirements.
  • radiators with different colors or with the same type of radiation but different modulation frequencies are used.
  • the method partially simplifies the setup of a test head, but is limited in terms of expenditure (FR-PS 1 588 308).
  • radiators and detectors In practice, the need has arisen to place radiators and detectors at a greater distance from the measurement object in order to improve the space available, to make the device less dependent on the position accuracy of the measurement object and to improve the ratio of useful signal to interference signal. (In most cases, the scattered light decreases quadratically, while the useful light in certain areas decreases linearly with the distance.) In conventional systems, however, a small distance is unavoidable (detection angle range, scattered light accumulation, mutual influence of different arrangements).
  • test heads which have been built with a lot of effort, are very individual and make it impossible to standardize the arrangement.
  • a partial solution for standardizing the structure gives the following method. Fixed sub-units with emitters and detectors can be suitably joined together as building blocks, which reduces the time required for the installation. The space problem is only partially solved (DE 28 02 107 AI).
  • the present invention goes in detail and in the conception new ways to substantially reduce the above-mentioned problems with the aim of reducing the outlay on equipment and increasing the test quality and also includes the necessary equipment with which this (and analog) Process can be carried out economically.
  • the method according to the invention assumes that a beam emanating from an emitter irradiates a measuring point on the measurement object in the appropriate form. If there is a disturbance at this point, in the case specifically described here, a crack, a reflected beam is thrown from there into a limited solid angle range.
  • the method based on the fact is arranged that in a relatively large distance from the measurement object door surface a standard stocked Detek ⁇ which stanchions without mechanical Verillone-, can be divided by programming in detector zones which cover enough 'room angle to cracks with certain Capture orientation and location.
  • detector zones which cover enough 'room angle to cracks with certain Capture orientation and location.
  • a single detector-emitter system is each intended for a (possibly a few) measuring zone on the glass and for a limited range of crack angles.
  • the superimposition of several such systems then leads to a complete inspection of the measurement object.
  • the measuring zones of the different systems can partially overlap, which results in multiple use of the mostly standard arranged detector elements.
  • the sensitivity can be changed within a zone. Surface elements that belong to different systems at the same time can adopt an optimal sensitivity for each system separately by programming.
  • Fig. 1 beam path and detection area
  • Fig. 4 signal block diagram of the electro-optical device system.
  • FIG. 1 shows a cylindrical glass body 1 with a crack 2, which reflects 5 the beam 4 emanating from the radiator 3 and throws it onto the detector surface 6.
  • Test object and measuring device instead.
  • this can be used in such a way that the detection surface 6 in FIG. 1 is not completely occupied with detection elements, but rather is reflected only on strips 8 transverse to the direction of movement of the reflection point 9 of the
  • Such detection strips are summarized in terms of apparatus in detector blocks 7, which are connected to the evaluating device.
  • a large number of emitters are normally used to adequately detect different types of cracks at different locations, which in turn can be arranged regularly and in a standardized manner.
  • system separation is carried out using a sequential method, ie all elements belonging to a subsystem are activated simultaneously for a certain time interval in a sufficiently rapid sequence, but different subsystems are never activated at the same time.
  • the response sensitivities of a detector can also be selected differently depending on the subsystems in which it works, ie it has quasi different system-related sensitivities at the same time.
  • the device is provided with memories in which the assignment of the detector elements to the different systems and the different sensitivities of the detector elements in the different systems are programmed. Programming can be carried out with buttons or with a data carrier (punch cards, punched tape, magnetic tape, magnetic disks) which is customary in data technology.
  • a device If a device is sufficiently equipped with emitters and detectors, it is possible to adapt a measuring device to a certain type of glass practically exclusively by programming. This opens up the possibility of generating the programming semi-automatically (interactively) or fully automatically.
  • a small computer determines e.g. the assignments and sensitivities in a learning process with good and faulty glasses.
