Готові списки джерел за темами / High-speed printing machinery

Добірка наукової літератури з теми "High-speed printing machinery"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "High-speed printing machinery"

Liao, Yong Hong. "Printed-Electronic PCB Circuit Inkjet Printing Control and Detection System." Advanced Materials Research 457-458 (January 2012): 1163–68. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.1163.

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Анотація:

Printed electronic technology is focus in industry as an efficient, low consumption, energy saving, environmentally friendly technology. Ink-jet printing technology is the core of fully printed electronic technology. This article design a Printed electronic Assembly line system consisted of Fixed inkjet array, which can Implement high-speed inkjet printing. It Adopt the print driver architecture In accordance with WDM models which cross kernel and user level. Embedded with electronic circuit design software systems, the electronic circuit design is directly printed to PCB. Interlaced Fixed Multi-inkjet Has parallel high-speed printing features, reduce assembly line machinery vibration, simplify electromechanical servo systems, improve the accuracy of printing. The Design Consist of sections of PCB Positioning, Image servo, Matching printing and Quality detection.

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Xu, Qian Qian, Hai Yan Zhang, He Ping Hou, and Zhuo Fei Xu. "Fault Diagnosis Method of Offset Printer Feeding Mechanism Based on Kernel Principal Component Analysis and K-Means Clustering." Applied Mechanics and Materials 731 (January 2015): 395–400. http://dx.doi.org/10.4028/www.scientific.net/amm.731.395.

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The printing machine is a sort of large-scale equipment characterized by high speed and precision. A fault diagnosis method based on kernel principal component analysis (KPCA) and K-means clustering is developed to classify the types of feeding fault. The multidimensional and nonlinear data of printed image could be reduced by KPCA to make up the deficiency of the traditional K-means clustering method. In this paper, it is experimentally verified that the classification accuracy of the combined method is higher than the traditional clustering analysis method in feeding fault detection and diagnosis. This method provides a shortcut for the determination of fault sources and realizes multi-faults diagnosis of printing machinery efficiently

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Deng, Wei, Ming Lu, Guo Liang Lu, Zhong Qing Cui, and Xiao Qiang Yang. "The Development of Fault Diagnosis Expert System for High Speed Construction Machinery Based on Portable Data Terminal." Advanced Materials Research 301-303 (July 2011): 1178–82. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1178.

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To overcome the difficulty of field fault diagnosis in the complicated circumstance of construction machinery, the distributed expert system of fault diagnosis is developed in this paper. According to the technical requirements, the hardware platform based on smart industrial portable data terminal is performed. Meanwhile, the modular software of the fault diagnosis expert system is implemented. Its hardware is mainly composed of intelligent portable field testing unit as well as the central control computer. The software platform mainly consists of PDA modules for field fault testing and diagnosis, expert system module, maintenance support and data query module, training module, help module and report printing module. The work has greatly enhanced the capability of field fault detection, diagnosis and maintenance support in military units.

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Evans, D., and C. J. Spicer. "Advances in High-Speed Phosphor Printing." Proceedings of the Institution of Mechanical Engineers, Part B: Management and engineering manufacture 201, no. 2 (May 1987): 85–90. http://dx.doi.org/10.1243/pime_proc_1987_201_050_02.

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The development of the optical character reading (OCR) machine for high-speed code marking and sortation of letter mail has led to the need for a high-speed method of printing the phosphorescent code marks used by the mechanised letter sorting machines. This paper looks at the requirements for the printing system, the method adopted and the results achieved.

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Someya, Hisashi. "Felt Design for High Speed Printing Machines." JAPAN TAPPI JOURNAL 54, no. 5 (2000): 633–40. http://dx.doi.org/10.2524/jtappij.54.633.

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Tang, Wan You, Zhen Rong Wang, and Rui Xue Jiang. "Research of Picture Adaptive Processing for Packaging Printing Online Detection." Applied Mechanics and Materials 469 (November 2013): 368–71. http://dx.doi.org/10.4028/www.scientific.net/amm.469.368.

