Production-integrated quality-control using optical measurement techniques

2015 ◽  
Author(s):  
Nils Helmut Feige ◽  
Siegfried Heinz ◽  
Achim Ebert ◽  
Hans Hagen ◽  
Peter Dannenmann
Keyword(s):  
Quality Control ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Optical Measurements ◽  
Seamless Integration ◽  
Business Units ◽  
Inspection Process ◽  
History Of ◽  
On Line ◽  
And Storage

In today’s manufacturing processes, optical measurement techniques are becoming increasingly popular for on-line quality control. This fast and cheap technique enables manufacturers to not only check single points given by an inspection plan, but entire surfaces. This paradigm change brings new possibilities as well as new challenges to the inspection process. We devised software and technologies that achieve a seamless integration of optical measurement techniques into the existing workflow in the production process from design and prototyping up to series production. These techniques go far beyond the simple measuring of structural dimensions. The system permits the management and storage of the complete history of measurements. Hence, trends in deviations from the desired quality or functionality can be determined early and easily. This helps to implement corrective actions even before the produced structures fail to meet the specifications. Using a safe and decentralized server architecture using https, all data is available across business units and plants. Additionally, we developed highly interactive visualization and data exploration tools which enable expert users to fast and easily evaluate the measured data. With these techniques and visualization tools, we combine the advantages of optical measurements with the established evaluation of tactile measurements.

scholarly journals Comparison of luminance distribution on the lighting surface of power LEDs

2019 ◽  
Vol 11 (4) ◽  
pp. 118
Author(s):  
Dariusz Czyżewski
Keyword(s):  
Imaging System ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Optical Measurements ◽  
Automated System ◽  
Junction Temperature ◽  
Observation Angle ◽  
Luminance Distribution ◽  
Led Array ◽  
Visegrád Countries

This work presents luminance distributions across the surface of mid- and high-power diodes. The changes in luminance on diode surfaces following changes in the observation angle were verified. On the basis of the conducted tests, non-uniform luminance distribution on LED surface for diverse observation angles (including the axial direction) was observed. Moreover, it was concluded that luminance changes is not in line with the Lambert’s law. As the result of the research it was also concluded that alterations of the power-supply conditions do not exert any significant impact on the gradient of luminance changes on the surfaces of examined LEDs. Full Text: PDF ReferencesJ. Fan, J. Cao, Ch. Yu, Ch. Qian, X. Fan, G. Zhang, A design and qualification of LED flip Chip-on-Board module with tunable color temperatures, Microelectronics reliability, ISSN 0026-2714, Nº. 84, 2018, pp. 140-148, CrossRef K. Bonislawski, I. Fryc, The study on optical properties of LEDs used for vehicle control lighting, Przeglad Elektrotechniczny, 2012, ISSN 0033-2097, Vol. 88, Issue 3A, pp. 119-120 DirectLink T. Kawabata, Y. Ohno, Optical measurements of OLED panels for lighting applications, Journal of Modern Optics 60(14), 2013, pp. 1176-1186 CrossRef P. Pracki, U. Blaszczak, The issues of interior lighting on the example of an educational building adjustment to nZEB standard, IEEE Lighting Conference of the Visegrad Countries (Lumen V4), IEEE (17 November 2016) CrossRef P. Tabaka, Analysis of electrical parameters of prime set bulb equivalents suitable for dimming, Przeglad Elektrotechniczny, 2015, R. 91, No. 5, pp. 100-106, ISSN 0033-2097 CrossRef D. Czyżewski, The street lighting luminaires with LEDs. Przeglad Elektrotechniczny, 86, 2009, pp. 276-279 DirectLink C. C. Miller; Y. Zong; Y. Ohno, LED photometric calibrations at the National Institute of Standards and Technology and future measurement needs of LEDs, Proc. SPIE Vol. 5530, Fourth International Conference on Solid State Lighting; (2004) CrossRef D. Mozyrska Dorota; M. Wyrwas; I. Fryc, The determination of the LEDs colorimetric parameters, in the range of their operating temperature, Przeglad Elektrotechniczny, Vol. 88, Issue: 4A, 2012, pp. 232-234 CrossRef K. Baran, A. Różowicz, H. Wachta, S. Różowicz, D. Mazur, Thermal Analysis of the Factors Influencing Junction Temperature of LED Panel Sources, Energies, 12, 3941, 2019 CrossRef D. Czyżewski, Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes, Crystals 9(12), 645, 2019. CrossRef L. Zheng, Z. Guo, W. Yan, Y. Lin, Y. Lu, H.C. Kuo, Z. Chen, L. Zhu, T. Wu, Y. Gao, Research on a Camera-Based Microscopic Imaging System to Inspect the Surface Luminance of the Micro-LED Array. IEEE Access 6, 2018, 51329-51336. CrossRef S. Słomiński, Selected Problems in Modern Methods of Luminance Measurement of Multisource LED Luminaires. Light Eng. 24, 2016, pp. 45-50. DirectLink I. Fryc, P. Jakubowski, K. Kołacz, Analysis of optical radiation parameters of compact discharge HID lamps and LED COB modules used for illuminating shop windows, Przeglad Elektrotechniczny, 2017, R. 93, nr 11, pp. 186-189. CrossRef I. Fryc, Measurement techniques of optical LEDs properties performed with compliance conformity with CIE 127:2007 standard, Przeglad Elektrotechniczny, 2009,ISSN 0033-2097,Vol. 85,Issue:11,pp.317-319. DirectLink I. Fryc, T. Dimitrova-Grekow, An Automated System for Evaluation of the Quality of Light Sources, 2016 IEEE Lighting Conference of the Visegrad Countries (Lumen V4), IEEE (17 November 2016), CrossRef CIE 235:2019, Optical measurement of led modules and light engines, ISBN 978-3-902842-25-1, DOI: 10.25039/TR.235.2019. CrossRef D. Czyżewski, Investigation of COB LED luminance distribution, In Proceedings of the 2016 IEEE Lighting Conference of the Visegrad Countries (Lumen V4), IEEE (17 November 2016) CrossRef I. Rotscholl, K. Trampert; U. Krüger; F. Schmidt, Spectral near field data of LED systems for optical simulations, Proceedings SPIE Volume 11144,Phot. and Educ. in Measur. Sc. 2019, CrossRef

