Analysis of holographic interferogram of microelectromechanical system with non harmonic cycles excitation

Recent technological trends based on miniaturization of mechanical, electromechanical and photonic devices to the microscopic scale have led to the development of microelectromechanical systems (MEMS). Effective development of MEMS components requires the synergy of advanced design, analysis, and fabrication methodologies as well as application of quantitative metrology techniques for characterizing their performance, reliability and integrity during design stage. In this paper, we describe analysis of holographic interferograms of MEMS links which includes interferometric fringes related to deformation appearing because of the non-harmonic excitation of MEMS link

Analysis holographic interferogram of links of vibrating systems

A procedure for calculating the amplitudes of the normal components of the displacement vector in case of threedimensional vibrations of any point on the surface of mechanical vibrating system is proposed on the basis of experimental holographic interfrometry data and the theory of vibrations of mechanical systems. The analysis of fringe in holographic interferogram is based on several holographic interferogram of the vibrating links of wave mechanical system which are obtained using Time-Average holographic interferometry metho

Inversion of the generalized abel transform in the analysis of fluid vibration in a tube

Fluid vibrations in axi-symmetric geometry according to the first harmonic in the circumferential direction are analyzed. This problem has a practical application in the analysis of transverse vibrations of fluid in an axi-symmetric pipe. In order to obtain volumetric strains from the holographic image of the vibrating fluid the inversion of the generalized Abel transform is to be performed. A numerical procedure for the solution of this problem is propose

Analysis of the dynamics of the vibratory valve-injector

Construction of a novel vibratory valve-injector and its design optimization is presented in the paper. The principle of the system operation is based on the effect of dynamic positioning of a steel ball in a vibrating tube. Theoretical analysis of the stability of this non-linear system is coupled together with the experimental study of an operating valve. Laser holographic interferometry is used for the identification and optimization of working regimes of the syste

Intelligent piezoelectric polymers PVDF-PZT for biosensing applications

Nowadays a growing number of biosensing systems in micro- and nanoscale rely in expensive and bulky equipment that must capable accurately to resolve the angle or wavelength of optical interrogation. The costs, size, sensitivity, properties and etc which are required to assemble these biosensing tools, may limit the portability of such systems, and may restrict their usefulness in sensing applications outside of a controlled environment. This research covers creation and investigations of new piezoelectric materials based on PVDF and PZT with unique properties, i.e. synthesis, piezoelectric thin film formation, imprint of microperiodic structures, analysis of surface morphology by Atomic Force Microscopy, and analysis of diffraction efficiencies using laser diffractometer. These developments of new piezoelectric films have made it possible to understand the strengthening and deformation mechanisms in micro- and nanoscales together by bringing new insights in biosensing applications

Development and experimental analysis of piezoelectric optical scanner with implemented periodical microstructure

Piezoelectric optical scanner is developed for multi-coordinate control of optical laser beam by excitation of microstructures. The manufactured microstructure is the periodical structure which was implemented in piezoelectric optical scanner design. Such type of opto-micro-mechanical systems can be used for accurate angular or linear deflection of optical elements in various optomechanical and optoelectronic systems. The operating principle of these devices is based on piezoelectric effect and on conversion of high-frequency multi-dimensional mechanical oscillations of piezoelectric vibration transducers into directional multi-coordinate motion of the optical elements in the measurement chain. The main distinctive feature of such optical piezoelectric scanners is the combination of high micrometer range resolution with a wide range of angular deflections of the scanning elements. The manufacturing process and visualization of the microstructure were presented. The device consists of piezoelectric cylinder and a scanning element with three degrees of freedom. The control model of this device was derived using simulation results of optical scanner by COMSOL Multiphysics software. ESPI digital holographic PRISMA system was used to validate the result of simulation of piezoelectric optical scanner and to test the functionality of piezoelectric optical scanner with implemented microstructure

Investigation of dynamic of smart valve using holographic PRISM system

The purpose of this work is to find dynamic characteristics of a new smart valve with piezoactuator used in different mechatronic systems, in medicine, alimentary industry, etc. Novelty of this valve is that one of the parts of its control device, i.e. membrane, is comprised of two raster steel disks (each disc has the same number of notches) and the flow is controlled by means of optical interference effect generated between them. With the help of holographic PRISM system we investigated which piezocylinder, segmented or nonsegmented, is better to use in the system of smart valve. Also we represented the original patented scheme of the smart valv

Calculation of vibrations of an incompressible elastic structure

Rubber and photo-elastic materials at elevated temperatures exhibit incompressible behavior. The vibrations of a structure by taking the incompressibility constraint into account by the penalty method are analyzed. Reduced order numerical integration of the penalty term is performed. Graphical representation of volumetric strains at the points of reduced integration is proposed for validation of the calculated eigenmodes

Analysis of the dynamics of the vibratory valve-injector

Construction of a novel vibratory valve-injector and its design optimization is presented in the paper. The principle of the system operation is based on the effect of dynamic positioning of a steel ball in a vibrating tube. Theoretical analysis of the stability of this non-linear system is coupled together with the experimental study of an operating valve. Laser holographic interferometry is used for the identification and optimization of working regimes of the syste

MEASUREMENT OF VIBRATION PARAMETERS OF THE WAVEGUIDE FOR MEDICAL TREATMENT

Methods allowing investigation of vibrations of the stainless steel waveguide by combining noncontact techniques with the state-of-the-art multiphysics software are developed. The vibrations of the waveguide, used in nowadays surgery are examined by the aids of the holographic interferometry technique, vibrometer based on Doppler shift of backscattered laser light and the virtual model of the waveguide is created by the Comsol Multiphysics software