High-speed, high-resolution, and large-scanning-range three-dimensional optical measurement system using a wavelength-tunable orthogonally polarized ultrashort twin pulse source

2009 ◽  
Vol 27 (1) ◽  
pp. 141 ◽  
Author(s):  
Takefumi Ohta ◽  
Norihiko Nishizawa ◽  
Tetsuya Ozawa ◽  
Kazuyoshi Itoh
Keyword(s):  
High Resolution ◽  
Measurement System ◽  
High Speed ◽  
Optical Measurement ◽  
Three Dimensional ◽  
Pulse Source ◽  
Optical Measurement System ◽  
Wavelength Tunable ◽  
Scanning Range

scholarly journals Experimental comparison of a macroscopic draping simulation for dry non-crimp fabric preforming on a complex geometry by means of optical measurement

2016 ◽  
Vol 51 (16) ◽  
pp. 2363-2375 ◽  
Author(s):  
Annegret Mallach ◽  
Frank Härtel ◽  
Frieder Heieck ◽  
Jan-Philipp Fuhr ◽  
Peter Middendorf ◽  
...  
Keyword(s):  
Measurement System ◽  
Complex Geometry ◽  
Optical Measurement ◽  
Three Dimensional ◽  
Detailed Comparison ◽  
Experimental Comparison ◽  
Three Dimensional Model ◽  
Blank Holder ◽  
Optical Measurement System ◽  
Set Up

Scope of the presented work is a detailed comparison of a macroscopic draping model with real fibre architecture on a complex non-crimp-fabric preform using a new robot-based optical measurement system. By means of a preliminary analytical process design approach, a preforming test centre is set up to manufacture dry non-crimp-fabric preforms. A variable blank holder setup is used to investigate the effect of different process parameters on the fibre architecture. The real fibre architecture of those preforms is captured by the optical measurement system, which generates a three-dimensional model containing information about the fibre orientation along the entire surface of the preform. The measured and calculated fiber orientations are then compared with the simulation results in a three-dimensional overlay file. The results show that the analytical approach is able to predict local hot spots with high shear angles on the preform. Macroscopic simulations show a higher sensitivity towards changes in blank holder pressure than reality and limit the approach to precisely predict fibre architecture parameters on complex geometries.

scholarly journals Alignment Method of an Axis Based on Camera Calibration in a Rotating Optical Measurement System

2020 ◽  
Vol 10 (19) ◽  
pp. 6962
Author(s):  
Yanli Hou ◽  
Xianyu Su ◽  
Wenjing Chen
Keyword(s):  
Camera Calibration ◽  
Measurement System ◽  
Optical Measurement ◽  
Ccd Camera ◽  
Least Square ◽  
Optical Center ◽  
External Parameter ◽  
Optical Measurement System ◽  
Rotation Center ◽  
Projection Center

The alignment problem of a rotating optical measurement system composed of a charge-coupled device (CCD) camera and a turntable is discussed. The motion trajectory model of the optical center (or projection center in the computer vision) of a camera rotating with the rotating device is established. A method based on camera calibration with a two-dimensional target is proposed to calculate the positions of the optical center when the camera is rotated by the turntable. An auxiliary coordinate system is introduced to adjust the external parameter matrix of the camera to map the optical centers on a special fictitious plane. The center of the turntable and the distance between the optical center and the rotation center can be accurately calculated by the least square planar circle fitting method. Lastly, the coordinates of the rotation center and the optical centers are used to provide guidance for the installation of a camera in a rotation measurement system. Simulations and experiments verify the feasibility of the proposed method.

"ON-AXIS" LINEAR FOCUSED SPOT SCANNING MICROSTEREOLITHOGRAPHY SYSTEM: OPTOMECHATRONIC DESIGN, ANALYSIS AND DEVELOPMENT

2013 ◽  
Vol 12 (01) ◽  
pp. 43-68 ◽  
Author(s):  
PRASANNA GANDHI ◽  
SUHAS DESHMUKH ◽  
RAHUL RAMTEKKAR ◽  
KIRAN BHOLE ◽  
ALEM BARAKI
Keyword(s):  
High Resolution ◽  
System Integration ◽  
High Speed ◽  
Mechanical Design ◽  
Three Dimensional ◽  
Layer By Layer ◽  
Optical Scanning ◽  
High Production Rate ◽  
High Production ◽  
Scanning Mechanism

Microstereolithography (MSL) is technology of fabrication of three-dimensional (3D) components by using layer-by-layer photopolymerization. Typical design goals of MSL system are: small features, high resolution, high speed of fabrication, and large overall size of component. This paper focuses on design and development of such a system to meet these optomechatronic requirements. We first analyze various optical scanning schemes used for MSL systems along with the proposed scheme via optical simulations and experiments. Next, selection criteria for various subsystems are laid down and appropriate design decisions for the proposed system are made. Further, mechanical design of the scanning mechanism is carried out to meet requirements of high speed and resolution. Finally, system integration and investigation in process parameters is carried out and fabrication of large microcomponent with high resolution is demonstrated. The proposed system would be useful for fabrication of multiple/large microcomponents with high production rate in various applications.

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