A Study on the Spray Characteristics of a Liquid-Propellant Thruster Injector by PIV/PDA Optical Measurements

2007 ◽  
Author(s):  
Jeong Soo Kim ◽  
Jin Seok Kim ◽  
Hun Jung ◽  
Jeong Park ◽  
Sungcho Kim ◽  
...  
Keyword(s):  
Optical Measurement ◽  
Measurement Techniques ◽  
Optical Measurements ◽  
Clear Understanding ◽  
Liquid Propellant ◽  
Spray Characteristics ◽  
Thrust Chamber ◽  
Piv Measurement ◽  
Dimensional Parameters ◽  
Center Axis

Spray characteristics of an injector employed in liquid-propellant thrusters are investigated by optical measurement techniques such as Particle Image Velocimetry (PIV) and Dual-mode Phase Doppler Anemometry (DPDA). The injector adopted in this experiment has 8 holes each of which has 30° cant angle from the center-axis with 16/1000 inches of hole diameter. Instantaneous plane images captured by PIV technique are examined in order to judge a pass-fail criterion of spray injection performance according to the specific pressures supplied. DPDA through which two-dimensional velocity components can be acquired is also applied in order to measure the velocity and size of spray droplets which were not obtainable from the PIV measurement. The non-dimensional parameters (e.g., Reynolds, Weber, and Ohnesorge numbers) based on the velocity data measured by DPDA are used to characterize the spray behavior in terms of the atomization and turbulence nature. Objectives of this experiment are to establish a non-intrusive evaluation technique for the injector performance and to utilize the clear understanding of spray characteristics for the design of brand-new thrust chamber as well.

History of land classification relating to waterpower and storage sites

Circular ◽  
1957 ◽  
Author(s):  
Fred Forrest Lawrence ◽  
C.E. Nordeen ◽  
H.L. Pumphrey
Keyword(s):  
Land Classification ◽  
History Of ◽  
And Storage

The FATE Landscape of Sign Language AI Datasets

2021 ◽  
Vol 14 (2) ◽  
pp. 1-45
Author(s):  
Danielle Bragg ◽  
Naomi Caselli ◽  
Julie A. Hochgesang ◽  
Matt Huenerfauth ◽  
Leah Katz-Hernandez ◽  
...  
Keyword(s):  
Sign Language ◽  
New Technology ◽  
Individual Data ◽  
Community Members ◽  
Sign Languages ◽  
Language Data ◽  
History Of ◽  
Language Technologies ◽  
And Storage ◽  
Access Mechanisms

