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- special scanners:
  for glass tubes
  for image acquisition
  seam detector 

- Scratch Detector




Scratch Detector


Commonly the quality of varnish is classified by its tolerance against scratches. To that purpose sample plates are varnished and different scratches are applied by a knife, pressed on the sample plate with varying force. The scratch detector allows a classification of the scratches similar to the usual human inspection. Compared with this state of the art inspection, it allows an objective, high precision and fast classification. The sensor is a combination of a special line projector and a high precision intensity detector. The samples are moved through the measurement field. If the scratches are in the measurement field, their visibility is characterised by the measured intensity.

Scratch Detector

Optionally a further characterisation of the scratches is possible by a measurement of the angle of visibility. To that purpose, a rotation of the sample plate is performed automatically, if a scratch is in the centre of the measurement field. The measured intensity diagram is evaluated to characterise the angular visibility.


Measurement objects:
  • reflective sample plates (other object geometry on demand).
Measurement values:
  • fraction of intensity, scattered at the scratches,
  • classification values (defined by distinct ranges of intensity),
  • optional angular distribution of scattered light - half width.
Sensitive Area:
  • standard: 3 mm (width) x 20 mm (height) area on the sample plate; other ranges on demand.
Sensor Components:
  • line projector (w = 60 mm; h = 60 mm; l = 180 mm);
  • detector (w = 60 mm; h = 60 mm; l = 180 mm).
  • sensor power supply 12 V- 15V, 1 A;
  • RS232-interface to host PC.
  • measurements values are evaluated, classified, stored and displayed either numerically and graphically OSD V 1.4 (Windows).
Measurement Principle:
  • high sensitive and robust evaluation of light, scattered at scratches.

If you are interested in further information, a demonstration, an adaptation of this sensor or a development of a solution of your measurement problem, please contact:

mail@opos.de or write or phone to:

OPOS Optical On Line Sensors
Hertzstr. 164b
D-76187 Karlsruhe / Germany
Tel +49 (721) 971305-0
Fax +49 (721) 971305-1

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