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In the process of printing machines increasing and reduction of speed, the image collected from online detection system for different speed of printing needs picture adaptive processing. In this paper, there are two methods put forward to realize above goal. One method is sequential similarity detection algorithms and the other is ratio value. Apply with VC++ programming to realize image matching on the premise of the unique CCD detection equipment. The experiment results show that: sequential similarity algorithm on the premise of printing machine running in low speed, by comparing with threshold to realize variable-speed imaging. The ratio value method can be used for a variety of printing speed and it has high speed, high detection efficiency and wide range of application.

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Wang, Yi Ming, Bang She Chen, Yan Li, and Shao Hua Zhang. "Research on Dynamic Design Method Based on Measuring Information for Printing Press." Advanced Materials Research 174 (December 2010): 290–94. http://dx.doi.org/10.4028/www.scientific.net/amr.174.290.

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Анотація:

Printing machinery’s reliability is one of the most important index parameter and good dynamic characteristics are essential for high speed printing press. The dynamic characteristic is predictable for printing machine with dynamic design. With the complexity of printing technique and printing machine, information, such as load on components is lack, leading to the difficulty of dynamic model solving and further more the dynamic parameters needs to be verified. Firstly, according to the dynamic design method, a dynamic design process based on measuring information for printing machine was put forward. Secondly, on the basis of principle and structure analysis to typical printing machine, dynamic characteristics measurement item and method was determined. With a wallboard of a two-color offset press acting as an example, the utilizing method was illustrated through dynamic modeling, theoretical model analysis, experiment model analysis based on vibration measurement and comparing the theoretical and experimental results. Finally, a Dynamic Design Assistant Platform based Vibration Measurement for Printing Machine was developed and had been used in 10 kinds of printing machine measurement and analysis. The conclusion shows that the tolerance of the theoretical model analysis results and experiment results is allowed. A new approach for new printing machine design and optimal design for existed printing machine is given.

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Almy, Raeshifa Diani, and Alva Edy Tontowi. "THE EFFECT OF 3D PRINTING MACHINE PARAMETERS IN EXTRUSION PROCESS OF BIOCOMPOSITE MATERIALS (PMMA AND HA) ON DIMENSIONAL ACCURACY." SINERGI 22, no. 2 (June 27, 2018): 83. http://dx.doi.org/10.22441/sinergi.2018.2.003.

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Bone implants are medical procedures involving replacement or reconstruction of missing or damaged bones with the patient's ones, natural substitutes or artificial substitutes. The widely used bone cement is a polymethylmethacrylate (PMMA) based composite material. To improve bioactivity, PMMA is combined with hydroxyapatite (HA). The manual formation can make bone implants during surgery. However, the method requires a longer operation time and raises the possibility of a higher error. Therefore, 3D printing technology is used to improve the quality of bone implants. One of the machines that can be used is the 3D printing machine, the property of the Product Design and Development Laboratory of Universitas Gadjah Mada. This machine needs to be tested to determine the accuracy of the prints, which is one indicator of product quality. Several machine parameters can be set in this machine setting. This study aims to determine the effect of three parameters, those are perimeter speed or edge print speed (20-40 mm / s), infill speed or inner print speed (50 - 70 mm / s), and fill angle or inner slope of inner printing (45 - 90 ° C). Before printing complex shapes, the machine was tested in advance with a more straightforward specimen design, which is a specimen design of flexural strength test. Response surface experiment design is used to determine the effect of three parameters on the dimensional accuracy which is measured through dimensional error. The results show that these three factors have no significant impact on the dimensional error, but the resulting error is still high. Therefore, it is necessary to adjust the design size before printing.

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Yuan, Ying Cai, Yi Lun Liu, and Yan Li. "Optimization Design of the Web Press’s Fold Mechanism Based on Robustness." Advanced Materials Research 174 (December 2010): 277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.174.277.

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Анотація:

With the increasing of printing machine’s working speed, the minor changes of design variables will decrease mechanical precision and stability in working state. So, high-speed and high stability are the tow mutual restraint aspects in modern printing machine design. The web press is the highest printing speed and large-scale with, but the stability of fold mechanism is the most significant constraints to speed. In order to increase the mechanism speed and stability, the two robust criterions, kinematics and dynamics precision, has been proposed. Through the kinetic analysis to the fold mechanism of web press, the dynamic model of the mechanism response to design variables has been established. By the model, the optimization model has been established based on robust analysis. Through the robust model, seeking the design variables with the best robustness，the goal of increasing the mechanical long-term stability in high speed can be attached in the condition of ensuring the fold precision. The design example shows that in the case of the stable design variables, the kinematics performances of robust design and trace optimization design are slightly different , but the dynamic performances of robust design are much better than that of trace optimization, and in the case of the design variables’ slight changes, robust design can make the mechanism’s dynamic performances still maintain, but the trace optimization doesn’t. In short, robust design is a good way to increase the stability of machine.

