Development of System for Simultaneous Measurement of Stress and Temperature

2006 ◽  
Vol 326-328 ◽  
pp. 163-166 ◽  
Author(s):  
Eisaku Umezaki ◽  
Masahito Abe
Keyword(s):  
Time Series ◽  
Simultaneous Measurement ◽  
Beam Splitter ◽  
Visible Range ◽  
Ultraviolet Rays ◽  
Infrared Range ◽  
Curing Process ◽  
Beam Splitting ◽  
Ultraviolet Curing ◽  
Phase Stepping

A system was developed for simultaneously measuring stress and temperature in structures in time series. The stress and temperature were measured using the photoelastic technique in the form of phase stepping and the thermographic technique, respectively. Four phase-stepped photoelastic images were captured simultaneously using beam-splitting optics. A beam splitter was used for transmitting light in the visible range while simultaneously reflecting light in the infrared range. The system was applied to ultraviolet curing resin with a step part illuminated with ultraviolet rays, and the stress and temperature in the curing process were measured. Results showed that the stress and temperature in the curing process can be measured simultaneously in time series using the system. The step part of the resin affected the distribution of the stress and temperature

scholarly journals Compact Photonic Crystal Polarization Beam Splitter Based on the Self-Collimation Effect

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 198
Author(s):  
Geyu Tang ◽  
Huamao Huang ◽  
Yuqi Liu ◽  
Hong Wang
Keyword(s):  
Optical Communications ◽  
Beam Splitter ◽  
Extinction Ratio ◽  
Polarized Light ◽  
The Self ◽  
Polarization Beam Splitter ◽  
Optical Interconnection ◽  
Beam Splitting ◽  
Beam Splitters ◽  
Polarization Extinction Ratio

We propose a new compact polarization beam splitter based on the self-collimation effect of two-dimensional photonic crystals and photonic bandgap characteristics. The device is composed of a rectangular air holes-based polarization beam splitting structure and circular air holes-based self-collimating structure. By inserting the polarization beam splitting structure into the self-collimating structure, the TE and TM polarized lights are orthogonally separated at their junction. When the number of rows in the hypotenuse of the inserted rectangular holes is 5, the transmittance of TE polarized light at 1550 nm is 95.4% and the corresponding polarization extinction ratio is 23 dB; on the other hand, the transmittance of TM polarized light is 88.5% and the corresponding polarization extinction ratio is 37 dB. For TE and TM polarized lights covering a 100 nm bandwidth, the TE and TM polarization extinction ratios are higher than 18 dB and 30 dB, respectively. Compared with the previous polarization beam splitters, our structure is simple, the size is small, and the extinction ratio is high, which meets the needs of modern optical communications, optical interconnection, and optical integrated systems.

scholarly journals Estimación Espectral de Series de Tiempo de Absorbancia Uv-Vis para el Monitoreo de Calidad de Aguas

Ingeniería ◽  
2017 ◽  
Vol 22 (2) ◽  
pp. 211
Author(s):  
Leonardo Plazas-Nossa ◽  
Miguel Antonio Ávila Angulo ◽  
Andres Torres
Keyword(s):  
Time Series ◽  
Fourier Transform ◽  
Multivariate Time Series ◽  
Treatment Plant ◽  
Visible Range ◽  
Wide Sense ◽  
Sample Number ◽  
San Fernando ◽  
Study Sites ◽  
Box Cox Transformation

Context: Signals recorded as multivariate time series by UV-Vis absorbance captors installed in urban sewer systems, can be non-stationary, yielding complications in the analysis of water quality monitoring. This work proposes to perform spectral estimation using the Box-Cox transformation and differentiation in order to obtain stationary multivariate time series in a wide sense. Additionally, Principal Component Analysis (PCA) is applied to reduce their dimensionality.Method: Three different UV-Vis absorbance time series for different Colombian locations were studied: (i) El-Salitre Wastewater Treatment Plant (WWTP) in Bogotá; (ii) Gibraltar Pumping Station (GPS) in Bogotá; and (iii) San-Fernando WWTP in Itagüí. Each UV-Vis absorbance time series had equal sample number (5705). The esti-mation of the spectral power density is obtained using the average of modified periodograms with rectangular window and an overlap of 50%, with the 20 most important harmonics from the Discrete Fourier Transform (DFT) and Inverse Fast Fourier Transform (IFFT).Results: Absorbance time series dimensionality reduction using PCA, resulted in 6, 8 and 7 principal components for each study site respectively, altogether explaining more than 97% of their variability. Values of differences below 30% for the UV range were obtained for the three study sites, while for the visible range the maximum differences obtained were: (i) 35% for El-Salitre WWTP; (ii) 61% for GPS; and (iii) 75% for San-Fernando WWTP.Conclusions: The Box-Cox transformation and the differentiation process applied to the UV-Vis absorbance time series for the study sites (El-Salitre, GPS and San-Fernando), allowed to reduce variance and to eliminate ten-dency of the time series. A pre-processing of UV-Vis absorbance time series is recommended to detect and remove outliers and then apply the proposed process for spectral estimation.Language: Spanish.

