Full-Field Refractive Index Variation Measurement Based on Phase Shift Interferometry and SPR Phase Detection

2017 ◽  
Vol 870 ◽  
pp. 9-14
Author(s):  
You Shen Lin ◽  
Ming Hung Chiu
Keyword(s):  
Refractive Index ◽  
Phase Shift ◽  
Phase Measurement ◽  
Phase Detection ◽  
New Approach ◽  
Full Field ◽  
Spr Sensor ◽  
Angle Deviation ◽  
Test Light ◽  
Short Time

We propose a new approach for determining the distribution of full-field refractive index based on the angle deviation method (ADM) with a surface plasmon resonance (SPR) sensor in phase detection. The inhomogeneous distribution of refractive index causes the variant deviation angles in the test light. SPR sensor is a sensitive angular sensor especially for phase detection. For the full–field phase measurement, we should use the four-step phase shift interferometry (PSI) to measure the phase shift profile of the test light after reflected from the SPR sensor. Thus the phase shift is caused by the variation of the refractive index. The approach can plot the full-field refractive index distribution in a short time and its resolution can be better than 2.2×10-8 (RIU).

Full-field refractive index measurement with simultaneous phase-shift interferometry

Optik ◽  
2014 ◽  
Vol 125 (13) ◽  
pp. 3307-3310 ◽  
Author(s):  
Yen-Chang Chu ◽  
Wei-Yao Chang ◽  
Kun-Huang Chen ◽  
Jing-Heng Chen ◽  
Bo-Chung Tsai ◽  
...  
Keyword(s):  
Refractive Index ◽  
Phase Shift ◽  
Refractive Index Measurement ◽  
Full Field ◽  
Index Measurement

scholarly journals Gait Phase Detection Based on Muscle Deformation with Static Standing-Based Calibration

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1081
Author(s):  
Tamon Miyake ◽  
Shintaro Yamamoto ◽  
Satoshi Hosono ◽  
Satoshi Funabashi ◽  
Zhengxue Cheng ◽  
...  
Keyword(s):  
Learning Algorithm ◽  
Detection System ◽  
Calibration Method ◽  
Detection Algorithm ◽  
Video Data ◽  
Detection Accuracy ◽  
Phase Detection ◽  
Gait Phase ◽  
Logistic Regression Algorithm ◽  
Short Time

Gait phase detection, which detects foot-contact and foot-off states during walking, is important for various applications, such as synchronous robotic assistance and health monitoring. Gait phase detection systems have been proposed with various wearable devices, sensing inertial, electromyography, or force myography information. In this paper, we present a novel gait phase detection system with static standing-based calibration using muscle deformation information. The gait phase detection algorithm can be calibrated within a short time using muscle deformation data by standing in several postures; it is not necessary to collect data while walking for calibration. A logistic regression algorithm is used as the machine learning algorithm, and the probability output is adjusted based on the angular velocity of the sensor. An experiment is performed with 10 subjects, and the detection accuracy of foot-contact and foot-off states is evaluated using video data for each subject. The median accuracy is approximately 90% during walking based on calibration for 60 s, which shows the feasibility of the static standing-based calibration method using muscle deformation information for foot-contact and foot-off state detection.

scholarly journals Earthquake forecasting and its verification

2005 ◽  
Vol 12 (6) ◽  
pp. 965-977 ◽  
Author(s):  
J. R. Holliday ◽  
K. Z. Nanjo ◽  
K. F. Tiampo ◽  
J. B. Rundle ◽  
D. L. Turcotte
Keyword(s):  
Temporal Variations ◽  
Earthquake Forecasting ◽  
Earthquake Risk ◽  
Decision Threshold ◽  
New Approach ◽  
Pi Method ◽  
Time Prediction ◽  
Short Time ◽  
Large Earthquakes ◽  
Proven Method

