The "Bi-Directional Scattering Function" BSDF of a diffuser depends on several parameters, such as surface properties, observational conditions and further. This paper describes experimental activities to achieve a better understanding about the interaction between diffuser properties and performance with regards to its scattering behavior. For this purpose a set of 24 diffusers with defined surface properties have been manufactured and systematically been investigated in a dedicated radiometric calibration measurement facility. The experimental data are compared with existing theoretical models.
The "Bi-Directional Scattering Function" BSDF of a diffuser depends on several parameters, such as surface properties, observational conditions and further. This paper describes experimental activities to achieve a better understanding about the interaction between diffuser properties and performance with regards to its scattering behavior. For this purpose a set of 24 diffusers with defined surface properties have been manufactured and systematically been investigated in a dedicated radiometric calibration measurement facility. The experimental data are compared with existing theoretical models.
The "Bi-Directional Scattering Function" BSDF of a diffuser depends on several parameters, such as surface properties,
observational conditions and further. This paper describes experimental activities to achieve a better understanding about
the interaction between diffuser properties and performance with regards to its scattering behavior. For this purpose a set
of 24 diffusers with defined surface properties have been manufactured and systematically been investigated in a
dedicated radiometric calibration measurement facility. The experimental data are compared with existing theoretical
models.
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, ZT, 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 ZT 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.
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