Erhardt+Leimer OL 80 - 5.3 Determining the light transmitter size and distance M between the light transmitter and camera

BPage8 BEA--220265-EN-04
CCDarraycameraOptoLineOL80..
5.2.1 Systems with one camera:
5.2.2 Systems with two cameras:
 The web must never lie outside the camera measuring range.

TheE+Llighttransmitterisavailablewithone uorescenttube
(FS16.1) andwithtwouorescenttubes(FS16.2).Ifsufcient
spaceisavailable,thelighttransmittershouldalwaysbeusedwith
twouorescenttubes.
Whenselectingthelighttransmitter,pleaseobservethefollowingcri-
teria:
- distanceKbetweenthecameraandweb
- distanceLbetweenthelighttransmitterandweb
- thelighttransmitteroperationalrange
measuringrange=max.webwidth+max.webmovement**+safety*
measuringrange=max.webwidth-min.webwidth+max.webmovement**+safety*
*Dependingontheapplication,asafety
clearanceof50-100mmmustbeal-
lowedforineachcase.
**Onapplicationswithanactuating
element,e.g.pivotingframe,thestroke
mustbetakenintoaccountwithregard
towebmovement.
5.3 Determining the light
transmitter size and dis-
tance M between the light
transmitter and camera
CCDcamera
...notusable
100mm...
Operationalrange
Web
Lighttransmitter
CCDcamera
visualrange
Distances:camera-Lighttransmitter-Web
DistanceKbetweenthecameraandwebisdeterminedbythemea-
suringrange.DistanceLbetweenthelighttransmitterandwebdeter-
minesthescanningprocess.
Whenusingfrontlightingthedistancebetweenthelighttransmitter
andthewebshouldbeasshortaspossibletocapturethemaximum
amountoflight.Thefollowingappliesforbacklighting;theshorter
thedistancebetweenthelighttransmitterandtheweb,thegreater
thedangerofdirtbeingsharplydepictedonthelighttransmitter,
causingincorrectmeasurements.Werecommendaminimumdis-
tanceof100mm.
 The camera visual range must always be located in the light
transmitter operational range. On E+L light transmitters, the
outer 100 mm are not usable for the cameras.
Measuringrange
2