IT1258013B - Optical barrier for detection of objects in movement - Google Patents
Optical barrier for detection of objects in movementInfo
- Publication number
- IT1258013B IT1258013B ITBO920021A ITBO920021A IT1258013B IT 1258013 B IT1258013 B IT 1258013B IT BO920021 A ITBO920021 A IT BO920021A IT BO920021 A ITBO920021 A IT BO920021A IT 1258013 B IT1258013 B IT 1258013B
- Authority
- IT
- Italy
- Prior art keywords
- photoreceivers
- unit
- objects
- detection
- movement
- Prior art date
Links
- 230000004888 barrier function Effects 0.000 title abstract 2
- 238000001514 detection method Methods 0.000 title 1
- 230000003287 optical effect Effects 0.000 title 1
- 230000007717 exclusion Effects 0.000 abstract 1
Abstract
The barrier comprises several infrared emitting diodes 5, multiplexed and modulated at a predetermined frequency, a reception unit 6 having several photoreceivers 7, and an apparatus 8 for management of the signals generated by the photoreceivers. The apparatus 8 comprises means 14, 52 of calculating the number of photoreceivers that are considered to be in use, means 14, 56, 57 to verify the presence of a single one of the photoreceivers that is considered to be malfunctioning if it generates a signal of value less than a predetermined value for a time greater than a predetermined time, and means 14, 57 of controlling the exclusion of the malfunctioning photoreceiver. The apparatus can thus fulfil its functions even when the unit 6 is degraded in functionality, since the photoreceivers in use are fewer in number than the photoreceivers defined in the unit 6. <IMAGE>
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO920021A IT1258013B (en) | 1992-01-17 | 1992-01-17 | Optical barrier for detection of objects in movement |
EP93100574A EP0563516A3 (en) | 1992-01-17 | 1993-01-15 | Optical barrier for detecting moving objects |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO920021A IT1258013B (en) | 1992-01-17 | 1992-01-17 | Optical barrier for detection of objects in movement |
Publications (3)
Publication Number | Publication Date |
---|---|
ITBO920021A0 ITBO920021A0 (en) | 1992-01-17 |
ITBO920021A1 ITBO920021A1 (en) | 1993-07-17 |
IT1258013B true IT1258013B (en) | 1996-02-20 |
Family
ID=11337938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITBO920021A IT1258013B (en) | 1992-01-17 | 1992-01-17 | Optical barrier for detection of objects in movement |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1258013B (en) |
-
1992
- 1992-01-17 IT ITBO920021A patent/IT1258013B/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ITBO920021A1 (en) | 1993-07-17 |
ITBO920021A0 (en) | 1992-01-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19990128 |