Erhardt+Leimer OL 80 - Function; 3.1 Purpose; 3.2 Design; 3.3 Operating principle

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CCDarraycameraOptoLineOL80..
3. Function
3.1 Purpose
3.2 Design
TheCCDarraycameraOptoLineOL80..wasdevelopedforcon-
tact-freepositionmeasuring.Itdetectsthepositionofcontrasts(edg-
es,lines,utesorgrooves)onamovingweb.Themeasuringresult
canbeusedforwidthmeasuring,webguiding,followingupactuators
ortoolssuchascuttersetc..
Inthisdescriptionthecameraandstandardoperationforwidthmea-
suringandwebguidingwithoneortwocamerasisexplained.Spe-
cialisedapplicationsdesignedbyE+Laredescribedseparatelyinthe
systemspecicationsoroperatinginstructions.
Awidth measuring systemconsistsof:
- oneorseveralcameras
- asetofcables
- oneortwolighttransmitters
- aDO002.remotedisplay
Aweb guiding systemconsistsof:
- oneorseveralcameras
- asetofcables
- oneortwolighttransmitters
- anE+Lcontrollerwithcommandstation
3.3 Operating principle
Frontlighting
Backlighting
Scanningmethodes
Twodifferentscanningmethodsareusedtodetectcontrasts,front-
lightingandbacklighting.Themethodapplieddependsontheindi-
vidualjob.
Withthe frontlighting methodthelighttransmitterandcameraare
onthesameside,eitheraboveorbelowtheobject.Thecamera
catchesthelightreectedbytheobjectfromthelighttransmitter.
Whenfrontlightingisused,outeredgesandlines,utesorgrooves
canallbedetected.