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Ngu, S. S., L. C. Kho, T. P. Tan, and M. Anyi. "A Novel Design of Tube Printing Machine." Applied Mechanics and Materials 315 (April 2013): 35–39. http://dx.doi.org/10.4028/www.scientific.net/amm.315.35.

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This paper reports on the design process necessary for an automatic tube printing machine and the issues concerned with high speed and high productivity tube printing. In the paper a detailed description is put forward for the mechanical system design of the machine. The processes necessary to make the design successful are outlined and the 3D model is carried out using CAD software. The electrical design of the tube printing machine is put forward to illustrate the wiring and electronic/electrical components of the machine.

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Більше джерел

Дисертації з теми "High-speed printing machinery"

Stagnaro, Adam. "Design and development of a roll-to-roll machine for continuous high-speed microcontact printing." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46479.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.
Includes bibliographical references (leaves 120-121).
Microcontact printing ([mu]CP) is an emerging technique for patterning micro-scale features for electronics, optics, surface modifications, and a variety of other applications. Its many advantages over traditional techniques like photolithography include lower cost, ability to pattern on non-planar surfaces, and compatibility with a variety of materials. Low production rates are one of the major limitations, as the process remains primarily a lab-scale technique at this point. Commercialization of the process depends on the development of innovative ways of applying the techniques to fast and flexible process paradigms. This thesis proposes the use of roll-to-roll techniques to increase the throughput, flexibility, and printable area for [mu]CP, while maintaining high quality outputs. A three-part literature review is presented comprising microcontact printing, traditional printing techniques, and roll-to-roll web handling best practices. The development of a printing machine and continuous etching machine used to explore the application of [mu]CP in a high-speed roll-to-roll paradigm is then detailed. Finally, the results of the experimentation carried out are documented including effects on quality and limitations for high throughputs. It is concluded that roll-to-roll microcontact printing can produce high quality results over large areas at rates up to 400 feet per minute and possibly beyond.
by Adam Stagnaro.
M.Eng.

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Віцюк, Юлія Юріївна. "Забезпечення довговічності підшипників ковзання на основі міді та нікелю для удосконалення поліграфічних машин". Doctoral thesis, 2011. https://ela.kpi.ua/handle/123456789/829.

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Lai, Chien-Jung, and 賴建融. "Development of High Speed Auto Splicing Control System for the Gravure Printing Machine." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/89271620963692547216.

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Анотація:

碩士
國立彰化師範大學
電機工程學系
100
In this thesis, a high speed automatic splicing system for gravure printing machines is proposed. A programmable controller and a human-machine interface are adopted in this system. By applying the proposed system, the gravure printing machine would be able to operate under printing speed 200 m/min with high speed automatic splicing feature. Therefore, the cost of required manpower for machine-operating can then be saved and the probability of mistakes by manual splicing can be reduced as well. As a result, the gravure printing machine with the proposed automatic splicing system can meet the market demand for small amount printing, high quality, wide range of substrate materials and lowest amount of waste on short-run printing. Finally, from the experimental results, the production of the gravure printing machine with the proposed high speed automatic splicing system can be enhanced by about 40% .

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HUANG, YEN-TI, and 黃彥迪. "Research and development of high-speed sintering 3D printing machine with page-wide piezoelectric printhead module." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/gy7g27.

