Improved optical techniques for studying sonic and supersonic injection into Mach 3 flow

1997 ◽  
Author(s):  
Alvin E. Buggele ◽  
Richard G. Seasholtz
Keyword(s):  
Optical Techniques ◽  
Mach 3 ◽  
Supersonic Injection

Comparison between the tilted SmC?* and SmC?* phases of MHPOBC studied by optical techniques

1994 ◽  
Vol 4 (12) ◽  
pp. 2149-2159 ◽  
Author(s):  
John Philip ◽  
Jean-Ren� Lalanne ◽  
Jean-Paul Marcerou ◽  
Gilles Sigaud
Keyword(s):  
Optical Techniques

scholarly journals An Improved Lagrangian-Inverse Method for Evaluating the Dynamic Constitutive Parameters of Concrete

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1871
Author(s):  
Xinlu Yu ◽  
Yingqian Fu ◽  
Xinlong Dong ◽  
Fenghua Zhou ◽  
Jianguo Ning
Keyword(s):  
High Speed ◽  
Inverse Method ◽  
Image Correlation ◽  
Analysis Method ◽  
Stress Strain ◽  
Optical Techniques ◽  
Element Simulation ◽  
Non Linear ◽  
Constitutive Parameters ◽  
Inverse Analysis Method

The dynamic constitutive behaviors of concrete-like materials are of vital importance for structure designing under impact loading conditions. This study proposes a new method to evaluate the constitutive behaviors of ordinary concrete at high strain rates. The proposed method combines the Lagrangian-inverse analysis method with optical techniques (ultra-high-speed camera and digital image correlation techniques). The proposed method is validated against finite-element simulation. Spalling tests were conducted on concretes where optical techniques were employed to obtain the high-frequency spatial and temporal displacement data. We then obtained stress–strain curves of concrete by applying the proposed method on the results of spalling tests. The results show non-linear constitutive behaviors in these stress–strain curves. These non-linear constitutive behaviors can be possibly explained by local heterogeneity of concrete. The proposed method provides an alternative mean to access the dynamic constitutive behaviors which can help future structure designing of concrete-like materials.

scholarly journals Determination of non-linear refractive index of laser crystals and ceramics via different optical techniques

2020 ◽  
Vol 8 ◽  
pp. 100065
Author(s):  
Laurent Lamaignère ◽  
Guido Toci ◽  
Barbara Patrizi ◽  
Matteo Vannini ◽  
Angela Pirri ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Techniques ◽  
Linear Refractive Index ◽  
Non Linear ◽  
Laser Crystals

Novel electro-optical techniques in metrology

1976 ◽  
Vol 22 (1) ◽  
pp. 27 ◽  
Author(s):  
L. Balmer ◽  
A.H. Falkner ◽  
W.N. Taberner
Keyword(s):  
Optical Techniques

New optical techniques to improve the visibility of graphene on multiple substrates

2011 ◽  
Author(s):  
Hugo Gonçalves ◽  
Peter Schellenberg ◽  
Michael Belsley ◽  
Luís Alves ◽  
Cacilda Moura ◽  
...  
Keyword(s):  
Optical Techniques ◽  
Multiple Substrates

Optical techniques for perfusion monitoring of the gastric tube after esophagectomy: a review of technologies and thresholds

2018 ◽  
Vol 31 (6) ◽  
Author(s):  
S M Jansen ◽  
D M de Bruin ◽  
M I van Berge Henegouwen ◽  
S D Strackee ◽  
D P Veelo ◽  
...  
Keyword(s):  
Gastric Tube ◽  
Optical Techniques
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