Contour Scanning Method With Inner Supports for Micro-Shell Structural Strengthening Strategy Based on Two-Photon Polymerization Technology

2019 ◽  
Author(s):  
Yu-Wen Tseng ◽  
Chao-Yaug Liao ◽  
Chin-Huang Tseng ◽  
Po-Kai Chen
Keyword(s):  
Laser Scanning ◽  
Structural Strength ◽  
Scanning Method ◽  
Planning Strategy ◽  
Two Photon ◽  
Scanning Path ◽  
Scanning Path Planning ◽  
Structure Collapse ◽  
Fabrication Time ◽  
Two Photon Polymerization

Abstract The traditional two-photon polymerization manufacturing technology encounters two difficulties in fabricating submillimeter/micron-scale structures: excessively long fabrication time and weak structural strength, causing collapse of the structure. To solve these problems, this research first develops a new laser scanning path planning strategy, namely, the contour scanning method with inner supports. The concept is to reduce the fabrication time by manufacturing only submillimeter/micron structural shells as well as to generate the support structure below the horizontal area of the shell to enhance the structural strength. In this study, a method for generating a laser scanning path is presented, and a simple micro-cuboid and a micro-calcaneus with complex shape are fabricated to verify the proposed method. The method can effectively reduce the fabrication time and prevent submillimeter/micron structure collapse.

scholarly journals Scaling laws of nanorods in two-photon polymerization nanofabrication using a continuous scanning method

AIP Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 105014 ◽  
Author(s):  
Jieqiong Lin ◽  
Xian Jing ◽  
Xiaoqin Zhou ◽  
Xu Zheng ◽  
Rui Gao ◽  
...  
Keyword(s):  
Scaling Laws ◽  
Scanning Method ◽  
Two Photon ◽  
Continuous Scanning ◽  
Two Photon Polymerization

scholarly journals Modal shape measurement of fiber-reinforced composite plate with high efficiency and precision based on laser linear scanning method

2018 ◽  
Vol 51 (9-10) ◽  
pp. 470-487 ◽  
Author(s):  
Hui Li ◽  
Yongle Chang ◽  
Zhonghao Xu ◽  
Qingyu Zhu ◽  
Bangchun Wen
Keyword(s):  
Composite Plate ◽  
Laser Scanning ◽  
High Efficiency ◽  
Modal Shape ◽  
Scanning Method ◽  
Fiber Reinforced Composite ◽  
Scanning Rate ◽  
Reinforced Composite ◽  
Scanning Path ◽  
Linear Scanning

The laser linear scanning method is proposed to measure the modal shape of fiber-reinforced composite thin plate with high efficiency and precision. First, by establishing the laser scanning frame model of the composite plate, the corresponding extraction principle of modal shape data and laser scanning rate selection criterion are explained in detail to clarify the theoretical principle of laser linear scanning method. The corresponding test procedure of modal shape, drawing method from the shape scanning data, and control method of the constant laser scanning rate are also proposed based on the developed laser linear scanning system. Then, a TC300 carbon fiber/resin composite thin plate is taken as a research object to verify the effectiveness and reliability of such a method, through comparing the results obtained by the traditional experimental modal method and finite element method. Moreover, the influences of constraint boundary condition, excitation level, laser scanning rate, scanning spacing, scanning path mode, the fiber angles, and fiber material damage on modal shape results are also discussed. It has been found that laser linear scanning method can improve test efficiency of modal shape of the composite plate with high preciseness. Except for scanning path mode, the other parameters have a major impact on each shape morphology, and their effects can be quantitatively analyzed by identifying the positions and clarity of nodal lines of each modal shape. Especially, the high-density modal shape results and their equal amplitude lines in different projection views can be used to determine whether or not the composite plate is damaged as well as its damaged degrees.

UAV Bridge Laser Scanning Path Planning Based on Coverage Path Arcs

2021 ◽  
Vol 58 (8) ◽  
pp. 0828003
Author(s):  
刘春磊 Liu Chunlei ◽  
张宏立 Zhang Hongli ◽  
王聪 Wang Cong
Keyword(s):  
Path Planning ◽  
Laser Scanning ◽  
Scanning Path ◽  
Scanning Path Planning

scholarly journals Printability of photo-sensitive nanocomposites using two-photon polymerization

2020 ◽  
Vol 9 (1) ◽  
pp. 418-426 ◽  
Author(s):  
Ka-Wai Yeung ◽  
Yuqing Dong ◽  
Ling Chen ◽  
Chak-Yin Tang ◽  
Wing-Cheung Law ◽  
...  
Keyword(s):  
Smart Materials ◽  
Laser Scanning ◽  
Laser Energy ◽  
Laser Writing ◽  
Multiwalled Carbon ◽  
Excessive Heat ◽  
Two Photon ◽  
Direct Laser ◽  
Micro Structures ◽  
Two Photon Polymerization