  • the emitters of the individual systems are periodically briefly switched on (pulsed) at certain time intervals. See 42 of FIG. 4 for this.
  • the detectors assigned to this system are activated and measure the increase in radiation compared to the time before the emitters were switched on. If the
  • OMPI If the value specified by the programming for this system and the corresponding detector grows, a corresponding signal is forwarded to the evaluation logic, which effects a necessary action (display, ejection of the glass).
  • the evaluation logic can make an action dependent on further information (for example, designation of a glass).
  • the evaluation logic can be expanded as required (e.g. small computer), evaluate the data statistically and forward them in a suitable form.
  • the specified type of channel separation also results in a very strong suppression of radiation which results from the environment, even if this radiation is not constant over time (e.g. fluctuations of 100 Hz in the case of incandescent lamps)
  • Another component of the present invention is the relationship between the distance between the detection elements and their size, because it enables a better distinction to be made between reflecting or refractive zones and scattering zones.
  • the signal-technical system separation provides the necessary prerequisites for choosing a suitable distance. 2
  • the surface 21 is exposed to a uniform interference or scattered radiation
  • zone 22 the brightness is determined by a useful signal, e.g. the radiation reflected by a crack with a curvature is increased approximately uniformly. In this situation it is clear that the ratio of
  • Radiation intensity on detector 23 in detector block 7 z is the greatest on detector 24 when detector 23 is completely in zone 22.
  • the distance of the detectors from the radiating point should be at least so large that it can be completely immersed in the diverging beam of the signal.
  • OI be used if the detectors have separate signal paths up to the response threshold.
  • This method achieves a maximum useful / interference signal ratio for a given radiation.
  • a cylindrical hollow glass 31 rotates around the axis 32 during the test.
  • the opening zone is irradiated by the emitters 33 and by the emitter 34 by means of reflection on the inner wall.
  • Radiators 35 and 36 irradiate a deeper lying zone from different angles in such a way that as far as possible all occurring cracks throw evaluable bundles of rays into the cylindrical detection area.
  • 38 and 39 are possible axes for detection cylinders which are occupied by detector blocks 7.
  • Typical beam areas of the reflected useful signals are indicated by the line pairs 33 and 37, the areas belonging to 33 and 37 belonging to different independent subsystems.
  • a clock oscillator 41 drives a coding logic 42 which, on the one hand, emits the time-staggered pulses for the power amplifiers 43 of the semiconductor infrared emitters with a wavelength of approximately 0.9 ⁇ m for the radiators S1 to S16, and on the other hand generates the associated system code 44 for activating the detectors in the detector blocks 7, which are each equipped with 8 detectors D1 to ⁇ D8.
  • the repetition rate is 1000 / s, with a switch-on period of the emitter of 5 us.
  • the emitted radiation 55 is received at a wide angle by the sensitive semiconductor detectors 45, converted into an electrical signal, filtered and amplified.
  • the subsequent stage 46 compares this with an analog signal from the digital / analog converter 47, which depends on the system code and the programming from the selector logic gik 48 is controlled.
  • the digital signals resulting from the comparison are selected in the selector 48 in accordance with the system code and the programming, reduced by OR circuits and then stored in the memory 49 until further evaluation.
  • the signals are already linked in the detector block 7 in order to save on connecting lines.
  • the evaluation part 51 a micro-computer
  • the signals are stored, further reduced, evaluated and prepared for the displays on counters 55, lamp formers 56 and screens 53.
  • the definition of the systems is done on a switch panel 50 performed.
  • this preselection can also be input to the evaluation part 51 via a keyboard 54 or by means of one of the usual data carriers.
  • the cylindrically constructed spotlights 3 can be easily assembled and disassembled by means of a snap lock> and, for test purposes, replaced by spotlights with visible light which have the same beam geometry.
  • the rays emanating from a semiconductor infrared emitter are bundled by means of a bi-convex lens in such a way that the imaging plane of the emitter lies further away than the measurement object and that a suitable cross-sectional area of the beam on the measurement object arises, which is approximately the same Lens cross section corresponds.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