Sign language datasets are essential to developing many sign language technologies. In particular, datasets are required for training artificial intelligence (AI) and machine learning (ML) systems. Though the idea of using AI/ML for sign languages is not new, technology has now advanced to a point where developing such sign language technologies is becoming increasingly tractable. This critical juncture provides an opportunity to be thoughtful about an array of Fairness, Accountability, Transparency, and Ethics (FATE) considerations. Sign language datasets typically contain recordings of people signing, which is highly personal. The rights and responsibilities of the parties involved in data collection and storage are also complex and involve individual data contributors, data collectors or owners, and data users who may interact through a variety of exchange and access mechanisms. Deaf community members (and signers, more generally) are also central stakeholders in any end applications of sign language data. The centrality of sign language to deaf culture identity, coupled with a history of oppression, makes usage by technologists particularly sensitive. This piece presents many of these issues that characterize working with sign language AI datasets, based on the authors’ experiences living, working, and studying in this space.

scholarly journals Upconversion Spectral Rulers for Transcutaneous Displacement Measurements

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3554
Author(s):  
Melissa M. Suckey ◽  
Donald W. Benza ◽  
John D. DesJardins ◽  
Jeffrey N. Anker
Keyword(s):  
Optical Measurement ◽  
Optical Measurements ◽  
Small Displacement ◽  
Simple Method ◽  
Low Background ◽  
X Ray ◽  
Optical Displacement ◽  
Spectral Peaks ◽  
Displacement Measurements ◽  
Minimal Intensity

We describe a method to measure micron to millimeter displacement through tissue using an upconversion spectral ruler. Measuring stiffness (displacement under load) in muscles, bones, ligaments, and tendons is important for studying and monitoring healing of injuries. Optical displacement measurements are useful because they are sensitive and noninvasive. Optical measurements through tissue must use spectral rather than imaging approaches because optical scattering in the tissue blurs the image with a point spread function typically around the depth of the tissue. Additionally, the optical measurement should have low background and minimal intensity dependence. Previously, we demonstrated a spectral encoder using either X-ray luminescence or fluorescence, but the X-ray luminescence required an expensive X-ray source and used ionizing radiation, while the fluorescence sensor suffered from interference from autofluorescence. Here, we used upconversion, which can be provided with a simple fiber-coupled spectrometer with essentially autofluorescence-free signals. The upconversion phosphors provide a low background signal, and the use of closely spaced spectral peaks minimizes spectral distortion from the tissue. The small displacement noise level (precision) through tissue was 2 µm when using a microscope-coupled spectrometer to collect light. We also showed proof of principle for measuring strain on a tendon mimic. The approach provides a simple method to study biomechanics using implantable sensors.

scholarly journals Proof-of-PUF Enabled Blockchain: Concurrent Data and Device Security for Internet-of-Energy

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 28
Author(s):  
Rameez Asif ◽  
Kinan Ghanem ◽  
James Irvine
Keyword(s):  
Hybrid Approach ◽  
Future Research ◽  
Data Provenance ◽  
Data Generation ◽  
Cyber Attack ◽  
Design Development ◽  
Seamless Integration ◽  
Device Identification ◽  
Physical Unclonable Functions ◽  
History Of

A detailed review on the technological aspects of Blockchain and Physical Unclonable Functions (PUFs) is presented in this article. It stipulates an emerging concept of Blockchain that integrates hardware security primitives via PUFs to solve bandwidth, integration, scalability, latency, and energy requirements for the Internet-of-Energy (IoE) systems. This hybrid approach, hereinafter termed as PUFChain, provides device and data provenance which records data origins, history of data generation and processing, and clone-proof device identification and authentication, thus possible to track the sources and reasons of any cyber attack. In addition to this, we review the key areas of design, development, and implementation, which will give us the insight on seamless integration with legacy IoE systems, reliability, cyber resilience, and future research challenges.

On-Line Quality Control

1995 ◽  
pp. 37-57 ◽  
Author(s):  
Frank W. Henrikson
Keyword(s):  
Quality Control ◽  
On Line

Development of the On-Line Monitoring System for Fuel Cell Voltage

2011 ◽  
Vol 219-220 ◽  
pp. 383-386
Author(s):  
Jing Li ◽  
Hong Pan ◽  
Shu Juan Zhang ◽  
Ling Fang Sun
Keyword(s):  
Fuel Cell ◽  
Monitoring System ◽  
Software Design ◽  
Output Voltage ◽  
Cell Voltage ◽  
Development Environment ◽  
Fuel Cell Stack ◽  
Actual Application ◽  
On Line ◽  
And Storage

According to the single battery's series structure in the fuel cell stack, we develop an on-line fuel cell voltage monitoring system, and realize VISA library functions’ call and operation data acquisition and storage successfully in the Delphi development environment. It’s introduced mainly that the monitoring principle, hardware structure, software design and the main feature. The actual application proves that this system has realized high-precision and real-time monitoring of the output voltage of the fuel cell for multi-channel, and has multi-condition operation by setting original parameters easily, thereby, the system has more applicability and well reliability.

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