AbstractTwo-photon polymerization direct laser writing (TPP DLW) is an emerging technology for producing advanced functional devices with complex three-dimensional (3D) micro-structures. Tremendous efforts have been devoted to developing two-photon polymerizable photo-sensitive nanocomposites with tailored properties. Light-induced reconfigurable smart materials such as liquid crystalline elastomers (LCEs) are promising materials. However, due to the difficulties in designing two-photon polymerizable liquid crystal monomer (LCM) nanocomposite photoresists, it is challenging to fabricate true 3D LCE micro-structures. In this paper, we report the preparation of photo-sensitive LCE nanocomposites containing photothermal nanomaterials, including multiwalled carbon nanotubes, graphene oxide and gold nanorods (AuNRs), for TPP DLW. The printability of the LCE nanocomposites is assessed by the fidelity of the micro-structures under different laser writing conditions. DLW of GO/LCM photoresist has shown a vigorous bubble formation. This may be due to the excessive heat generation upon rapid energy absorption of 780 nm laser energy. Compared to pure LCM photoresists, AuNR/LCM photoresists have a lower laser intensity threshold and higher critical laser scanning speed, due to the high absorption of AuNRs at 780 nm, which enhanced the photo-sensitivity of the photoresist. Therefore, a shorter printing time can be achieved for the AuNR/LCM photoresist.

Measurement of erosion state and refractory lining thickness of blast furnace hearth by using three-dimensional laser scanning method

2020 ◽  
Vol 118 (1) ◽  
pp. 106
Author(s):  
Lei Zhang ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Guoli Jia ◽  
Jian Gong ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Laser Scanning ◽  
Refractory Lining ◽  
Three Dimensional ◽  
3D Laser Scanning ◽  
Scanning Method ◽  
Blast Furnace Production ◽  
Severe Erosion ◽  
Residual Thickness ◽  
Minimum Depth

The three-dimensional (3D) model of erosion state of blast furnace (BF) hearth was obtained by using 3D laser scanning method. The thickness of refractory lining can be measured anywhere and the erosion curves were extracted both in the circumferential and height directions to analyze the erosion characteristics. The results show that the most eroded positions located below 20# tuyere with an elevation of 7700 mm and below 24#–25# tuyere with an elevation of 8100 mm, the residual thickness here is only 295 mm. In the circumferential directions, the serious eroded areas located between every two tapholes while the taphole areas were protected well by the bonding material. In the height directions, the severe erosion areas located between the elevation of 7600 mm to 8200 mm. According to the calculation, the minimum depth to ensure the deadman floats in the hearth is 2581 mm, corresponding to the elevation of 7619 mm. It can be considered that during the blast furnace production process, the deadman has been sinking to the bottom of BF hearth and the erosion areas gradually formed at the root of deadman.

scholarly journals High-speed volumetric two-photon fluorescence imaging of neurovascular dynamics

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiang Lan Fan ◽  
Jose A. Rivera ◽  
Wei Sun ◽  
John Peterson ◽  
Henry Haeberle ◽  
...  
Keyword(s):  
Blood Flow ◽  
High Speed ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Laser Scanning Microscopy ◽  
Fluorescence Signal ◽  
Imaging Method ◽  
Spatiotemporal Resolution ◽  
Two Photon

AbstractUnderstanding the structure and function of vasculature in the brain requires us to monitor distributed hemodynamics at high spatial and temporal resolution in three-dimensional (3D) volumes in vivo. Currently, a volumetric vasculature imaging method with sub-capillary spatial resolution and blood flow-resolving speed is lacking. Here, using two-photon laser scanning microscopy (TPLSM) with an axially extended Bessel focus, we capture volumetric hemodynamics in the awake mouse brain at a spatiotemporal resolution sufficient for measuring capillary size and blood flow. With Bessel TPLSM, the fluorescence signal of a vessel becomes proportional to its size, which enables convenient intensity-based analysis of vessel dilation and constriction dynamics in large volumes. We observe entrainment of vasodilation and vasoconstriction with pupil diameter and measure 3D blood flow at 99 volumes/second. Demonstrating high-throughput monitoring of hemodynamics in the awake brain, we expect Bessel TPLSM to make broad impacts on neurovasculature research.

Pattern writing in a liquid-crystal-monomer mixture using two-photon polymerization

2013 ◽  
Author(s):  
Chandroth P. Jisha ◽  
Kuei-Chu Hsu ◽  
YuanYao Lin ◽  
Ja-Hon Lin ◽  
Chien-Chung Jeng ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Monomer Mixture ◽  
Two Photon ◽  
Two Photon Polymerization
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