Optical Simulation of Omnidirectional Inspection System for Screw Threads

2014 ◽  
Vol 625 ◽  
pp. 706-711
Author(s):  
Keun Park ◽  
Chang Hun Lee ◽  
Seung Woo Ra
Keyword(s):  
Surface Defects ◽  
Optical Measurement ◽  
Optical Simulation ◽  
Inspection System ◽  
Light Illumination ◽  
Screw Thread ◽  
Simulation Based ◽  
Screw Threads ◽  
Optical Paths

Machine vision systems have been used in the automatic inspection of screw threads using backlight illumination for the inspection of the screw thread profiles. In this study, an alternative inspection system based on front light illumination is developed to directly obtain thread images so that surface defects can be measured. To realize such an inspection system, an omnidirectional optical measurement device is proposed to obtain 360oimages of screws for inspection of whole thread regions. Optical simulation based on ray tracing is then performed to analyze optical paths and to optimize the image quality of the designed optical system.

scholarly journals Examination of a Low-Profile Spinal Implant

2017 ◽  
Vol 11 (6) ◽  
pp. 895-901
Author(s):  
Takuto Iwade ◽  
Noriyuki Hisamori ◽  
Junichi Fujita ◽  
Kenji Yamaya ◽  
◽  
...  
Keyword(s):  
Contact Area ◽  
Cyclic Load ◽  
Load Test ◽  
Screw Thread ◽  
Static Load Test ◽  
Spinal Implant ◽  
Thread Surface ◽  
Low Profile ◽  
Screw Threads

Most spine implant devices are fabricated outside Japan, and therefore do not always fit the bodies of Japanese people. This causes a quality-of-life (QOL) problem in which patients feel the embedded implant devices on their back. The aim of this study was to develop more compact and lower-profile spine implant devices. Three types of devices with different heights and different screw threads were created, and the removal torque (fitting force) of the devices was measured after a static load test and cyclic load test. In addition, the screw thread surface was observed in detail after the tests. The results indicated that the mechanism of the reduction in the fitting force was related to partial contact due to abrasion or plastic deformation of the screw thread surface and decrease in the contact area between the screw threads caused by the increased diameter of the upper opening of the implant device after tightening. Therefore, we concluded that lowering the height of the implant device, securing the number of the screw threads, and securing the contact area of the threads are important in developing a low-profile spine implant.

Some Observations in Grinding Surface Quality of FRCMC

2013 ◽  
Vol 770 ◽  
pp. 198-201 ◽  
Author(s):  
Xiao Yan Cao ◽  
Bin Lin ◽  
Yan Wang ◽  
Shao Lei Wang
Keyword(s):  
Surface Quality ◽  
Fiber Orientation ◽  
Surface Defects ◽  
Optical Measurement ◽  
Orientation Angle ◽  
Decisive Role ◽  
Ceramic Matrix Composites ◽  
Obtuse Angle ◽  
High Tech

FRCMCs have potential applications in aerospace and other high-tech fields. According to FRCMCs anisotropic and non-homogeneous structure, the composites surface characteristics are different from metal material. Fiber orientations play the decisive role in grinding surface quality of woven ceramic matrix composites. This paper investigates the relationship between fiber orientations and grinding surface quality. Using a non-contact optical measurement instrument, the method was developed on 2.5D SiO2/SiO2 composite. Through a series of measuring experiments, it was found that greater grinding surface quality occurred at a fiber orientation 90, but poorer grinding surface took place at a fiber orientation 0. Meanwhile there were less surface defects at acute fiber orientation angle than at obtuse angle. The research obtained will be an important technical support on improving the processing quality of FRCMC.

Automatic Inspection System for Surface Defect of Precision Steel Ball

2014 ◽  
Vol 685 ◽  
pp. 405-409
Author(s):  
Yi Ji Chen ◽  
Jhy Cherng Tsai ◽  
Ya Chen Hsu
Keyword(s):  
Surface Defect ◽  
Surface Defects ◽  
Optical Measurement ◽  
Steel Ball ◽  
Inspection System ◽  
Automatic Inspection ◽  
Robust Method ◽  
Defect Inspection ◽  
Critical Components ◽  
Steel Balls

Precision steel ball is one of the most critical components for rolling transmission. As precision ball affects the performance of precision transmission system, fully inspection of these balls is an urgent need for the industry. This paper is to develop a real-time inspection system for surface defects of precision steel ball with fast and robust method and mechanism. The developed system consists of an optical measurement module as well as a mechanism module for full surface inspecting of the steel ball. The minimum defect and area can be detected by the developed system are 0.1mm and 0.01 mm2 respectively. The developed system has been testified against the designed specifications at speed higher than 3pc/sec and less than 0.5% missing rate. It verified the resolution, accuracy and robustness of the developed system which is capable for final defect inspection of steel balls for grade 100 bearing.