Des felures et d'autres defauts dans des verres seront detectes lorsque des rayons visibles ou voisins du spectre visible sont devies ou reflechis. D'apres le procede selon l'invention, les sources et detecteurs optiques sont disposes de maniere classique. Pour obtenir un rapport optimum entre le signal utile et le signal disperse, certaines relations geometriques sont utilisees. Dans l'appareil selon l'invention, on dispose des groupes detecteurs en relation avec les sources de rayonnement. Ces groupes sont, en ce qui concerne la technique des signaux, independants grace a un systeme special multicanaux. Une installation de test complexe sera reduite a un certain nombre de systeme partiels faciles a regler. De la, il resulte une economie de moyens lors de l'installation, des meilleurs resultats, une reproductibilite et une standardisation de la construction.
EP81901533A 1980-06-16 1981-06-12 Procede pour la surveillance optique de qualite de marchandises transparentes et appareil pour sa mise en oeuvre Withdrawn EP0053151A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4599/80 1980-06-16
CH4599/80A CH652826A5 (de) 1980-06-16 1980-06-16 Vorrichtung zur erkennung von fehlern, insbesondere risse, in transparenten koerpern auf optischem wege.

Publications (1)

Publication Number Publication Date
EP0053151A1 true EP0053151A1 (fr) 1982-06-09

Family

ID=4279096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81901533A Withdrawn EP0053151A1 (fr) 1980-06-16 1981-06-12 Procede pour la surveillance optique de qualite de marchandises transparentes et appareil pour sa mise en oeuvre

Country Status (4)

Country Link
EP (1) EP0053151A1 (fr)
CH (1) CH652826A5 (fr)
IT (1) IT1138411B (fr)
WO (1) WO1981003706A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3095506A1 (fr) 2019-04-29 2020-10-30 Tiama Ligne de contrôle de récipients vides en verre
WO2021209704A1 (fr) 2020-04-16 2021-10-21 Tiama Poste et procédé pour détecter en translation des défauts de glaçures sur des récipients en verre

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3111194C2 (de) * 1981-03-21 1984-01-05 Fa. Hermann Heye, 3063 Obernkirchen Verfahren und Vorrichtung zur Feststellung von Fehlern von Glasgegenständen
ATE59702T1 (de) * 1985-11-15 1991-01-15 Hermann Peter Vorrichtung zur erkennung von fehlern, insbesondere rissen, in transparenten koerpern auf optischem wege.
DE19651924A1 (de) * 1996-12-13 1998-06-18 Dieter Olschewski Behälterglasprüfverfahren und -vorrichtungen
US5895911A (en) * 1998-01-22 1999-04-20 Emhart Glass S.A. Glass container body check detector
US6275287B1 (en) † 1998-04-25 2001-08-14 Nihon Yamamura Glass Co., Ltd. Check detector for glass bottle neck and finish portion
EP1147405B1 (fr) * 1999-01-19 2006-06-14 Visiglas Sociéte Anomyme Procede et dispositif pour detecter des glacures dans des pieces en matiere translucide ou transparente
US6937339B2 (en) † 2001-03-14 2005-08-30 Hitachi Engineering Co., Ltd. Inspection device and system for inspecting foreign matters in a liquid filled transparent container
DE102014002582B4 (de) 2014-02-26 2018-10-11 Heye International Gmbh Verfahren zur Erkennung von Rissen in den Wandungen von Hohlglasartikeln

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378276A1 (fr) * 1977-01-25 1978-08-18 Emballage Ste Gle Pour Procede et dispositif pour la detection optique de defauts dans des objets transparents, notamment en verre
FR2401415A1 (fr) * 1977-08-24 1979-03-23 Emballage Ste Gle Pour Inspection et controle d'objets transparents
FR2432342A1 (fr) * 1978-08-02 1980-02-29 Emballage Ste Gle Pour Inspection et controle d'objets transparents
US4213042A (en) * 1978-10-02 1980-07-15 Barry-Wehmiller Company Container chipped crown ring detector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8103706A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3095506A1 (fr) 2019-04-29 2020-10-30 Tiama Ligne de contrôle de récipients vides en verre
WO2020221975A1 (fr) 2019-04-29 2020-11-05 Tiama Ligne de contrôle de récipients vides en verre
WO2021209704A1 (fr) 2020-04-16 2021-10-21 Tiama Poste et procédé pour détecter en translation des défauts de glaçures sur des récipients en verre
FR3109444A1 (fr) 2020-04-16 2021-10-22 Tiama Poste et procédé pour détecter en translation des défauts de glaçures sur des récipients en verre

Also Published As

Publication number Publication date
CH652826A5 (de) 1985-11-29
IT1138411B (it) 1986-09-17
IT8122337A0 (it) 1981-06-16
WO1981003706A1 (fr) 1981-12-24

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Effective date: 19821129