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Experimental studies of plasma-chemical etching of glass when manufacturing diffraction and hologram optical elements
Engineering Education # 05, May 2012
DOI: 10.7463/0512.0408094
The authors consider capabilities of manufacturing diffraction and hologram optical elements (DOE and HOE) with the use of the “Caroline 15 PE” machine. The purpose of the work was to increase the quality of binary DOE-HOE which is defined mainly by depth of the regular profile on the functional surface. It is shown that the maximum of this depth corresponds to the maximum of the etching selectivity of glass concerning a mask material. It is established that at thickness of chromic mask of 100 nanometers the PE method reaches depth of surface to 1,4 microns. It allows to increase the diffraction efficiency of DOE-HOE. Relative intensity of light in the second order of diffraction is 30 %; it allows to create new products of micro-optics.
77-30569/237276 Computerized simulation of the finishing process of a parabolic reflector
Engineering Education # 10, October 2011
The article describes working surface finish of a radio antenna parabolic reflector made of a composite material. This operation is carried out on a specialized machine tool by using the method of fixed axes. A special computer program was developed: it allows to calculate the expected real shape of the processed surface depending on a variation of factors of the finishing process. The article suggests a classification of estimated deviations of the processed surface from sphericity. The required accuracy of the surface shape of a paraboloid of revolution is reached by neutralization of initial deviations which arise at forming of a reflector during the finishing process.
77-30569/235503 Analysis of components ratio in the structure of porous tools made of abrasive composites
Engineering Education # 10, October 2011
The article covers potential ratios of abrasive powder, pores and couplant in the composite material of an abrasive tool. Analytical relations for calculating maximum fillings by a heterogeneous phase were obtained. The optimal composite structure is the structure which has a maximum proportion of the abrasive material in the tool. It is shown that for abrasive grain the size of which is less than 30 microns an optimal size of pores is 0,5 mm. Maximum volume filling of abrasive composites at continuous distribution of particles of heterogeneous phases according to sizes was calculated. It is shown that the maximum content of abrasive in the tool volume accounts for 15-16%. The authors describe an empirically defined criterion of tool formability characterizing the binder’s ability to keep abrasive grains.
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