• خليل ابراهيم امحان
  • khalil ibraheem imhan
  • تدريسي : قسم هندسة تقنيات الاجهزة الطبية
  • Teaching : Department of Medical Instrumentation
  • دكتوراه هندسة ميكانيك
  • PhD in Mechanical Engineering
  • drkhalilhabib@esraa.edu.iq
  • khalilibrahimimhan63@gmail.comdr.khalil.i
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    المحاضرات الالكترونية - 4
    year syllabuses Dep. Step Lectures
    2023-2024 نظم الليزر الطبية Department of Medical Instrumentation المرحلة الرابعة Types of laser 2
    2023-2024 نظم الليزر الطبية Department of Medical Instrumentation المرحلة الرابعة Types of laser
    2023-2024 نظم الليزر الطبية Department of Medical Instrumentation المرحلة الرابعة Laser Generation
    2021-2022 نظم الليزر الطبية Department of Medical Instrumentation المرحلة الخامسة Engineering of Radiation Instruments
    Research

    Research

    2017 optics and laser technology
    Nowadays, laser tube bending process has become commonly used in laser material processing and fabrication fields because of its ability to produce such forms and shapes that cannot be achieved by normal mechanical bending tools. The process can avoid and overcome most of bending defects like wall thinning, wrinkling, spring back and ovalization. This investigation focused on the experimental, analytical modeling, and numerical simulation to give more understanding of the process. In this work a high power pulsed Nd-Yag laser of maximum average power laser 300 (W) emitting at 1064 nm and fiber coupled has been used to irradiate stainless steel 304 tubes of diameter 12.7 mm, 0.6 mm thickness and 60 mm in length. An analytical model has been used to determine the bending angle by using Matlab program software. The changes of material specification during the laser tube bending process due to the temperature rise has been studied and the analytical model has been modified and enhanced. Particle Swarm Optimization (PSO) was used to optimize the analytical and experimental results and reduce the mean absolute error. © 2017 Elsevier Ltd

    2018 optics and laser technology
    Laser forming is a flexible control process that has a wide spectrum of applications; particularly, laser tube bending. It offers the perfect solution for many industrial fields, such as aerospace, engines, heat exchangers, and air conditioners. A high power pulsed Nd-YAG laser with a maximum average power of 300 W emitting at 1064 nm and fiber-coupled is used to irradiate stainless steel 304 (SS304) tubes of 12.7 mm diameter, 0.6 mm thickness and 70 mm length. Moreover, a motorized rotation stage with a computer controller is employed to hold and rotate the tube. In this paper, an experimental investigation is carried out to improve the laser tube bending process by enhancing the absorption coefficient of the material and the mechanical formability using laser softening heat treatment. The material surface is coated with an oxidization layer; hence, the material absorption of laser light is increased and the temperature rapidly rises. The processing speed is enhanced and the output bending angle is increased to 1.9° with an increment of 70% after the laser softening heat treatment.

    2019 Journal of Theoretical and Applied Physics
    The present study focuses on the structural and electrical properties of doped zinc–lead iodide (Zn–PbI2) as-deposited film. Lead iodide (PbI2) nanostructure was successfully prepared by thermal evaporation method on a glass substrate at room temperature. The analysis, characterization, and structural properties of PbI2 were achieved using X-ray diffraction (XRD) and scanning electron microscopy. The PbI2 was polycrystalline and had a hexagonal structure as proved using XRD. The measured values are in agreement with other experimental and theoretical data. Furthermore, the present research studied the effect of doping on the physical properties of lead iodide with zinc dopants at different weights (0.02, 0.04, 0.06, and 0.08) mg. The electrical properties of the fabricated metal–semiconductor–metal photodetector based on PbI2 and Pb1−xZnxI2 layers prepared on glass substrates by thermal

