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1	Development of PDI plates for Industrial Applications Siddiqui, Muhammad Saad, Iqbal, Tahseen January 2010 (has links) The aim of this Master’s Degree thesis project is to design and develop point diffraction interferometer plates. In this project the PDI plates are re-designed, changing the design which was used in previous projects in Halmstad University. The transparency of PDI plates can be controlled by coating them with NiCr film. Firstly, four plates with coating of different thickness of NiCr were developed. The relationship between transmittance and the thickness of NiCr was established by testing these plates for transmittance and reflectance with the help of a laser and an optical power meter. The absorption coefficient of clear substrates and reflection of light is also taken into account to achieve the correct results. The parameters like the diameter of semi-transparent area around the pinholes and the size of pinholes is chosen after fully understanding its application. The lay-out and description of design is also included in the report. point diffraction interferometer point diffraction interferometry PDI PDI plates semi-transparent plates nickel chromium coating surface roughness surface roughness measurement Electrophysics Elektrofysik Photonics Fotonik Surface engineering Ytbehandlingsteknik Material physics with surface physics Materialfysik med ytfysik