Inspection Technology for F-Theta Lens: Practices and Discussions

2007 ◽  
Vol 364-366 ◽  
pp. 1191-1196 ◽  
Author(s):  
Hua Li ◽  
Suet To ◽  
Ling Bao Kong ◽  
Chi Fai Cheung ◽  
Wing Bun Lee
Keyword(s):  
Measurement Methods ◽  
Freeform Surface ◽  
Measurement Technology ◽  
Measuring Instruments ◽  
Freeform Surfaces ◽  
Existing Problems ◽  
Laser Scanners ◽  
Pros And Cons ◽  
Lens Surface

This paper presents the inspection technology for a freeform surface component which is named F-theta lens. F-theta lens is widely used in laser scanners, printers, etc. Freeform characterization is one of the main approaches to verify the manufacturing precision of freeform surface. At present, there is still a lack of techniques for the characterization of freeform surfaces. This study aimed to explore some approaches to inspect freeform surfaces. Two types of measurement methods, namely contact and non-contact measurement methods, are employed to measure the F-theta lens surface. The pros and cons, the existing problems, different applications and areas for improvement of the two methods are discussed. A series of advanced measuring instruments are used in the measurement process. A brief description of measurement mechanisms of these instruments is also presented. As a whole, this paper contributes to the development of the precision measurement technology for optical freeform surfaces.

The Analysis and Research about Temperature and Thermal Error Measurement Technology of CNC Machine Tool

2008 ◽  
Vol 392-394 ◽  
pp. 40-44 ◽  
Author(s):  
C. Xie ◽  
Werner Roddeck ◽  
Chun Shi Liu ◽  
Wei Min Zhang
Keyword(s):  
Machine Tool ◽  
Temperature Measurement ◽  
Technology Development ◽  
Thermal Error ◽  
Measurement Methods ◽  
Measurement Technology ◽  
Error Measurement ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Existing Problems

The existing problems of temperature measurement for CNC machine tool are pointed out through analyzing research results of temperature measurement methods, temperature measurement points optimum and temperature variables selection technology. The devices and properties of contact and non-contact temperature measurement are compared and evaluated. The error measurement devices and their technology development of CNC machine tool are described. The measurement methods and results of temperature and error are analyzed by testing on a concrete CNC machine tool. It is concluded that some objective rules exist in various machine tools. The locations of sensitive points for temperature and errors as well as its number can be defined.

scholarly journals Generation and characterization of ultra-precision compound freeform surfaces

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041988011
Author(s):  
Lingbao Kong ◽  
Yingao Ma ◽  
Mingjun Ren ◽  
Min Xu ◽  
Chifai Cheung
Keyword(s):  
Tool Path ◽  
Complex Geometry ◽  
Experimental Studies ◽  
Machining Process ◽  
Freeform Surface ◽  
Freeform Surfaces ◽  
Machining Errors ◽  
Hybrid Machining Process ◽  
Ultra Precision

Compound freeform surfaces are widely used in bionic and optical applications. The manufacturing and measurement of such surfaces are challenging due to the complex geometry with multi-scale features in a high precision level with sub-micrometer form accuracy and nanometer surface finish. This article presents a study of ultra-precision machining and characterization of compound freeform surfaces. A hybrid machining process by combining slow slide servo and fast tool servo is proposed to machine compound freeform surfaces. The machining process for this hybrid tool servo is explained, and tool path generation is presented. Then, a normal template-based matching and characterization method is proposed to evaluate such compound freeform surfaces. Experimental studies are undertaken to machine a compound freeform surface using the proposed method based on a four-axis ultra-precision machine tool. The machined compound freeform surface is also measured and characterized by the proposed analysis and characterization method. The experimental results are presented, and the machining errors for compound freeform surfaces are also discussed.

Study on Profile-Adaptive Tool System for Small Robots in Large Freeform Surface Polishing

2010 ◽  
Vol 37-38 ◽  
pp. 1327-1331
Author(s):  
Qi Tong Liu ◽  
Jian Ming Zhan ◽  
Jian Hua Mao
Keyword(s):  
Freeform Surface ◽  
Polishing Process ◽  
Processing Efficiency ◽  
Kinematic Equation ◽  
Freeform Surfaces ◽  
Surface Polishing ◽  
Adaptive Tool

An adaptive tool system of polishing robots for large freeform surface which is installed discoid tool is proposed. To improve processing efficiency, the mechanical of adaptive tool system adjust to curvature changing of large freeform surface is designed. Adaptability of the processing is analyzed and simulated, and kinematic equation of tool system is established. The polishing process of large freeform surfaces with tool system is analyzed.