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碩士
國立臺灣科技大學
機械工程系
107
This study is the early research on the development of page-wide piezoelectric printhead module high-speed sintering 3D printing machine. At first, the design and development of the heating process was carried out with a modified single thermal bubble printhead powder bed sintering 3D printing machine. At the same time, the material selection and the properties of the material were analyzed to establish the reaction mechanism and print the finished product. Organize a better printing strategy and apply this experience to machine process development. In addition, the nozzle is assembled into a page-wide module to simplify the printing process becoming single pass to achieve high speed process. Thermoplastic polyurethane, TPU, is widely used in current footwear manufacturing industry. As is a kind of amorphous materials, TPU has no clear melting point, which makes it difficult to define the morphology in the powder bed sintering 3D printing process. In this research, detecting of temperature in different area is used to make products and then calculate the difference between dimensional accuracy and mechanical property as a reference for tuning the process parameters. Finally, printability test of the piezoelectric printhead and ink can be carried out as the basis for material selection and adjustment, and using high speed camera to observe the droplets during printing to determine whether the design of the piezoelectric waveform is appropriate.

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Книги з теми "High-speed printing machinery"

(Firm), Anthony's Research, ed. Anthony's guide to offset presses, high speed copiers. Torrance, Calif. (P.O. Box 6930, Torrance 90504): Anthony's Research, 1985.

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Частини книг з теми "High-speed printing machinery"

Adams Stein, Jesse. "The continuity of craft masculinities: from letterpress to offset-lithography." In Hot Metal. Manchester University Press, 2016. http://dx.doi.org/10.7228/manchester/9781784994341.003.0004.

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This chapter considers the effect that an autonomous technical artefact – the printing press – had on the workers in charge of them, the press-machinists. It establishes how the printing press possesses material and social agency in the continuity and transformation of craft masculinity. This issue is examined in the context of the technological shift from letterpress printing to high-speed offset-lithography, which took place chiefly in the 1970s. While the compositors’ experience of technological change has received some attention in labour history and sociology, the trade of press-machining has been almost entirely ignored. Charting the printing industry’s transition from letterpress to offset-lithography opens a new window of understanding into the relevance and influence of large-scale technical machinery on the shop floor. This is related back to the reinforcement of craft masculinities in declining industrial contexts. This allows us to see how particular practices and identities are sometimes maintained and reinvigorated when a conservative institution is threatened with change.

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Malik, Fasih Munir, Syed Faiz Ali, Burak Bal, and Emin Faruk Kececi. "Determination of Optimum Process Parameter Values in Additive Manufacturing for Impact Resistance." In Additive Manufacturing Technologies From an Optimization Perspective, 221–34. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-9167-2.ch011.

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3D printing as a manufacturing method is gaining more popularity since 3D printing machines are becoming easily accessible. Especially in a prototyping process of a machine, they can be used, and complex parts with high quality surface finish can be manufactured in a timely manner. However, there is a need to study the effects of different manufacturing parameters on the materials properties of the finished parts. Specifically, this chapter explains the effects of six different process parameters on the impact resistance. In particular, print temperature, print speed, infill ratio, infill pattern, layer height, and print orientation parameters were studied, and their effects on impact resistance were measured experimentally. Moreover, the optimum values of the process parameters for impact resistance were found. This chapter provides an important guideline for 3D manufacturing in terms of impact resistance of the printed parts. Furthermore, by using this methodology the effects of different 3D printing process parameters on the other material, properties can be determined.

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Roik, T. A., and O. A. Gavrysh. "DEVELOPMENT OF TECHNOLOGY FOR MANUFACTURING EFFICIENT COMPOSITE BEARING MATERIALS FOR HIGH-SPEED PRINTING MACHINES." In PERSPECTIVE TRAJECTORY OF SCIENTIFIC RESEARCH IN TECHNICAL SCIENCES, 547–65. Izdevnieciba “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-085-8-23.

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Тези доповідей конференцій з теми "High-speed printing machinery"

Reuter, Christoph G. "Boundary Conditions for a Traveling Web Detaching From a Rotating Cylinder." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2195.

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Abstract High speed traveling webs appear in a number of technical applications such as plastic foil or paper production machinery and printing machines. Almost all mechanical models for the dynamic behaviour used so far, assume simple support boundary conditions. In reality, in the case of two-dimensional webs immersed in a viscous fluid, a low pressure zone will be present under the web near the point where the web detaches from the rotating drum. Other effects such as adhesion forces may also contribute. Thus, as can often also be seen already by naked-eye examination, the web does not detach tangentially from the drum. In this paper a mechanical model for small amplitude vibrations of a traveling web with small sag is developed, which takes into account the effect of the above described upstream boundary condition. The web is modeled as a one-dimensional heavy string without bending stiffness. The assumption of quasi-static stretching is made, i.e. infinitely high wave speed is assumed for longitudinal waves.

