Retroreflex scanner

Retroreflex laser scanner for
Transmission testing of objects with refractive powers or
Reflectivity testing of curved surfaces


The RSXXX imaging laser scanners consist of a combined transmitter/receiver unit (detector) and a retroreflector mounted in the beam path behind the object. They can be used either for defect and dimensional inspection of transparent test specimens or for inspection of surfaces. These tests differ only in the arrangement of the test object, detector and retroreflector. In principle, they can be combined if necessary (e.g. with partially reflective surfaces). Compared to camera systems, they are characterized by an extremely large depth of focus and an almost uncritical adjustment: the beams deflected from the object only have to hit the reflector - a requirement easily checked by eye.


All setups allow the automatic visual inspection of the specimen. The following options allow further characterizations:

  • the polarization option allows ellipsometric / polarimetric  characterization of the material,
  • the dimensional measurement option determines the surface coordinates and angles (in reflection) or beam displacement and refractive power measurements of the specimen,
  • both options together give a detailed picture of the specimen quality.

Transmission

Even for specimen or regions with high refracting power transmission testing is possible (indicated by red color of transceiver).

(C) Fraunhofer-IOSB


Standard transmission setup

Signals for transmission testing  are only available for specimen / regions with low refractive power (indicated by red color of detector).

(C) Fraunhofer-IOSB

Reflection

Even for curved surfaces testing is possible (indicated by red color of transceiver). No complicated adjustment procedures of component angles, heights or distances!

(C) Fraunhofer-IOSB


Standard reflection setup

Signals for reflectivity testing  are only available for exactly aligned components and flat, perfectly aligned specimen (indicated by red color of detector).

(C) Fraunhofer-IOSB

Lab setup (transmission)

Lab setup (reflection)


Specifications

Fields of application
  • Development, control and optimization of production processes
  • Quality control (in goods issue or goods receipt)
Test objects
  • Extended transparent (transmission > 10%) clear or colored articles also with high refractive powers (from flat glass to lenses and glass rods) and with very large depth expansion
  • Extended glossy and reflective surfaces - also non-planar
Principle
  • Imaging telecentric laser scanners
  • Transmitter and receiver combined in one unit (transceiver)
  • Retroreflector behind the specimen
  • Testing of transmission, gloss or reflectance profiles
Quantities for characterizing the products
The scanners provide line scans at their image interface (just like line scan cameras). The following quantities can be determined from the images:
  • Absolute values and anomalies of transmission, gloss or reflectance profiles
  • Sizes and accumulations of the defects or anomalies
  • Dimensions
  • Material parameters: refractive index, dichroism, birefringence or coating
    (polarization option)
  • Co-ordinates and angles of reflective or glossy surfaces,
    beam displacement and refraction of transparent specimen
    (dimensional measurement option)
    Resolution
    depending on the scanner type down to < 10 µm

    Test area
    Depending on the scanner type from 25 mm to (currently) 160 mm

    Laser class
    3R

    Components
    • Combined transmitter and receiver unit (emits the laser beam, receives the retro-reflected light)
    • retroreflector
    • 24V power supply
    Particularities
    • Extremely large depth of field (compared to cameras)
    • robust against object displacement
    • little effort for adjustment
    Interfaces
    • Image interface (GiG-E or CameraLink)
    • RS-232 interface for parameter setting  
    Software
    OPOS Scanner Player (OSP) for taking pictures and configuring the scanners. A complete evaluation software (Purity) with line connection is available from our partner Fraunhofer IOSB.

    Image samples

    Defects in laminated glass panes (point defect, fracture, imprint, fluff)

    Defects on black, painted surfaces: point pimples, paint runs and flow lines


    Send us your samples for a first non-binding test or let us convince you with a device demonstration in your house!


    We would be glad to adapt our sensors to your needs or develop new functions for your application.


    Patents

    • M. Hartrumpf, "Laserscanner-Meßsystem"; DE19806288A1
    • M. Hartrumpf, "LASER SCANNER MEASUREMENT SYSTEM"; EP1056987A1
    • M. Hartrumpf, "Laser Scanner Measurement System"; US6858836B1
    • M. Hartrumpf, "Vorrichtung und Verfahren zur optischen Charakterisierung von Materialien": EP11760701.0 
    • M. Hartrumpf, "Apparatus and method for optically characterizing materials": US9222879B2
    • M. Hartrumpf, C.Negara, Configurable Retro-Reflective Sensor System for the Improved Characterization of the Properties of a Sample";US 2019/0170636 A1

    Patents applications

    • M. Hartrumpf, C. Negara, "Configurable Retro-Reflective Sensor System for the Improved Characterization of the Properties of a Sample": EP 3 465 145
    • M. Hartrumpf, "Verfahren zur Prüfung transparenter, reflektierender oder glänzender Proben mittels Laserscan":
      DE 10 2023 001 792
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