    2021 Brazilian Journal of Physics
    Pulse laser ablation is the most effective technique as it can be carried out within a spotless and well-regulated setting which eventually produces ultrapure nanoparticles. Several factors affect the formation of nanoparticles regarding size when the laser ablation technique is utilized. Primary factors include both physical parameters (fluency of laser, pulse durations, time of irradiation, wavelength and rate of repetition) as well as chemical parameters (fluid type and solid target size). When the energy density was elevated to the optimum rate, it led to growth in nanoparticle production. Additionally, the findings revealed that variation of solid target needed diverse optimum pulse durations and irradiation time to produce small and narrowly sized distributions of nanoparticles. The most frequent pulse duration was a few nanoseconds. Moreover, the study revealed that the nanoparticle size of colloids is controllable through shifting the wavelength from the fundamental harmonic up to the 4th harmonic (1064 to 266 nm). The wavelength of 532 nm is most widely utilized in preparing nanoparticles with optimal size and shape. The pulse repetition rate was proved to altering the average size of target nanoparticles. Meanwhile, the most frequently used pulse repetition rate was 10 Hz. Finally, it is important to simultaneously realize the optimum working conditions and optimum values of the whole parameters in order to succeed in ablating material in the form of particulates, atoms, and ions as well as to achieve the optimum synthesis of nanoparticl

    2022 Journal of Engineering and Applied Science
    Laser drilling on polymers has many applications in various industries, such as sensors, aerospace, medical devices, and microelectronics. In this research, a CO2 laser machine was employed for micro-drilling PC samples. Design–Expert analysis was applied to understand the laser drilling process better. Based on a Box–Behnken design (BBD) of the experimental software, 17 experiments were designed to examine the laser parameters’ influence on the micro-drilling process. The impact of parameters, such as power (P), exposure time (t), and focal plane position (FPP), on the depth, entry diameter, and heat-affected zone (HAZ) was investigated using analysis of variance (ANOVA). Quadratic regression models were applied to model different hole factors throughout the process. The experiments were optimized using the developed objective model as a function to attain the best hole. The outcomes revealed that a full hole with a 351-μm diameter and 102-μm HAZ was obtained at 0 FPP, with a laser power of 4 W, and at 0.15 s. To conduct virtual tests alongside the experimental study, simulation of the drilling mechanism’s temperature distribution was achieved via the COMSOL Multiphysics program. The simulation’s refined accuracy was able to predict the hole’s geometry and presented outcomes that favorably corresponded with the experimental results. A numerical optimization technique was used to generate an ideal hole by minimizing or maximizing the objective function, achieving full holes of 350-μm diameter and 90-μm HAZ, obtained at 0 FPP, with 3.6 W, and at 0.1 s.

    2017 MATEC Web of Conferences
    Laser tube bending is a new technique of laser material forming to produce a complex and accurate shape due to its flexibility and high controllability. Moreover, the defects during conventional tube forming such as thinning, wrinkling, spring back and ovalization can be avoided in laser tube bending process, because there is no external force used. In this paper an analytical investigation has been conducted to analyses the effects of average laser power and laser scanning speed on laser tube bending process, the analytical results have been verified experimentally. The model used in this study is in the same trend of the experiment. The results show that the bending angle increased with the increasing of average laser power and decreased with the increasing of angular scanning speed.

    2018 Journal of Lasers, Optics & Photonics
    Abstract Laser forming of materials can help produce the desired shapes from sheets or tubes, which is not possible through conventional methods. Molds, dies, and external force are not needed for the laser forming of materials. Furthermore, the process is flexible and can be controlled by making changes to the materials, their geometry, and the laser parameters, either individually or in combination with each other. Investigations into laser tube bending are scarce in the literature pertaining to this field of study despite its potential and industrial importance. In contrast, much research has been conducted on laser sheet forming, which employs the same mechanism. In this study, laser tube bending is compared with laser sheet forming in order to develop a better understanding of the laser forming process. This review elucidates upon the mechanisms employed in laser forming (in general) and laser tube bending (in particular). A number of investigation methods are reviewed and analytical models of the process are also described. The principle of laser tube bending is explained, and the influence of various parameters (such as materials, geometry, laser, edge, and cooling effects) on the process is analyzed. Additionally, large tubes bending and preloading, or laser assistance, are examined.