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Fang, Rui-Ming, Hong Chen, and Hui Zhang. "Governor foot mechanism optimum design on high-speed printing press." In Fourth International Conference on Machine Vision (ICMV 11), edited by Zhu Zeng and Yuting Li. SPIE, 2012. http://dx.doi.org/10.1117/12.920147.

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Kawasaki, Shunsuke, Shinichi Kuramoto, Kazuyoshi Fushinobu, Koichi Kato, Kimiharu Yamazaki, and Kaori Hemmi. "Prediction and Control Technique of the Paper Media Temperature After Fusing in Electrophotographic Process." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6396.

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Abstract The production printer market is expected to increase due to the demand in high speed printing. In electrophotographic (EP) process, the printing speed is restricted by the toner cooling time. During continuous printing, if the printing speed is too high, following paper is printed before the toner on previous paper is solidified, which results in the adhesion of the toner on previous paper to the next paper. Therefore, it is important to reduce the toner cooling time to improve the printing speed. From the viewpoint of printing quality, although toner temperature is important in EP process, paper temperature is not. Therefore, to improve the printing speed without worsening printing quality, this report focuses on suppressing paper temperature rise after fusing, which means a method to predict paper temperature after fusing is required. As one of effective approaches to predict paper temperature after fusing, numerical calculation based on physical model has been deployed. Constructing a physical model, however, has some problems such as complexity and uncertainty in particular parameter such as the thermal resistance. Printers have three dimensional and complex structure. The printing process itself is also a complex sequence to be appropriately modeled. It is also difficult to measure the thermal resistance and other properties due to the high speed motion of papers inside the machine. Therefore, as an alternative approach, machine learning can be used to correlate known inputs to the output temperature without relying on these uncertain parameters. The objective of this research is to propose a new method for predicting and controlling the paper media temperature after fusing in electrophotographic process by machine learning. Sensors are attached to the printer for the research. By using these sensors, temperature when printing is obtained. By using these data, machine learning is carried out to predict paper temperature after fusing. This report constructs a new method to predict paper temperature after fusing. Our study demonstrates machine learning is an effective method for predicting and controlling the paper temperature after fusing.

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Kim, Jin-Ho, Jae-Woo Lee, Soo Hyung Park, Do-Young Byun, Yung-Hwan Byun, and Chang Jin Lee. "The Analysis of High-Speed Printing Machine Using Fluid-Structure Interaction Method." In 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-727.

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Lee, Bong-ju, Sung-hwan Kim, and Chul-goo Kang. "Analysis of a Nonlinear Web-Tension Control System of a High- Speed Gravure Printing Machine." In 2006 SICE-ICASE International Joint Conference. IEEE, 2006. http://dx.doi.org/10.1109/sice.2006.315482.

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Yoon, Deokkyun, and Seung-Hyun Lee. "Precision Gravure Printing of Conductive Ink on Flexible Substrate for Printed Electronics." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87243.

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Анотація:

In attempt to lower the production cost, roll-to-roll printing is gaining attention in electronics industries. Gravure printing, which has been the method of choice in the graphics industry for years thanks to its high resolution and process speed, is utilized to print conductive lines on flexible substrate. The main benefactors of such utilization are touch screen panel, RFID tags, thin film photovoltaics, and printed circuit board industries. The preferred substrate for conductive line printing is polymer. Due to its highly flexible nature, the printed electronics is highly flexible and is expected to create new markets where the rigid silicon and glass based electronics could not. In this work, the effect of gravure cell and trench on printing thin conductive lines as low as 20 μm line width on the polyethylene terephthalate (PET) substrate is presented. Various printing orientations including the machine direction, the cross direction, and the 45° grid mesh are used and the respective orientation’s printability is discussed.

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Ashigaki, K., S. Yoshihama, K. Kato, Y. Yamada, and T. Nakamura. "Research on horizontal, inclined, and vertical conveyance of powder by peristaltic conveyor for developing high-speed printing machine." In 2017 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2017. http://dx.doi.org/10.1109/sii.2017.8279317.

