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.
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