Retroreflex-Laserscanner
for polarimetry / ellipsometry at non-planar, extended objects (TRL 4)
The RREXXX imaging laser scanners consist of a combined transmitter/receiver unit (transceiver) and a retroreflector mounted in the beam path behind the object. They can be used for defect, dimensional or material testing of transparent objects or 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 reflecting 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 that can be visually checked directly.
Polarimetry setup
Ellipsometry setup and principle
- Development, control and optimization of production processes
- Quality control (in goods issue or goods receipt)
- Partially transparent (transmission > 10%) clear or colored articles also with high refractive powers (from flat glass to lenses and glass rods), also with very large depth expansion
- Extended shiny and reflective surfaces - also non-planar
- Imaging telecentric laser scanners
- Evaluation of transmission, gloss or reflectance profiles
- Evaluation of polarization effects allows calculation of:
- birefringent profiles
- pull-off force profiles
- Profiles of the ellipsometric or polarimetric parameters
- layer thickness profiles...
The scanners provide line scans at their image interface (just like line scan cameras). The following sizes can be determined from the images:
- Absolute values and anomalies of the quantities shown
- Sizes and accumulations of the defects or anomalies
- Deviations of the values from those of good samples
- Dimensions
Depending on the scanner type down to < 10 µm
Width 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 focusield (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.
Stress patterns in a complex glass cylinder
Different oil films on aluminum sheet (raw)
Image of different shiny silver metals
Different oil films on mirror sheet
Comparison of good (left) and bad product (right)
Send us your samples for a first free test or let us convince you with a device demonstration in your house!
We would be glas to adapt the sensors to your needs or develop new functions for you.
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