1606 Wide-range 3D measurement of Single bubble oscillating motion in surfactant solution(2)

2006 ◽  
Vol 2006 (0) ◽  
pp. _1606-1_-_1606-4_
Author(s):  
Yoshiyuki Tagawa ◽  
Shu Takagi ◽  
Yoichiro Matsumoto
Keyword(s):  
Surfactant Solution ◽  
Single Bubble ◽  
3D Measurement ◽  
Wide Range ◽  
Oscillating Motion

Counterfeit Parts Recognition and Detection for Failure Analysts

2010 ◽  
Author(s):  
Katherine V. Whittington
Keyword(s):  
Thermal Cycle ◽  
Visual Inspection ◽  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
3D Measurement ◽  
X Ray ◽  
Wide Range ◽  
Electronic Parts ◽  
Testing Awareness

Abstract The electronics supply chain is being increasingly infiltrated by non-authentic, counterfeit electronic parts, whose use poses a great risk to the integrity and quality of critical hardware. There is a wide range of counterfeit parts such as leads and body molds. The failure analyst has many tools that can be used to investigate counterfeit parts. The key is to follow an investigative path that makes sense for each scenario. External visual inspection is called for whenever the source of supply is questionable. Other methods include use of solvents, 3D measurement, X-ray fluorescence, C-mode scanning acoustic microscopy, thermal cycle testing, burn-in technique, and electrical testing. Awareness, vigilance, and effective investigations are the best defense against the threat of counterfeit parts.

Cylindrical Pin Embossment on A5083 Aluminum Alloy Substrate Fabricated by Friction Stir Forming

2017 ◽  
Vol 730 ◽  
pp. 253-258 ◽  
Author(s):  
Takahiro Ohashi ◽  
Hamed Mofidi Tabatabaei ◽  
Tadashi Nishihara
Keyword(s):  
Aluminum Alloy ◽  
Substrate Material ◽  
Back Surface ◽  
3D Measurement ◽  
Friction Stir ◽  
Single Pass ◽  
Tool Shoulder ◽  
Shoulder Diameter ◽  
Wide Range ◽  
3D Measurement System

This paper reports friction-stir forming (FSF) of cylindrical pin embossments on JIS A5083 aluminum alloy medium gauge plate. A substrate material was put on an emboss die and conducted friction stirring on its back surface. The die has 1mm diameter and 0.5mm deep fine holes at 1.5mm pitch on its top, and the material successfully filled them due to high pressure and heat caused by friction stirring. Three tools having different shoulder diameter were utilized to investigate the deformable area with a single pass. As a consequence, faster spindle speed, slower tool feed rate, and larger tool shoulder contribute to a wider range of completely formed pins. Extrusion of the material to the die cavity seemed to be mostly limited under the area of the shoulder. The ratios of the band width of the complete pins to the shoulder diameter were increased with the larger diameter of the shoulder of the FSF tool. Therefore, a larger shoulder was more effective for wide-range embossing with a single pass. In addition, we evaluated the shape of formed pins with a non-contact 3D measurement system. Accuracy of the height of the completely formed pins was within ±0.013mm, which was comparable with machining.

3D Measurement Using a Fish-Eye Camera Based on EPI Analysis

2012 ◽  
Vol 24 (4) ◽  
pp. 677-685
Author(s):  
Kenji Terabayashi ◽  
◽  
Toru Morita ◽  
Hiroya Okamoto ◽  
Kazunori Umeda ◽  
...  
Keyword(s):  
Mobile Robots ◽  
Three Dimensional ◽  
3D Measurement ◽  
Feature Points ◽  
3D Environment ◽  
Wide Range ◽  
Plane Image ◽  
3D Environments ◽  
Car Driving ◽  
Fish Eye

In car driving support systems and mobile robots, it is important to understand three-dimensional environment widely at once. In this paper, we use a fish-eye camera as a sensor to measure three-dimensional (3D) environments. This camera can take a wide-range and distortional image and can be easily mounted on cars. We propose a method for reconstructing 3D environment using fish-eye images based on Epipolar-Plane Image (EPI) analysis. This method enables easy and stable matching of feature points. The effectiveness of the proposed method is verified by experiments.