Optimization and experimental characterization of novel measurement methods for wide-band spectrum sensing in cognitive radio applications

Measurement ◽  
2016 ◽  
Vol 94 ◽  
pp. 585-601 ◽  
Author(s):  
Leopoldo Angrisani ◽  
Domenico Capriglione ◽  
Gianni Cerro ◽  
Luigi Ferrigno ◽  
Gianfranco Miele
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Wide Band ◽  
Measurement Methods ◽  
Band Spectrum ◽  
Experimental Characterization

Updating the ANSI Standard on Measurement of Exhaust Emissions

1994 ◽  
Author(s):  
J. M. Vaught
Keyword(s):  
Gas Turbine ◽  
Exhaust Emissions ◽  
Measurement Methods ◽  
National Standards ◽  
Turbine Engines ◽  
Measurement Technology ◽  
Gas Turbine Engines ◽  
Regulatory Requirements ◽  
Industrial Gas Turbine ◽  
Selection Of

The American National Standards Institute (ANSI) required that the source testing Standard on Measurement of Exhaust Emissions from Stationary Gas Turbine Engines, B133.9, be brought up to date with today’s regulatory requirements and best measurement technology. The criteria for the design of the Standard along with its content and format are discussed. The selection of measurement methods for gaseous components, smoke, and particulates emitted by present day emission controlled industrial gas turbine engines is presented.

Characterization of “Stickies” Polymeric Contaminants in Recycle Pulp Slurries by Optical Fluorescence and Scanning Electron Microscopy.

1997 ◽  
Vol 3 (S2) ◽  
pp. 1247-1248
Author(s):  
R. M. Fisher ◽  
J. Holbery ◽  
Barbara Reine
Keyword(s):  
Electron Microscopy ◽  
Fine Particles ◽  
Polymeric Materials ◽  
Measuring Instruments ◽  
Paper Machine ◽  
X Ray ◽  
Optical Fluorescence ◽  
Thermal Analysis Techniques ◽  
Physical And Chemical

A major problem now hampering increased recycling of old cardboard containers (OCC), is the presence of significant amounts of polymeric materials such as adhesives, tapes, labels and wax which enter the pulp process stream along with the cardboard and paper that was collected for recycling. Many of these materials contain very fine particles of inorganic fillers and pigments. These various contaminant constituents combine in some, as yet unknown, manner to form an extremely gummy material that deposits on paper machine surfaces and sticks tenaciously (hence the term “Stickies”). The sticky blobs are very difficult to remove and increases machine downtime and maintenance costs as well as causing blemishes on the finished container board product Light optical image analysis, UV fluorescence, FTIR and electron microscopy are being used in consort with particle size measuring instruments, TGS and DSC thermal analysis techniques, FTIR infra-red spectroscopy as well as XRF (x-ray fluorescence spectroscopy ), XPS (x-ray photo emission spectroscopy) and classical contact angle determination methods as part of a broad program to characterize the physical and chemical nature of stickies in pulp slurries with the goal of removing them or alleviating their pronounced tendency to deposit on machinery and paper products.

scholarly journals Al-Based Nano-Sized Composite Energetic Materials (Nano-CEMs): Preparation, Characterization, and Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1039 ◽  
Author(s):  
Weiqiang Pang ◽  
Xuezhong Fan ◽  
Ke Wang ◽  
Yimin Chao ◽  
Huixiang Xu ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Recent Progress ◽  
Functional Materials ◽  
Research Field ◽  
Preparation Methods ◽  
Existing Problems ◽  
And Performance ◽  
Future Work ◽  
Application Prospects

As one of the new types of functional materials, nano-sized composite energetic materials (nano-CEMs) possess many advantages and broad application prospects in the research field of explosives and propellants. The recent progress in the preparation and performance characterization of Al-based nano-CEMs has been reviewed. The preparation methods and properties of Al-based nano-CEMs are emphatically analyzed. Special emphasis is focused on the improved performances of Al-based nano-CEMs, which are different from those of conventional micro-sized composite energetic materials (micro-CEMs), such as thermal decomposition and hazardous properties. The existing problems and challenges for the future work on Al-based nano-CEMs are discussed.

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