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Venkateswaran, Muthiah, Peter Borgesen, and K. Srihari. "Evaluation of a Conductive Adhesive Based Approach to Lead Free Flip Chip Assembly." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39252.

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Electrically conductive adhesives are emerging as a lead free, flux less, low temperature alternative to soldering in a variety of electronics and optoelectronics applications. Some of the potential benefits are obvious, but so far the adhesives have some limitations as well. The present work offers a critical evaluation of one approach to flip chip assembly, which lends itself particularly well to use with a high speed placement machine. Wafers were bumped by stencil printing of a thermoset conductive adhesive, which was then fully cured. In assembly, the conductive adhesive paste was stencil printed onto the pads of a printed circuit board and cured after die placement. The printing process was optimized to ensure robust assembly and the resulting reliability assessed.

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Kwok, Tsz-Ho. "The Quality of Slicing Technologies for Digital Light Processing 3D Printing." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2815.

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Abstract The process planning of a manufacturing method is the key to ensure the quality of the fabricated part. In Additive Manufacturing (AM), slicing is a crucial step in process planning to convert a Computer-Aided Design (CAD) model to a machine-specific format. If the slicing results were incorrect, the manufacturing quality would have no way to be assured. Therefore, it is important to understand the performance of different slicing technologies for AM. Digital Light Processing (DLP) printing is an important AM process that has a good surface finish, high accuracy and fabrication speed, and is widely applied in many dental and engineering industries. However, while most other AM processes are toolpath-based, as a process that uses images as the fabrication tool, the DLP printing has its process planning understudied. Therefore, the main goal of this paper is to study, compare and benchmark the slicing technologies for DLP printing. Three slicing technologies are compared: contour, voxelization, and ray-tracing. They are tested with some common defects in slicing, and their usage in computational resources is also reported. The summary and suggestion are given at the end.

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Zheng, Yi, and Beiwen Li. "Uniaxial High-Speed Micro-Scale 3D Surface Topographical Measurements Using Fringe Projection." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8303.

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Abstract In-situ inspection has drawn many attentions in manufacturing due to the importance of quality assurance. With the rapid growth of additive manufacturing technology, the importance of in-line/in-situ inspections has been raised to a higher level due to many uncertainties that could occur during an additive printing process. Given this, having accurate and robust in-situ monitoring can assist corrective actions for a closed-loop control of a manufacturing process. Contact 3D profilometers such as stylus profilometers or coordinate measuring machines can achieve very high accuracies. However, due to the requirement for physical contact, such methods have limited measurement speeds and may cause damage to the tested surface. Thus, contact methods are not quite suitable for real-time in-situ metrology. Non-contact methods include both passive and active methods. Passive methods (e.g., focus variation or stereo vision) hinges on image-based depth analysis, yet the accuracies of passive methods may be impacted by light conditions of the environment and the texture quality of the surface. Active 3D scanning methods such as laser scanning or structured light are suitable for instant quality inspection due to their ability to conduct a quick non-contact 3D scan of the entire surface of a workpiece. Specifically, the fringe projection technique, as a variation of the structured light technique, has demonstrated significant potential for real-time in-situ monitoring and inspection given its merits of conducting simultaneous high-speed (from 30 Hz real-time to kilohertz high speeds) and high accuracy (tens of μm) measurements. However, high-speed 3D scanning methods like fringe projection technique are typically based on triangulation principle, meaning that the depth information is retrieved by analyzing the triangulation relationship between the light emitter (i.e., projector), the image receiver (i.e., camera) and the tested sample surface. Such measurement scheme cannot reconstruct 3D surfaces where large geometrical variations are present, such as a deep-hole or a stair geometry. This is because large geometrical variations will block the auxiliary light used in the triangulation based methods, which will resultantly cause a shadowed area to occur. In this paper, we propose a uniaxial fringe projection technique to address such limitation. We measured a stair model using both conventional triangulation based fringe projection technique and the proposed method for comparison. Our experiment demonstrates that the proposed uniaxial fringe projection technique can perform high-speed 3D scanning without shadows appearing in the scene. Quantitative testing shows that an accuracy of 35 μm can be obtained by measuring a step-height object using the proposed uniaxial fringe projection system.

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