Abstract
This study proposes an experimental stretching method and its effect using a flexible micro Fresnel lens made from polydimethylsiloxane (PDMS) material with 25 mm diameter, 1mm thickness. The PDMS lens is strained by a four-degree-of-freedom (DOF) stretching device to change the lens’s curvature. This stretching device consists of four linear stepping motors, placed concentric symmetry at the center of the PDMS lens. Each motor is operated via an A4988 stepper driver that receives the speed signal from the Arduino UNO controller. The simulation and experimental results are implemented to analyze and validate the performance of the stretched lens. The results indicated an increment of about 8% of the diameter and 12.3% of the imaging change after the stretching process.
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