Hamdi Amine

Publications

1 Opto-Mechanical Characterization of Aspheric Lenses from the Hybrid Method

Authors: Aliouane Toufik, Hamdi Amine, Bouzid Djamel

Abstract:

Aspheric optical components are an alternative to the use of conventional lenses in the implementation of imaging systems for the visible range. Spherical lenses are capable of producing aberrations. Therefore, they are not able to focus all the light into a single point. Instead, aspherical lenses correct aberrations and provide better resolution even with compact lenses incorporating a small number of lenses.

Metrology of these components is very difficult especially when the resolution requirements increase and insufficient or complexity of conventional tools requires the development of specific approaches to characterization.

This work is part of the problem existed because the objectives are the study and comparison of different methods used to measure surface rays hybrid aspherical lenses.

Keywords: roughness, radius of curvature, manufacture of lenses, aspherical surface, precision molding

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Abstracts

2 The Equilibrium Position’s Effect on Stability of a Compliant 2-R Robot

Authors: Brahim Fernini, Hamdi Amine, Merghache Sidimohammed

Abstract:

Obtaining a good performance of robot’s arms and dynamic system stability control are closely related to the power saving and good robot stability during motion. These two factors can be achieved by adding passive springs to the robot to support the entire system at the equilibrium position. On the other hand, choosing a best equilibrium position reflects directly on a comfortable working and stable displacement of the robot. In this sense, this paper presents a simulation investigation on the effect of the equilibrium position on the stability and the energy provided by the robot by proposing four simulation cases. As per the authors’ investigation, no closed solution for this critical study has been reported. An explicit elbow down model of a 2-R robot has been modelled by adding passive springs. The authors in this paper develop the dynamic of a compliant 2-R robot by using the extended Newton-Euler (N-E) method. The dynamic simulation is investigated by using Matlab/Simulink based on motion with jerk zero at the start-stop path, which guarantees less vibration to the robot’s articulations. The simulation results show that the energy-saving and good robot stability can be achieved whenever the equilibrium position is close from the beginning of motion with avoiding the unstable phase of the robot during working.

Keywords: Stability, Work, Power Saving, equilibrium position, N-E

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1 Opto-Mechanical Characterization of Aspheric Lenses from the Hybrid Method

Authors: Aliouane Toufik, Hamdi Amine, Bouzid Djamel

Abstract:

Aspheric optical components are an alternative to the use of conventional lenses in the implementation of imaging systems for the visible range. Spherical lenses are capable of producing aberrations. Therefore, they are not able to focus all the light into a single point. Instead, aspherical lenses correct aberrations and provide better resolution even with compact lenses incorporating a small number of lenses. Metrology of these components is very difficult especially when the resolution requirements increase and insufficient or complexity of conventional tools requires the development of specific approaches to characterization. This work is part of the problem existed because the objectives are the study and comparison of different methods used to measure surface rays hybrid aspherical lenses.

Keywords: roughness, radius of curvature, manufacture of lenses, aspherical surface, precision molding

Procedia PDF Downloads 343