scholarly journals Characterization of ceramics based on laser speckle photometry

2020 ◽  
Vol 9 (2) ◽  
pp. 345-354
Author(s):  
Lili Chen ◽  
Ulana Cikalova ◽  
Beatrice Bendjus ◽  
Stefan Muench ◽  
Mike Roellig
Keyword(s):  
Defect Detection ◽  
Industrial Applications ◽  
Laser Speckle ◽  
Stress Monitoring ◽  
Time Resolved ◽  
Safety Control ◽  
Ceramic Components ◽  
Speckle Patterns ◽  
Surface Defect Detection

Abstract. Advanced ceramic components are frequently used in industrial applications. As a brittle material, ceramic reacts very suddenly to excessively high stresses. Existing defects lead to rapid crack growth followed by spontaneous destruction. This leads to a functional failure of the entire component. It is therefore important to develop innovative techniques to ensure a good quality condition of ceramic products. Laser speckle photometry (LSP) is an optical nondestructive testing method. It is based on the dynamic analysis of time-resolved speckle patterns that are generated by an external excitation. In this paper, we will present two investigations on ceramic components using the LSP technique. One is the nondestructive stress characterization on ceramic surfaces, and the other is the defect detection on ceramics components. The aim is to improve the quality and safety control of ceramic production in the challenging industrial field. Preliminary results have shown the potential of the LSP sensor system for the nondestructive characterization of ceramics in terms of stress monitoring and surface defect detection.

scholarly journals Optical Characterization of Homogeneous and Heterogeneous Intralipid-Based Samples

2020 ◽  
Vol 10 (18) ◽  
pp. 6234
Author(s):  
Ines Delfino ◽  
Maria Lepore ◽  
Rosario Esposito
Keyword(s):  
Optical Properties ◽  
Light Scattering ◽  
Scattered Light ◽  
Industrial Applications ◽  
Point Of View ◽  
Turbid Media ◽  
Time Resolved ◽  
Propagation Of Light ◽  
First Time

Different scattering processes take place when photons propagate inside turbid media. Many powerful experimental techniques exploiting these processes have been developed and applied over the years in a large variety of situations from fundamental and applied research to industrial applications. In the present paper, we intend to take advantage of Static Light Scattering (SLS), Dynamic Light Scattering (DLS), and Time-Resolved Transmittance (TRT) for investigating all the different scattering regimes by using scattering suspensions in a very large range of scatterer concentrations. The suspensions were prepared using Intralipid 20%, a material largely employed in studies of the optical properties of turbid media, with concentrations from 10−5% to 50%. By the analysis of the angular and temporal dependence of the scattered light, a more reliable description of the scattering process occurring in these samples can be obtained. TRT measurements allowed us to obtain information on the reduced scattering coefficient, an important parameter largely used in the description of the optical properties of turbid media. TRT was also employed for the detection of inclusions embedded in Intralipid suspensions, by using a properly designed data analysis. The present study allowed us to better elucidate the dependence of scattering properties of Intralipid suspensions in a very large concentration range and the occurrence of the different scattering processes involved in the propagation of light in turbid media for the first time to our knowledge. In so doing, the complementary contribution of SLS, DLS, and TRT in the characterization of turbid media from an optical and structural point of view is strongly evidenced.

Characterization of the polymerization of composites using laser speckle patterns

2017 ◽  
pp. S45-45
Author(s):  
M Salas ◽  
AM Pozo ◽  
MM Perez ◽  
R Pulgar ◽  
C Lucena
Keyword(s):  
Laser Speckle ◽  
Speckle Patterns

scholarly journals EMPIRICAL CHARACTERIZATION OF WOOD SURFACES BY MEANS OF ITERATIVE AUTOCORRELATION OF LASER SPECKLE PATTERNS.

2008 ◽  
Vol 80 ◽  
pp. 295-306 ◽  
Author(s):  
Juan Antonio Martinez Rojas ◽  
Jesus Alpuente ◽  
Estefania Bolivar ◽  
Pablo López-Espí ◽  
Santiago Vignote ◽  
...  
Keyword(s):  
Laser Speckle ◽  
Speckle Patterns ◽  
Wood Surfaces

Multi-scale characterization of laser speckle patterns

2007 ◽  
Vol 39 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Marie-Cécile Péron ◽  
Steve Guyot ◽  
Eric Deléchelle
Keyword(s):  
Laser Speckle ◽  
Multi Scale ◽  
Speckle Patterns ◽  
Scale Characterization

Synthesis, Characterization, and Dynamic Behavior of Well-defined Dithiomaleimide-functionalized Maltodextrins

2020 ◽  
Vol 17 (2) ◽  
pp. 85-89
Author(s):  
Francisco J. Hidalgo ◽  
Nathan A.P. Lorentz ◽  
TinTin B. Luu ◽  
Jonathan D. Tran ◽  
Praveen D. Wickremasinghe ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Dynamic Behavior ◽  
Industrial Applications ◽  
19F Nmr ◽  
Nmr Studies ◽  
Synthetic Pathway ◽  
End Groups ◽  
Sugar End

: Maltodextrins have an increasing number of biomedical and industrial applications due to their attractive physicochemical properties such as biodegradability and biocompatibility. Herein, we describe the development of a synthetic pathway and characterization of thiol-responsive maltodextrin conjugates with dithiomaleimide linkages. 19F NMR studies were also conducted to demonstrate the exchange dynamics of the dithiomaleimide-functionalized sugar end groups.

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