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- W1983156917 abstract "The self-imaging phenomenon under coherent illumination or Talbot effect has been widely used in different fields including optical metrology. According to the Talbot effect, when a periodic grating is illuminated with spatially and temporary collimated coherent light, the grating is self-imaged at a certain distance, Z<sub>T</sub>, which depends on the inverse of the wavelength λ of the incident light and the square of the period, d, of the grating. This means that they can be seen at different positions Z<sub>T</sub> by changing either d or λ. Using the wavelength dependence of the self-images, and a fixed period, d, an application of the Talbot effect for three-dimensional and step-height measurement using a two-wavelength laser, appeared recently in the literature. We propose in this work to use an LCD to display a tunable grating. In our setup, we used a fixed wavelength and a dynamic 1-D grating to adjust the step-height measurement capabilities. We also analyze the possibility of measuring continuously varying surfaces with this technique. We include the preliminary results of our proposal." @default.
- W1983156917 created "2016-06-24" @default.
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- W1983156917 date "2009-08-20" @default.
- W1983156917 modified "2023-10-18" @default.
- W1983156917 title "Application of the Talbot effect for three-dimensional and step-height measurement using an LCD" @default.
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- W1983156917 doi "https://doi.org/10.1117/12.826396" @default.
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