Laser Diffraction on Particles of a Damaged Surface Layer of Piezoceramics

Authors S.P. Lushchin1, O.S. Voronkin2

1National University Zaporizhzhia Polytechnic, 64, Zhukovskogo st., 69063 Zaporizhzhia, Ukraine

2Ukrainian Free University, 9а, Barellistr, D-80638, Munich, Germany

Issue Volume 15, Year 2023, Number 3
Dates Received 20 February 2023; revised manuscript received 23 June 2023; published online 30 June 2023
Citation S.P. Lushchin, O.S. Voronkin, J. Nano- Electron. Phys. 15 No 3, 03036 (2023)
PACS Number(s) 77.84.Dy, 42.25.Fx
Keywords Laser diffraction, Particles (79) , Damaged surface layer, Piezoceramics.

The phenomenon of diffraction of laser radiation by particles of a damaged surface layer of a piezoceramic deposited on a plane-parallel glass plate was studied. A diffraction pattern is clearly observed in reflected and transmitted light, which is an alternation of light and dark concentric rings. These rings correspond to the conditions of maxima and minima. A bright spot is observed in the center of the diffraction pattern. The dependence of the radius of diffraction rings on the thickness of the glass plate was established. The diffraction angles at a given value of the order of maximum for different thicknesses of the glass plate were the same. The particles of the damaged surface layer of the piezoceramic, which scatter light, have different characteristic sizes. The study of particles using optical microscopy showed that their sizes are in the range of ~ (1 ÷ 3) m. The shape of the grains is predominantly close to spherical. The Fraunhofer approximation was used to analyze the diffraction pattern. The distribution of the light intensity of the diffraction pattern depending on the diffraction angle has been analyzed. The simulation of the total scattered intensity as a function of the angle for particles with a diameter of 1.7 m and 3.0 m has been performed. The diffraction angles become smaller as the particle size increases. The distribution of the light flux in the diffraction pattern is constructed. This graph shows that most of the scattering intensity is concentrated near the center of the diffraction pattern, where the vast majority of the laser radiation falls. As the diffraction angle increases, the relative intensity of the maxima obeys the regularity 1 : 0.71 : 0.25 : 0.13. The size of the particles of the damaged surface layer of the piezoceramic was estimated using the laser diffraction method. The average particle diameter of the surface damaged layer of the piezoceramic is 1.7 m. It can be argued that particles of such sizes make the main contribution to the creation of the diffraction pattern obtained by us under these experimental conditions.

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