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Fringe directionLaserSpeed LDV TheoryTwo laser beams cross at an angle 2* KK bisects the two laser beamsConstructive and Destructive Interference cause a Fringe PatternThe Fringe Pattern consists of light (constructive) and dark (destructive) stripes

I will show some examples 8

Traditional Length and Speed MeasurementsAccomplished by using a roller that contacts the material being measured

The material turns the roller as the material moves

An encoder or tachometer is attached to the rollerGenerates pulses as the wheel or roller rotatesRelies on friction between the material and rollerTaktile ; Pulsgeber

NEXT Disadvantages2Disadvantages of Contact Encoders/TachometersError caused by slippageDependent on frictionWheel pressureProduct surfaceGrease/ lubricant on surfaceMechanical inertiaRecalibrationDiameter changes because of wearDiameter changes because of debris build-upMaintenance Bearings and other mechanical parts wear out

Upper picture gypsum boardLower picture Glass wool

NEXT Slippage3Problem because of SlippageSlippage due to texture, slick coatings, lubricants, etc.Contact method relies on wheel circumference and # of rotationsContact measurement wheel:Rides on productBuilds-up debris or wears down, requires recalibration

NEXT build up wear down4dd = 100mm 1 circ = 314,16mm0,5 mm build up:d = 101 mmProblem because of Build-up= 0,989 % Loss off material1 circ = 317,3mmNEXT Laser Speed technology5Non-Contact Measurement TechnologyHighly accurate, repeatable product length and speed measurementsMeasures product directlyUses Laser Doppler Velocimetry (LDV) technologyTrue Zero Speed and direction measurement

Better than +/-0,05% accuracy, +/-0,02% repeatabilityPermanent calibratedIndependent of density and color of materialNEXT How it works6 Standoff DistanceLaser BeamsNon-Contact EncoderPass Line

Depth of Field+Vel-Vel

Non-contact encoder projects an interference pattern on the surface to be measured

How Non-Contact Laser Measurement WorksAs product moves, light is scattered back to the unit at a frequency proportional to the speed of the material

LDV Systems

Camera Based Systems LED source Gatter Systeme aso. 7Non-Contact Encoder Applications

Would it be suitable to all applictions? Yes

Imagin that the price for a Encoder is diffrent to more accurate LaserSpeed. We are more asked are the experts for tuff applications .

I will show some examples 9Application Example > Labeling1,5 % length and speed inaccuracy6000 meter roll90 meter of uncertainty Each roll costs a significant amount in unnecessary expenseGive away = roll length x material cost/sqm x contact encoder accuracy (1,5%)

ProblemLamination / Label line 1,5% length inaccuracy about slippage on slicky surface 10Application Example > LabelingInstall non-contact encoder at specific measurement points on the lineControl length and speed of lamination line and coating application+/- 0,02% repeatability Instead of 90 meter per every 6000 meter of uncertaintyLowers error to a max of 1,2m on a 6000 meter roll

Coating Control Lamination Control SolutionJust length but we also be able to do the control

Easy intergration

NEXT corugated Carboard 11Solving tail out boards problem

Z

Application Example > Cross Cutter ControlCorrugated Cartonboards

NEXT CUT to length control _fuhrmann12

Application Example > Flying Saw ControlFlying saw for PA12 coated Steel Automotive break tubes

Speed up to 160 M/min with a accuracy from +-0,2mm13Application Example > Cutting ControlProblem with slippage, mechanical inertiaControl length direct to the PLCInstead of +/- 1mm at line speed of 140m/min Lowers error to +/- 0,2mm by eliminate slippage and mechanic issues

SolutionJust length but we also be able to do the control

Easy intergration

NEXT corugated Carboard 14Application Example > Nonwoven, Soft Surfaces 2% length variation due to the density and surface Each variation costs a significant amountGive away + inaccurate length cut Control the guillotine or flying saw to improve to +/- 1mm length

Problem/SolutionLamination / Label line 1,5% length inaccuracy about slippage on slicky surface 15

Application Example > rough surfaceProblem/Solution2%- 3% length variation due to the roughness of surface Give away + inaccurate length cut Machine Control to improve to +/- 0,05% NEXT build up wear down16Conclusion: Laser Non-Contact Encoder AdvantagesLaser non-contact encoder is proven on many different types of manufacturing processesNo slippage error - optical system and does not contact the product

Permanent calibratedHigh +/-0.02% repeatability minimizes product waste, increases savingsNo moving parts to wear out: reduces maintenance and downtime, and lowers cost of ownership

Thank you Questions?

Hall A6 Stand 456

Fringe Pattern ExpandedConstructive Interference occurs when two laser beams are in phase and add together to equal the original laser density - light stripeDestructive Interference occurs when two laser beams are out of phase and the two laser beams cancel each other out - dark stripe