Noncontact photopyroelectric (PPE) method for the thermo-optical characterisation of layered samples

1997 ◽  
Vol 29 (5) ◽  
pp. 549-554 ◽  
Author(s):  
Jean-Stéphane Antoniow ◽  
Jean-François Henry ◽  
Michel Egée ◽  
Mihai Chirtoc
Keyword(s):  
Ppe Method ◽  
Layered Samples

scholarly journals Numerical Simulation on Spatial-Frequency Domain Imaging for Estimating Optical Absorption and Scattering Properties of Two-Layered Horticultural Products

2021 ◽  
Vol 11 (2) ◽  
pp. 617
Author(s):  
Dong Hu ◽  
Yuping Huang ◽  
Qiang Zhang ◽  
Lijian Yao ◽  
Zidong Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Property ◽  
Optical Absorption ◽  
Spatial Frequency ◽  
Estimation Accuracy ◽  
Property Estimation ◽  
Spatial Frequencies ◽  
Stepwise Method ◽  
Horticultural Products ◽  
Layered Samples

Spatial-frequency domain imaging (SFDI) is a wide-field, noncontact, and label-free imaging modality that is currently being explored as a new means for estimating optical absorption and scattering properties of two-layered turbid materials. The accuracy of SFDI for optical property estimation, however, depends on light transfer model and inverse algorithm. This study was therefore aimed at providing theoretical analyses of the diffusion model and inverse algorithm through numerical simulation, so as to evaluate the potential for estimating optical absorption and reduced scattering coefficients of two-layered horticultural products. The effect of varying optical properties on reflectance prediction was first simulated, which indicated that there is good separation in diffuse reflectance over a large range of spatial frequencies for different reduced scattering values in the top layer, whereas there is less separation in diffuse reflectance for different values of absorption in the top layer, and even less separation for optical properties in the bottom layer. To implement the nonlinear least-square method for extracting the optical properties of two-layered samples from Monte Carlo-generated reflectance, five curve fitting strategies with different constrained parameters were conducted and compared. The results confirmed that estimation accuracy improved as fewer variables were to be estimated each time. A stepwise method was thus suggested for estimating optical properties of two-layered samples. Four factors influencing optical property estimation of the top layer, which is the basis for accurately implementing the stepwise method, were investigated by generating absolute error contour maps. Finally, the relationship between light penetration depth and spatial frequency was studied. The results showed that penetration depth decreased with the increased spatial frequency and also optical properties, suggesting that appropriate selection of spatial frequencies for a stepwise method to estimate optical properties from two-layered samples provides potential for estimation accuracy improvement. This work lays a foundation for improving optical property estimation of two-layered horticultural products using SFDI.

Monte Carlo Method for Quantitative Analysis of Bulk and Layered Samples

1996 ◽  
pp. 307-316
Author(s):  
Ondrej Gedeon ◽  
Václav Hulínský ◽  
Karel Jurek ◽  
Marta Šimečková
Keyword(s):  
Monte Carlo ◽  
Quantitative Analysis ◽  
Monte Carlo Method ◽  
Layered Samples

Magneto-impedance Effects in Electrodeposited Multi-layer [NiFe/Cu]3 on Cu Wire Substrates for kHz-order Frequency Measurements

2021 ◽  
Vol 1 (1) ◽  
pp. 9-12
Author(s):  
Blasius Anggit Wicaksono ◽  
Nuryani Nuryani ◽  
Budi Purnama
Keyword(s):  
Saturation Magnetization ◽  
Layer Thickness ◽  
Platinum Electrode ◽  
Layered System ◽  
Frequency Measurements ◽  
Spacer Layer ◽  
Layered Samples

The magneto-impedance effect (MI) in an electrodeposited multi-layered system of [NiFe/Cu]N on a Cu wire was modified by varying the thickness of the Cu spacer layer. The multi-layered samples of [NiFe/Cu]N were deposited by the electrodeposition using a platinum electrode. The MI ratio rapidly increased with a frequency of up to 100 kHz where it saturated. Conversely, the MI ratio of the multi-layered system [NiFe (800 nm)/Cu(y nm)]3 was a decreasing function of Cu layer thickness. The decreased MI ratio may be attributed to the lowered saturation magnetization in the multi-layered system with thicker spacer layers.

Substrate interaction in ranged photoacoustic spectroscopy of layered samples

2014 ◽  
Vol 136 (4) ◽  
pp. 2256-2256
Author(s):  
Logan S. Marcus ◽  
Ellen L. Holthoff ◽  
Paul M. Pellegrino
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Substrate Interaction ◽  
Layered Samples

Electron beam excitation in thin layered samples

2007 ◽  
Vol 159 (1-3) ◽  
pp. 46-52 ◽  
Author(s):  
H.-J. Fitting ◽  
N. Cornet ◽  
Roushdey Salh ◽  
C. Guerret-Piécourt ◽  
D. Goeuriot ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Excitation ◽  
Beam Excitation ◽  
Layered Samples

Observation of Selényi rings in the diffraction patterns of layered samples with periodic arrays of cylindrical structures

2020 ◽  
Vol 37 (6) ◽  
pp. 940
Author(s):  
Anna Shlyagina ◽  
Alma K. González-Alcalde ◽  
Rafael Salas-Montiel ◽  
Eugenio R. Méndez
Keyword(s):  
Cylindrical Structures ◽  
Periodic Arrays ◽  
Diffraction Patterns ◽  
Layered Samples
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