The Research of Nitrile Gloves Visual On-Line Automatic Surface Defect Inspection System

2014 ◽  
Vol 701-702 ◽  
pp. 560-564
Author(s):  
Hui Liu ◽  
You Zhi Ren ◽  
Lu Wang ◽  
Qian Zeng ◽  
Ya Wei Yang ◽  
...  
Keyword(s):  
Production Efficiency ◽  
Surface Defects ◽  
Detection System ◽  
Extraction Methods ◽  
Image Features ◽  
Automatic Line ◽  
Line Detection ◽  
Inspection System ◽  
On Line

This paper describes an automatic line detection system which is based on mechanical vision technology to detect the defects of the nitrile gloves’ surface, and mainly discusses the extraction methods and the recognition algorithms about the gloves image features. Finally, the last part gives the methods to design an easy-operation, friendly-interface, full-functions interface software system. The automatic line detection system about nitrile gloves surface defects not only lets the gloves detection line to be automated, but also improves the production efficiency and the quality of the products.

Characterization of homoepitaxial diamond films by Electron microscopy

1991 ◽  
Vol 49 ◽  
pp. 880-881
Author(s):  
D.P. Malta ◽  
S.A. Willard ◽  
R.A. Rudder ◽  
G.C. Hudson ◽  
J.B. Posthill ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Surface Defects ◽  
Substrate Surface ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Polycrystalline Diamond ◽  
Large Degree ◽  
Rf Plasma ◽  
Semiconducting Diamond

Semiconducting diamond films have the potential for use as a material in which to build active electronic devices capable of operating at high temperatures or in high radiation environments. A major goal of current device-related diamond research is to achieve a high quality epitaxial film on an inexpensive, readily available, non-native substrate. One step in the process of achieving this goal is understanding the nucleation and growth processes of diamond films on diamond substrates. Electron microscopy has already proven invaluable for assessing polycrystalline diamond films grown on nonnative surfaces.The quality of the grown diamond film depends on several factors, one of which is the quality of the diamond substrate. Substrates commercially available today have often been found to have scratched surfaces resulting from the polishing process (Fig. 1a). Electron beam-induced current (EBIC) imaging shows that electrically active sub-surface defects can be present to a large degree (Fig. 1c). Growth of homoepitaxial diamond films by rf plasma-enhanced chemical vapor deposition (PECVD) has been found to planarize the scratched substrate surface (Fig. 1b).

Physico-Chemical Analysis of Groundwater and Effect of Climatic Change in Angul-Talcher Area

2018 ◽  
Vol 6 (12) ◽  
pp. 26
Author(s):  
Aliva Bera ◽  
D.P. Satapathy
Keyword(s):  
Water Resources ◽  
Linear Regression ◽  
Regression Model ◽  
Climatic Change ◽  
Linear Regression Model ◽  
Ann Model ◽  
Quality Of Water ◽  
Physico Chemical ◽  
Simulation Based

In this paper, the linear regression model using ANN and the linear regression model using MS Excel were developed to estimate the physico-chemical concentrations in groundwater using pH, EC, TDS, TH, HCO3 as input parameters and Ca, Mg and K as output parameters. A comparison was made which indicated that ANN model had the better ability to estimate the physic-chemical concentrations in groundwater. An analytical survey along with simulation based tests for finding the climatic change and its effect on agriculture and water bodies in Angul-Talcher area is done. The various seasonal parameters such as pH, BOD, COD, TDS,TSS along with heavy elements like Pb, Cd, Zn, Cu, Fe, Mn concentration in water resources has been analyzed. For past 30 years rainfall data has been analyzed and water quality index values has been studied to find normal and abnormal quality of water resources and matlab based simulation has been done for performance analysis. All results has been analyzed and it is found that the condition is stable. 

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