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)

- Development, control and optimization of production processes
- Quality control (in goods issue or goods receipt)
- 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
- Imaging telecentric laser scanners
- Transmitter and receiver combined in one unit (transceiver)
- Retroreflector behind the specimen
- Testing of transmission, gloss or reflectance profiles
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)
depending on the scanner type down to < 10 µm
Depending on the scanner type from 25 mm to (currently) 160 mm
- Combined transmitter and receiver unit (emits the laser beam, receives the retro-reflected light)
- retroreflector
- 24V power supply
- Extremely large depth of field (compared to cameras)
- robust against object displacement
- little effort for adjustment
- Image interface (GiG-E or CameraLink)
- RS-232 interface for parameter setting
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.
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