Study on High-Precision Computer-Controlled Aspheric Surface Processing Techniques

2011 ◽  
Vol 314-316 ◽  
pp. 1750-1753
Author(s):  
Chuan Zhang ◽  
Ping Wang ◽  
Yao Long Chen
Keyword(s):  
High Precision ◽  
Processing Technology ◽  
Surface Grinding ◽  
Aspheric Surface ◽  
Optical Surface ◽  
Surface Processing ◽  
Traditional Technique ◽  
Accuracy Of Measurement ◽  
Computer Controlled ◽  
Processing Techniques

In this paper, two processing techniques—full parameters technique and part parameters technique—for aspheric surface grinding are expatiated. Both of them are based on the priciple of computer-controlled optical surface (CCOS) and developed from trajectory forming method. We also have carried out appropriative software to digitalize processing technology. Proved by practical process, both of them are reliable and reproducible. Full parameters technique is easy to operate, but the accuracy of surface is to large extent dependent on the accuracy of measurement; Part parameters technique can avoid these measurements, however, it has certain requirements for operator. However, its requirements are still much less than those of traditional technique.

Ultra-high-precision surface processing techniques for nanofocusing ellipsoidal mirrors in hard x-ray region

2014 ◽  
Author(s):  
Hirokatsu Yumoto ◽  
Takahisa Koyama ◽  
Satoshi Matsuyama ◽  
Kazuto Yamauchi ◽  
Haruhiko Ohashi
Keyword(s):  
High Precision ◽  
Surface Processing ◽  
X Ray ◽  
Processing Techniques

Digital differential hysteresis iimage processing displays what the microscope acquires but the eye can't see

1995 ◽  
Vol 53 ◽  
pp. 642-643
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
Image Processing ◽  
Visual System ◽  
High Precision ◽  
Image Data ◽  
Processing Technology ◽  
Output Data ◽  
Contrast Resolution ◽  
Pixel Intensity ◽  
Data Reading ◽  
Hysteresis Properties

Differential hysteresis processing is a new image processing technology that provides a tool for the display of image data information at any level of differential contrast resolution. This includes the maximum contrast resolution of the acquisition system which may be 1,000-times higher than that of the visual system (16 bit versus 6 bit). All microscopes acquire high precision contrasts at a level of <0.01-25% of the acquisition range in 16-bit - 8-bit data, but these contrasts are mostly invisible or only partially visible even in conventionally enhanced images. The processing principle of the differential hysteresis tool is based on hysteresis properties of intensity variations within an image.Differential hysteresis image processing moves a cursor of selected intensity range (hysteresis range) along lines through the image data reading each successive pixel intensity. The midpoint of the cursor provides the output data. If the intensity value of the following pixel falls outside of the actual cursor endpoint values, then the cursor follows the data either with its top or with its bottom, but if the pixels' intensity value falls within the cursor range, then the cursor maintains its intensity value.

scholarly journals Manufacturing and Characterization of Hybrid Bulk Voxelated Biomaterials Printed by Digital Anatomy 3D Printing

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 123
Author(s):  
Hyeonu Heo ◽  
Yuqi Jin ◽  
David Yang ◽  
Christopher Wier ◽  
Aaron Minard ◽  
...  
Keyword(s):  
High Precision ◽  
Soft Matter ◽  
Research Area ◽  
Experimental Models ◽  
Effective Density ◽  
Practical Applications ◽  
3D Printers ◽  
Processing Techniques ◽  
Complex Surgical Procedures ◽  
Digital Anatomy

The advent of 3D digital printers has led to the evolution of realistic anatomical organ shaped structures that are being currently used as experimental models for rehearsing and preparing complex surgical procedures by clinicians. However, the actual material properties are still far from being ideal, which necessitates the need to develop new materials and processing techniques for the next generation of 3D printers optimized for clinical applications. Recently, the voxelated soft matter technique has been introduced to provide a much broader range of materials and a profile much more like the actual organ that can be designed and fabricated voxel by voxel with high precision. For the practical applications of 3D voxelated materials, it is crucial to develop the novel high precision material manufacturing and characterization technique to control the mechanical properties that can be difficult using the conventional methods due to the complexity and the size of the combination of materials. Here we propose the non-destructive ultrasound effective density and bulk modulus imaging to evaluate 3D voxelated materials printed by J750 Digital Anatomy 3D Printer of Stratasys. Our method provides the design map of voxelated materials and substantially broadens the applications of 3D digital printing in the clinical research area.

