"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.

Evaluation of Parts Produced by a Novel Additive Manufacturing Process

2013 ◽  
Vol 315 ◽  
pp. 63-67 ◽  
Author(s):  
Muhammad Fahad ◽  
Neil Hopkinson
Keyword(s):  
Additive Manufacturing ◽  
Rapid Prototyping ◽  
Manufacturing Process ◽  
High Speed ◽  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Layer By Layer ◽  
Nylon 12 ◽  
Measuring Machine ◽  
End Use

Rapid prototyping refers to building three dimensional parts in a tool-less, layer by layer manner using the CAD geometry of the part. Additive Manufacturing (AM) is the name given to the application of rapid prototyping technologies to produce functional, end use items. Since AM is relatively new area of manufacturing processes, various processes are being developed and analyzed for their performance (mainly speed and accuracy). This paper deals with the design of a new benchmark part to analyze the flatness of parts produced on High Speed Sintering (HSS) which is a novel Additive Manufacturing process and is currently being developed at Loughborough University. The designed benchmark part comprised of various features such as cubes, holes, cylinders, spheres and cones on a flat base and the build material used for these parts was nylon 12 powder. Flatness and curvature of the base of these parts were measured using a coordinate measuring machine (CMM) and the results are discussed in relation to the operating parameters of the process.The result show changes in the flatness of part with the depth of part in the bed which is attributed to the thermal gradient within the build envelope during build.

scholarly journals High-resolution 4-D acquisition of freely swimming human sperm cells without staining

2020 ◽  
Vol 6 (15) ◽  
pp. eaay7619 ◽  
Author(s):  
Gili Dardikman-Yoffe ◽  
Simcha K. Mirsky ◽  
Itay Barnea ◽  
Natan T. Shaked
Keyword(s):  
Refractive Index ◽  
High Resolution ◽  
Sperm Cell ◽  
High Speed ◽  
Three Dimensional ◽  
Human Sperm ◽  
Refractive Index Profile ◽  
Sperm Cells ◽  
Biological Assays ◽  
Natural Movement

We present a new acquisition method that enables high-resolution, fine-detail full reconstruction of the three-dimensional movement and structure of individual human sperm cells swimming freely. We achieve both retrieval of the three-dimensional refractive-index profile of the sperm head, revealing its fine internal organelles and time-varying orientation, and the detailed four-dimensional localization of the thin, highly-dynamic flagellum of the sperm cell. Live human sperm cells were acquired during free swim using a high-speed off-axis holographic system that does not require any moving elements or cell staining. The reconstruction is based solely on the natural movement of the sperm cell and a novel set of algorithms, enabling the detailed four-dimensional recovery. Using this refractive-index imaging approach, we believe that we have detected an area in the cell that is attributed to the centriole. This method has great potential for both biological assays and clinical use of intact sperm cells.

Optical scanning holography as a technique for high-resolution three-dimensional biological microscopy

2002 ◽  
Vol 19 (9) ◽  
pp. 1910 ◽  
Author(s):  
Jim Swoger ◽  
Manuel Martı́nez-Corral ◽  
Jan Huisken ◽  
Ernst H. K. Stelzer
Keyword(s):  
High Resolution ◽  
Three Dimensional ◽  
Optical Scanning ◽  
Optical Scanning Holography

Error Analysis of the ATOS 3D Optical Scanner in Vehicle Measurement

2013 ◽  
Vol 365-366 ◽  
pp. 654-657
Author(s):  
Xue Dong Xie ◽  
Wei Ling Zhao
Keyword(s):  
Measurement System ◽  
Reference Point ◽  
High Speed ◽  
Three Dimensional ◽  
High Accuracy ◽  
Actual Measurement ◽  
Optical Scanning ◽  
Optical Scanner ◽  
Actual Use ◽  
Multiple Scan

ATOS three-dimensional optical scanner is one of the most advanced technologically three-dimensional optical scanning devices. It can automatically put together the multiple scan view image by the reference point of the measurement system, with high accuracy, high speed Etc. It is widely used in automobiles. The paper combines with the experience in vehicle measurements, analysis the error cause in the actual use, points out ways to reduce or eliminate error. It has the great application value to actual measurement.

Cytoskeletal control of neuronal geometry: A serial EM analysis

1988 ◽  
Vol 46 ◽  
pp. 24-25
Author(s):  
John K. Stevens ◽  
Judy Trogadis
Keyword(s):  
High Resolution ◽  
High Speed ◽  
Three Dimensional ◽  
Video Camera ◽  
Electron Microscopic Level ◽  
Electron Microscopic ◽  
Direct Role ◽  
Live Image ◽  
Neuronal Geometry ◽  
Rotation Stage

The cytoskeleton plays a direct role in controlling neurite shape. To quantitatively study both the three dimensional shape and the sub-micron structure of the cytoskeleton requires complete serial reconstruction at the Electron Microscopic level. We have devised a computer reconstruction system specifically for this purpose.The system uses a 35mm film copy of 3.25 x 4.00 inch EM negative as the data source. The film is placed into a high speed film transport (15 frames/second), which is mounted on a X,Y and rotation stage controlled by stepping motors. The 35mm film is viewed through a stepping motor controlled zoom lens mounted on a high resolution (1119 x 1024) video camera. A high resolution frame grabber controlled by the computer can store one complete frame. Thus, the live image and a stored image may be displayed alternately on a high resolution monitor. Finally, a graphics overlay and mouse connected to the computer can be used to align successive sections via the stepping motors, as well as to trace the outlines of a profile, or of a microtubule.

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