Laser Profilometry

Description

Laser profilometry allows detecting surface flaws of the test object, as well as making accurate measurements of flaw dimensions. The technology is non-contact. The distance between the optical system and the test object surface can be dozens of centimetres. In particular, the technology can be used for automatic welded seam quality control that reveals surface flaws.

Operating principle

The technology is based on laser beam image processing when laser beam is bent by the test object profile. The most obvious method of profile height measurement is shown in Figure 1. The diffraction unit 2 converts narrow laser beam to the laser plane 3. The cross section of the laser plane and the test object surface is a test object profile that is detected by the camera 6. Profile image 7 enters the signal processor 4 that processes the image and calculates absolute size of the test object in millimetres.
prof
Figure 1. Operating principle

Main advantages of laser profilometry

      • The technology is non-contact
      • The distance between the optical system and the test object surface can be dozens of centimetres.
      • High efficiency
      • High resolution
      • High accuracy of flaw dimension measurements