Burrless Surface Processing Technology

2016 ◽  
Author(s):  
Takamichi Hirasawa ◽  
Michihiro Yamamoto
Keyword(s):  
Processing Technology ◽  
Surface Processing

Dressing of diamond grinding wheels by abrasive water jet for freeform optical surface grinding

2014 ◽  
Author(s):  
Wei Wang ◽  
Peng Yao ◽  
Chengwu Li ◽  
Chuanzhen Huang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Water Jet ◽  
Surface Grinding ◽  
Abrasive Water Jet ◽  
Optical Surface ◽  
Grinding Wheels ◽  
Diamond Grinding

Form Accuracy of Optical Mould Inserts Made from Rapidly Solidified Aluminium Alloys

2015 ◽  
Vol 828-829 ◽  
pp. 62-68
Author(s):  
Khaled Abou-El-Hossein
Keyword(s):  
High Precision ◽  
Surface Finish ◽  
Single Point ◽  
Cutting Parameters ◽  
Diamond Turning ◽  
Machining Parameters ◽  
Optical Surface ◽  
Form Accuracy ◽  
Optical Surfaces ◽  
Rapidly Solidified

Plastic optical components and lenses produced in mass quantities are usually manufactured using high-precision plastic injection technology. For that, high-precision plastic moulds with aluminium optical inserts made with extremely high dimension accuracy and high optical surface quality are used. Ultra-high precision single-point diamond turning have been successfully used in shaping optical mould inserts from various aluminium grades such as traditional 6061. However, extreme care should be taking when selecting machining parameters in order to produce optically valid surfaces before premature tool wear takes place especially when the machined optical materials has inadequate machining database. The current experimental study looks at the effect of cutting conditions on optical surfaces made from aluminium. The study embarks on helping establish some diamond machining database that helps engineers select the most favourable cutting parameters. The papers reports on the accuracy and surface finish quality received on an optical surface made on mould inserts from a newly developed aluminium alloy. Rapidly solidified aluminium (RSA) grades have been developed recently to address the various problems encountered when being cut by single-point diamond turning operation. The material is characterised by its extremely fine grained microstructure which helps extend the tool life and produce optical surfaces with nanometric surface finish. It is found the RSA grades can be successfully used to replace traditional optical aluminium grades when making optical surfaces. Surface finishes of as low as 10 nanometres and form accuracy of less than one micron can be achieved on RSA.

Construction and Validation of a Complaint Model of the Cerebrospinal Fluid System With Fluid Filled Syrinx

2004 ◽  
Author(s):  
Bryn A. Martin ◽  
Wojciech Kalata ◽  
John N. Oshinski ◽  
Francis Loth ◽  
Thomas J. Royston
Keyword(s):  
Cerebrospinal Fluid ◽  
External Environment ◽  
Mri Imaging ◽  
Flow Waveform ◽  
Flow Conditions ◽  
Model Geometry ◽  
Computer Controlled ◽  
Processing Techniques ◽  
Flow Waveforms

A simplified model of the cerebrospinal fluid (CSF) system with compliant fluid filled syrinx has been constructed, tested, and verified to closely mimic the in-vivo flow conditions observed through MRI imaging of the pathological CSF system with syringomyelia. The model is subjected to a MRI derived CSF flow waveform from a patient with Syringomyelia through use of a computer controlled pulsatile pump. Model geometry, flow waveform, and spinal cord compliance are obtained at three axial locations along the system through MRI image processing techniques. MRI testing was conducted with the syrinx open and closed to the external environment. Results indicate that the internal and external flow waveforms were in opposite directions when the syrinx was closed and in unison when the syrinx was open. The observed flow waveform and compliance measurements closely mimicked the in-vivo case when the syrinx is open to the external environment.

The Research of Precision Detection System on Grade Rode Based on Image Processing Technology

2014 ◽  
Vol 556-562 ◽  
pp. 2591-2594
Author(s):  
Hui Feng Kang ◽  
Qian Qian Hou
Keyword(s):  
Image Processing ◽  
High Precision ◽  
Image Acquisition ◽  
Processing Technology ◽  
System Stability ◽  
Sensor System ◽  
Calibration System ◽  
Verification System ◽  
Image Processing Technology ◽  
Test Requirements

In this article, a level ruler Precision Verification System program of the mobile-camera image processing technology that is based on the camera mobile image processing technology is proposed, as a result of the research for the existing barcode type level ruler verification system and a high-precision grating sensor system hardware structure is also built. Secondly, we calculate the uncertainty of the system, and at last do the system stability test that the results show that the system achieves the test requirements. On the barcode type level existing ruler verification system research, proposed a camera mobile image processing technology based on the level ruler of precision calibration system, builds a detection sensor system with high precision grating, realizes automatic acquisition level ruler barcode image, method of application without barcode image with barcode image subtraction the preliminary processing of image acquisition, eliminate the influence of background light on the image acquisition, the uncertainty of the calibration system of the theoretical calculation and experimental verification, the results show that the system achieves the test requirements.

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