Structured light with coded aperture for wide range 3D measurement

2012 ◽  
Author(s):  
Hiroshi Kawasaki ◽  
Yuuki Horita ◽  
Hiroki Morinaga ◽  
Yuuki Matugano ◽  
Satoshi Ono ◽  
...  
Keyword(s):  
Structured Light ◽  
Coded Aperture ◽  
3D Measurement ◽  
Wide Range

Influence of Coating Spray on Surface Measurement Using 3D Optical Scanning Systems

2019 ◽  
Author(s):  
Yuhang Yang ◽  
Siyuan Chen ◽  
Letao Wang ◽  
Jingying He ◽  
Shang-Ming Wang ◽  
...  
Keyword(s):  
Structured Light ◽  
Spray Coating ◽  
Surface Measurement ◽  
Scanning System ◽  
3D Measurement ◽  
Optical Scanning ◽  
Wide Range ◽  
Structured Light Scanning ◽  
3D Measurement System ◽  
Scanning Systems

Abstract High-resolution 3D measurement is crucial for a wide range of applications in manufacturing. With the recent development of optical technologies, the performance of many 3D scanning systems has entered the practical range for object digitizing, reverse engineering, quality control, and many other manufacturing applications. In order to extend the measurement capability to reflective or transparent surfaces, a common practice for reducing the unwanted reflection and refraction is to coat the surfaces with micro-particle spray. There is, however, limited discussion about the influence of coating spray on the resulted measurement precision of 3D optical scanning systems, and due to lack of standardized procedure for spray coating, the variability caused by different operators in surface measurement remains to be examined. This paper investigates the 3D data acquisition of spray-coated surfaces with a structured-light scanning system through experiments and statistical analysis. Both surface roughness and spatial statistics are used to quantitatively evaluate the characteristics of the 3D measurement system. Gauge R&R study is conducted to determine measurement repeatability and reproducibility. The results demonstrate that both the number of spray pass and the skill of the individual operator can significantly affect the performance of the structured-light scanning system. Other pertinent suggestions for the operation of 3D optical scanning systems with spray coating are also provided.

Measurement of Three-Dimensional Environment with a Fish-Eye Camera Based on Structure from Motion - Error Analysis

2009 ◽  
Vol 21 (6) ◽  
pp. 680-688 ◽  
Author(s):  
Kenji Terabayashi ◽  
◽  
Hisanori Mitsumoto ◽  
Toru Morita ◽  
Yohei Aragaki ◽  
...  
Keyword(s):  
Structure From Motion ◽  
Measurement Accuracy ◽  
Three Dimensional ◽  
Simultaneous Estimation ◽  
3D Measurement ◽  
Motion Error ◽  
3 Dimensional ◽  
Wide Range ◽  
Large Distortion ◽  
Fish Eye

This paper proposes a method for measuring 3-dimensional (3D) environment and estimating camera movement with two fish-eye images. This method deals with large distortion of images from a fish-eye camera to calibrate internal and external camera parameters precisely by simultaneous estimation. In this paper, we analyze 3D measurement accuracy based on a theoretical model and evaluate it in practical analysis in experimental and real environments. These analyses show that the theoretical measurement error model works over a wide range of fish-eye views.

Report 27: Some Rigs for Investigating the Properties of Self-Lubricated Bearing Materials with Reciprocating and Oscillating Motion

1967 ◽  
Vol 182 (7) ◽  
pp. 132-134
Author(s):  
P. F. Sheppard ◽  
W. J. J. Crump
Keyword(s):  
Field Experience ◽  
Special Test ◽  
Continuous Rotation ◽  
Wide Range ◽  
Wear And Friction ◽  
Bearing Materials ◽  
Oscillating Motion

Self-lubricated bearing materials find many of their applications in bearings with peculiar motions which will not support a hydrodynamic film. With motions other than continuous rotation or continuous sliding very little information is available. To provide these data for the designer and to investigate the suitability of these materials for specific duties several special test rigs have been developed. This report describes some of the rigs developed for this work and the relevance of the results to field experience. The rigs are capable of subjecting the test bearings to a wide range of speeds and load with reciprocating, oscillating and semi-rotary motions in atmospheres of controlled humidity. Results are usually based on attained life, but both wear and friction are measured.

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