High-Precision Polarizing Beam Splitting System Based on Polarizing Beam Splitter

2016 ◽  
Vol 43 (12) ◽  
pp. 1210001
Author(s):  
罗敬 Luo Jing ◽  
刘东 Liu Dong ◽  
徐沛拓 Xu Peituo ◽  
白剑 Bai Jian ◽  
刘崇 Liu Chong ◽  
...  
Keyword(s):  
High Precision ◽  
Beam Splitter ◽  
Beam Splitting ◽  
Polarizing Beam Splitter ◽  
Splitting System

scholarly journals The Pulsation of M-type Miras: Multi-Epoch ISO-SWS Observations and Dynamical Models

2002 ◽  
Vol 185 ◽  
pp. 538-541 ◽  
Author(s):  
B. Aringer ◽  
U.G. Jørgensen ◽  
F. Kerschbaum ◽  
J. Hron ◽  
S. Höfner
Keyword(s):  
Time Series ◽  
Radiative Transfer ◽  
Wavelength Range ◽  
Infrared Range ◽  
Dynamical Models ◽  
Long Period ◽  
Mira Variables ◽  
Long Period Variables ◽  
Hydrostatic Model ◽  
Additional Assumptions

AbstractWe present time series of observed and synthetic ISO-SWS spectra of oxygen-rich Mira variables covering the wavelength range between 2.36 and 7.75 μm. The calculations are based on new dynamical models, which have been computed with a non-grey radiative transfer taking into account all relevant molecular opacities. It turns out that many features in the ISO spectra of cool long period variables which could not be reproduced within the framework of classical hydrostatic model atmospheres nor with grey dynamical calculations can now be understood without any additional assumptions. This is especially true for the water bands, which dominate the opacity in the infrared range of M-type Miras.

A novel beam splitter based on graded photonic crystals

2014 ◽  
Vol 28 (23) ◽  
pp. 1450171 ◽  
Author(s):  
L. H. Wang ◽  
X. L. Yang ◽  
X. F. Meng ◽  
Y. R. Wang ◽  
Z. Huang ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Beam Splitter ◽  
Square Lattice ◽  
Beam Splitting ◽  
Splitting Ratio ◽  
Application Potential ◽  
Wave Methods ◽  
The Relationship ◽  
Optical Integration ◽  
Difference Time

This study proposes a novel beam splitter system based on graded photonic crystals, wherein the GPCs are part of a circular PC. A self-collimating PC structure with a square lattice is added to improve transmissivity. The total transmissivity is increased by extending the defect of the self-collimating PC. This study presents a beam splitter system with low energy loss and the best total transmissivity of almost 90%. Furthermore, the relationship between the beam-splitting ratio and the light position is discovered, and the beam-splitting ratio may be changed discretionarily and expediently. Numerical results are obtained using finite-difference time domain and plane wave methods. The proposed structure has significant application potential in optical integration.

Luminescence from erbium oxide grown on silicon

2001 ◽  
Vol 692 ◽  
Author(s):  
E. Nogales ◽  
B. Méndez ◽  
J. Piqueras ◽  
R. Plugaru ◽  
J. A. García ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Luminescence Spectra ◽  
Visible Range ◽  
Infrared Range ◽  
Silicon Substrates ◽  
Thermal Treatments ◽  
Erbium Oxide ◽  
Erbium Ions ◽  
Different Types ◽  
Substrate Properties

AbstractThe luminescence properties of erbium oxide grown on crystalline and amorphous silicon substrates were studied by means of photo- and cathodoluminescence techniques. Differences in the luminescence spectra for samples grown on the two types of substrates used are explained in terms of the different types of erbium centers formed by taking into account the substrate properties and the thermal treatments during growth. For comparison, erbium implanted and oxygen coimplanted crystalline and amorphous silicon have been also investigated by luminescence techniques. In the implanted samples, the sharp transitions from erbium ions in the visible range were quenched and the main emission corresponds to the intraionic transitions in Er3+ ions in the infrared range peaked at 1,54 μm.

Nonthermal combined ultraviolet and vacuum-ultraviolet curing process for organosilicate dielectrics

2016 ◽  
Vol 108 (24) ◽  
pp. 242906 ◽  
Author(s):  
H. Zheng ◽  
X. Guo ◽  
D. Pei ◽  
W. Li ◽  
J. Blatz ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Curing Process ◽  
Ultraviolet Curing

scholarly journals Diffraction mechanism of five-port transmission gratings

2020 ◽  
Vol 50 (4) ◽  
Author(s):  
Chenhao Gao ◽  
Bo Wang ◽  
Kunhua Wen ◽  
Ziming Meng ◽  
Qu Wang ◽  
...  
Keyword(s):  
Beam Splitter ◽  
Diffraction Order ◽  
Normal Incidence ◽  
Propagation Mechanism ◽  
Beam Splitting ◽  
Transmission Grating ◽  
Process Tolerance ◽  
Wide Range ◽  
Rigorous Coupled Wave ◽  
Modal Method

This paper designs a five-port transmission grating under normal incidence. Rigorous coupled-wave approach is used to optimize the grating parameters. The energy of the grating is mainly dispersed to the 0th, ±1st and ±2nd orders. The efficiency of each diffraction order under both polarizations is close to 20%. The modal method is used to describe the propagation mechanism of the two polarized lights in the grating, and the diffraction behavior of the grating is analyzed. In addition, the grating has a wide range of incident characteristics and a large process tolerance. Therefore, this five-port beam splitter with a connecting layer will be a good polarization-independent beam splitting device.

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