3-D Surface Profilometry by Direct Color-Fringe Identification and an Orthogonal Setup

2018 ◽  
Author(s):  
Nadia Tornero-Martínez ◽  
Gerardo Trujillo-Schiaffino ◽  
Didia Patricia Salas-Peimbert ◽  
Marcelino Anguiano-Morales ◽  
Luis Francisco Corral-Martínez ◽  
...  
Keyword(s):  
Surface Profilometry ◽  
Color Fringe ◽  
Direct Color

scholarly journals Novel Boundary Edge Detection for Accurate 3D Surface Profilometry Using Digital Image Correlation

2018 ◽  
Vol 8 (12) ◽  
pp. 2541 ◽  
Author(s):  
Liang-Chia Chen ◽  
Ching-Wen Liang
Keyword(s):  
Digital Image Correlation ◽  
Edge Detection ◽  
Digital Image ◽  
Optical Diffraction ◽  
Image Correlation ◽  
Detection Accuracy ◽  
Boundary Edge ◽  
Discontinuous Surface ◽  
Full Field ◽  
Surface Profilometry

Digital image correlation (DIC) has emerged as a popular full-field surface profiling technique for analyzing both in-plane and out-of-plane dynamic structures. However, conventional DIC-based surface 3D profilometry often yields erroneous contours along surface edges. Boundary edge detection remains one of the key issues in DIC because a discontinuous surface edge cannot be detected due to optical diffraction and height ambiguity. To resolve the ambiguity of edge measurement in optical surface profilometry, this study develops a novel edge detection approach that incorporates a new algorithm using both the boundary subset and corner subset for accurate edge reconstruction. A pre-calibrated gauge block and a circle target were reconstructed to prove the feasibility of the proposed approach. Experiments on industrial objects with various surface reflective characteristics were also conducted. The results showed that the developed method achieved a 15-fold improvement in detection accuracy, with measurement error controlled within 1%.

Surface Profilometry

2009 ◽  
Author(s):  
Toru Yoshizawa ◽  
Toshitaka Wakayama
Keyword(s):  
Surface Profilometry

Single Color Fringe Projection for Measuring Three-Dimensional Shapes with Discontinuities

2012 ◽  
Vol 32 (4) ◽  
pp. 0412005
Author(s):  
戴美玲 Dai Meiling ◽  
杨福俊 Yang Fujun ◽  
耿敏 Geng Min ◽  
何小元 He Xiaoyuan ◽  
康新 Kang Xin
Keyword(s):  
Three Dimensional ◽  
Fringe Projection ◽  
Color Fringe

Flame Patterns and Combustion Intensity Behind Rifled Bluff-Body Frustums

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Kuo C. San ◽  
Yu Z. Huang ◽  
Shun C. Yen
Keyword(s):  
Bluff Body ◽  
Flow Behavior ◽  
Turbulent Flame ◽  
Flame Temperature ◽  
Flame Length ◽  
Turbulent Flames ◽  
Temperature Profiles ◽  
Lifted Flames ◽  
Direct Color ◽  
Jet Nozzle

Rifled fillisters were milled on cannular frustums to modulate flow behavior and to increase the turbulence intensity (TI). The TI and combustion intensity were compared in four configurations of frustums—unrifled, inner-rifled, outer-rifled, and two-faced rifled. The flame patterns and flame lengths were observed and measured by direct-color photography. The temperature profiles and (total) combustion intensity were detected and calculated with an R-type thermocouple. Three flame patterns (jet, flickering, and lifted flames) were defined behind the pure-jet nozzle. Four flame patterns (jet, flickering, bubble, and turbulent flames) were observed behind the unrifled frustum. The bluff-body frustum changes the lifted flame to turbulent flame due to a high T.I at high central-fuel velocity (uc). The experimental data showed that the grooved rifles improved the air-propane mixing, which then improved the combustion intensity. The rifled mechanism intensified the swirling effect and then the flame-temperature profiles were more uniform than those behind the pure-jet nozzle. The increased TI also resulted in the shortest flame length behind the two-faced rifled frustum and increased the total combustion intensity.

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