Real-time contour fringes obtained with a variable synthetic wavelength from a single diode laser (original) (raw)
AI-generated Abstract
In this work, a method to generate digital speckle contour fringes using a single external cavity red diode laser is presented. By tuning the laser and reflecting light through a diffraction grating, dual emissions are produced, leading to the generation of a synthetic wavelength (λ S ). This allows for the modulation of high spatial frequency speckle patterns with a low-frequency interferogram, which accurately depicts object surface shapes. The technique demonstrates adaptability in contour interval adjustment according to the object's geometry and desired measurement precision, extending the range of synthetic wavelengths from tens of micrometers to several millimeters.
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