A novel three dimensional profilometry technique by optical fiber interference projection was presented. Take the wavelength-modulated laser as the light source to make the purpose of interference fringe phase-shift by changing the wavelength of the precision power. Compare with the traditional means what changing the phase by PZT, the new method is easier in phase calibration and phase-shift controlling for its anti-interference and having no hysteresis. In addition, the experimental equipment can be associated with commercial interferometer so that their software can be taken as the tool for data processing.
In the traditional fringe reflection method for specular surface measurement, the change of phase is only due to the gradient changes. Through the gradient-based phase unwrapping algorithms eventually restored the surface shape. However, due to the approximate nature of the formula itself, the broadness and accuracy of measurement is limited in a certain range within. The actual change in phase comes from the gradient and the surface shape itself together. Therefore, the absolute phase and the surface shape model and the face shape recovery algorithm based on recursion were presented in this paper. Using the model in this paper largely makes up for the deficiencies of the traditional algorithm. A good effect in surface shape recovery has been achieved through the experiment.
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