GB1380452A - Method of detecting faults - Google Patents
Method of detecting faultsInfo
- Publication number
- GB1380452A GB1380452A GB3353272A GB3353272A GB1380452A GB 1380452 A GB1380452 A GB 1380452A GB 3353272 A GB3353272 A GB 3353272A GB 3353272 A GB3353272 A GB 3353272A GB 1380452 A GB1380452 A GB 1380452A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detectors
- web
- array
- detector
- output
- 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.)
- Expired
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
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
Abstract
1380452 Photo-electric flaw detectors GAO GESELLSCHAFT FUR AUTOMATION & ORGANIZATION mbH 18 July 1972 [30 July 1971] 33532/72 Heading G1A Flaws in a proper web are detected by scanning at two areas which are substantially identical in respect of permissable zones of varying transparency, the scanning arrangement being provided with a regulating mechanism for aligning the scanners with the identical areas, and the scanners including photo-electric cells the outputs of which are differentials. As shown, Fig. 3, a moving, proper web bearing repetative watermarks arranged in pairs across its width is scanned by two detector arrays 6 each having a plurality of detectors (5) connected to individual differentiating circuits 8. The differentiated output of each detector in one array is subtracted from that of the correspondingly positioned detector in the second array by means of differential amplifiers 9 the resulting signals then being combined by an OR gate 10 the output of which is applied to a threshold circuit 11 which produces an output on detection of a flaw greater than a pre-selected severity. Each detector array is also provided with two detectors 14, 15; 16, 17 which scan the web ahead of the main array and are connected to a servo system which adjusts the position of the scanning head relative to the watermark when this is detected. This ensures that the correspondingly positioned detectors in the two arrays view similar points in the two watermarks is that no fault output is produced if the watermarks are identical. The detectors (5), which may be photo-transistors, are spaced from the web and are provided with masks close to the web having slots extending across the width of the web to define their field of view and are arranged in two rows, alternate detectors being staggered and spaced so that their fields of view overlap slightly. Security threads may be scanned by an additional array of detectors which are arranged in pairs along the length of the thread and cover a transverse distance somewhat greater than the permissible tolerance in the lateral position of the thread, Figs. 4 and 5 (not shown). The differences between the differentiated outputs of the pairs of detectors are obtained and combined as described above. The system may use the transmission of light through the web or may respond to the fluorescence of materials in the web excited by incident radiation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT665271A AT338544B (en) | 1971-07-30 | 1971-07-30 | DEVICE FOR DETECTING DEFECTS IN PAPER TRAILS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1380452A true GB1380452A (en) | 1975-01-15 |
Family
ID=3588462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3353272A Expired GB1380452A (en) | 1971-07-30 | 1972-07-18 | Method of detecting faults |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT338544B (en) |
| DE (1) | DE2234818C3 (en) |
| FR (1) | FR2149120A5 (en) |
| GB (1) | GB1380452A (en) |
| IT (1) | IT963349B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH608628A5 (en) * | 1975-11-21 | 1979-01-15 | Sick Optik Elektronik Erwin | |
| US4512662A (en) * | 1981-07-06 | 1985-04-23 | Tobias Philip E | Plate scanner for printing plates |
| DE3713279C2 (en) * | 1987-04-18 | 1994-01-20 | Laser Sorter Gmbh | Process for the detection of dimensional errors and / or the distortion of paper webs or format papers |
| DE4232550A1 (en) * | 1992-09-29 | 1994-03-31 | Laser Sorter Gmbh | Measuring sizes of defects, esp. holes in materials - detecting pulsed light of varying intensity passing through or reflected by material |
| DE4232538A1 (en) * | 1992-09-29 | 1994-03-31 | Laser Sorter Gmbh | Testing moving, opaque material paths for the presence of holes - detecting light passing through material from transmitting to reception diodes |
| CN109596623B (en) * | 2018-12-21 | 2021-07-06 | 无锡先导智能装备股份有限公司 | Defect detection method and device |
-
1971
- 1971-07-30 AT AT665271A patent/AT338544B/en not_active IP Right Cessation
-
1972
- 1972-07-15 DE DE19722234818 patent/DE2234818C3/en not_active Expired
- 1972-07-18 GB GB3353272A patent/GB1380452A/en not_active Expired
- 1972-07-26 IT IT2740272A patent/IT963349B/en active
- 1972-07-26 FR FR7226971A patent/FR2149120A5/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2234818A1 (en) | 1973-01-25 |
| FR2149120A5 (en) | 1973-03-23 |
| ATA665271A (en) | 1976-12-15 |
| IT963349B (en) | 1974-01-10 |
| AT338544B (en) | 1977-08-25 |
| DE2234818C3 (en) | 1975-01-16 |
| DE2234818B2 (en) | 1974-05-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |