Thesis Defense - Uğur Çelik (MSEE)

Uğur Çelik – M.Sc. in Electrical and Electronics Engineering  

Asst. Prof. Göktürk Poyrazoğlu – Advisor

Date: 10.05.2024

Time: 13.00

Location: AB1 414

TECHNICAL DESIGN AND SIMULATION OF A SCANNER BASED ON

PIEZOELECTRIC ACTUATOR

Asst. Prof. Göktürk Poyrazoğlu, Özyeğin University

Prof. Esra Alveroğlu Durucu, Istanbul Technical University

Assoc. Prof. Zuhal Er, Istanbul Technical University

Abstract:

Microelectromechanical systems (MEMS), offers compact and tailored solutions for a wide variety of applications such as laser beam guidance, tomography, microfluidic control, laser-based displays, LIDAR. These advantages of MEMS technology are important for the efficiency of the designed systems. This thesis aims to develop a scanner with high scanning frequency and scanning angle moved by a PZT-4 thin film.

Our thesis focuses on optimizing the designed system using finite element modeling. With this modeling, the movements resulting from the electrical input applied to the PZT-based actuator are evaluated. Additionally, with finite element modeling, the stress distribution on the system and its natural mode oscillations are examined.

In out-of-phase motion, the system was operated with 100V at a mechanical resonance frequency of 91 kHz. In-phase movement is at 208 Hz levels. This movement adds depth to the scan. Under these operating conditions, a scanning angle of 12.5 degrees is achieved. The width of the mirror is made is 0.66 mm. Mechanical deformations occur as a result of the system operating at high frequency. The theoretical calculation shows that 70 % of the existing mirror surface can be used efficiently. According to theoretical calculations, the power consumption of the system is around 1.5 mW. The designed system is intended to be used in applications where speed is needed, such as laser projectors and medical applications.

Bio:

Uğur Çelik B.Sc. graduated from Istanbul Technical University in 2019. He started working as an Optical Design Engineer at Vestel Elektronics in 2020. In the academic field, he is about to complete his master's degree in Electrical and Electronics Engineering at Özyeğin University. At the same time, he continues to work as a Senior Optical Design Specialist at Vestel.