Abstract. No proven method is currently available for the reliable short time prediction of earthquakes (minutes to months). However, it is possible to make probabilistic hazard assessments for earthquake risk. In this paper we discuss a new approach to earthquake forecasting based on a pattern informatics (PI) method which quantifies temporal variations in seismicity. The output, which is based on an association of small earthquakes with future large earthquakes, is a map of areas in a seismogenic region ("hotspots'') where earthquakes are forecast to occur in a future 10-year time span. This approach has been successfully applied to California, to Japan, and on a worldwide basis. Because a sharp decision threshold is used, these forecasts are binary--an earthquake is forecast either to occur or to not occur. The standard approach to the evaluation of a binary forecast is the use of the relative (or receiver) operating characteristic (ROC) diagram, which is a more restrictive test and less subject to bias than maximum likelihood tests. To test our PI method, we made two types of retrospective forecasts for California. The first is the PI method and the second is a relative intensity (RI) forecast based on the hypothesis that future large earthquakes will occur where most smaller earthquakes have occurred in the recent past. While both retrospective forecasts are for the ten year period 1 January 2000 to 31 December 2009, we performed an interim analysis 5 years into the forecast. The PI method out performs the RI method under most circumstances.

scholarly journals Enhancement of Region of Interest CT Reconstructions through Multimodal Data

2018 ◽  
Vol 4 (1) ◽  
pp. 331-335
Author(s):  
David Schote ◽  
Tim Pfeiffer ◽  
Georg Rose
Keyword(s):  
Substantial Reduction ◽  
Region Of Interest ◽  
Proof Of Concept ◽  
Multimodal Data ◽  
New Approach ◽  
Full Field ◽  
Lack Of Information ◽  
Ct Data ◽  
Flight Measurements

AbstractComputed tomography (CT) scans are frequently used intraoperatively, for example to control the positioning of implants during intervention. Often, to provide the required information, a full field of view is unnecessary. I nstead, the region-of-interest (ROI) imaging can be performed, allowing for substantial reduction in the applied X-ray dose. However, ROI imaging leads to data inconsistencies, caused by the truncation of the projections. This lack of information severely impairs the quality of the reconstructed images. This study presents a proof-of-concept for a new approach that combines the incomplete CT data with ultrasound data and time of flight measurements in order to restore some of the lacking information. The routine is evaluated in a simulation study using the original Shepp-Logan phantom in ROI cases with different degrees of truncation. Image quality is assessed by means of normalized root mean square error. The proposed method significantly reduces truncation artifacts in the reconstructions and achieves considerable radiation exposure reductions.

A Novel Approach to Nanoscale Materials Synthesis Using Industrial Laser Processing of Organosilazane Liquid Precursors

1990 ◽  
Vol 206 ◽  
Author(s):  
Tongsan D. Xiao ◽  
Peter R. Strutt ◽  
Kenneth E. Gonsalves
Keyword(s):  
Ceramic Powder ◽  
Average Diameter ◽  
Current Approach ◽  
Powder Materials ◽  
Materials Synthesis ◽  
Laser Plume ◽  
New Approach ◽  
Novel Approach ◽  
Liquid Precursors ◽  
Short Time

ABSTRACTA new approach has been developed for the synthesis of nanoscale ceramic powder materials from liquid organosilazane precursors. This technique, by exploiting fast kinetic chemical and physical reactions, makes it possible to synthesize significant quantities of material in a relatively short time. In the current approach aerosols of a silazane monomer, (CH3SiHNH)n, (n = 3 or 4), of mol. wt. 280–320, are injected into the beam of a cw industrial CO2 laser to obtain nanoscale ceramic powders. Injection of the aerosol into the laser-beam results in a high-temperature plume. Rapid condensation of the molecular precursor species emerging from the laser plume results in the formation of preceramic polymer particles, with an average diameter of 62 nm. One attractive feature of this process is that 70 wt.% of the liquid precursor is converted into nanoscale powders. Another feature is that only a further 10 wt.% loss occurs during post thermal treatment to form the end-product.

scholarly journals General solutions of the theme “Light propagation in optical uniaxial crystals”

2017 ◽  
Vol 1 (T3) ◽  
pp. 79-89
Author(s):  
Nghia Quang Truong ◽  
Huong Tu Ngoc Nguyen
Keyword(s):  
Refractive Index ◽  
Light Propagation ◽  
New Approach ◽  
General Solutions ◽  
To Receive ◽  
Analytical Expressions

In this article, we introduce a new approach to receive general solutions which describe all of the properties of the light propagating across optical uniaxial crystals. In our approach we do not use the conception of refractive index ellipsoid as being done in references. The solutions are given in analytical expressions so we can handly calculate or writing a small program to compute these expressions.

scholarly journals Ultrasensitive Biosensor with Hyperbolic Metamaterials Composed of Silver and Zinc Oxide

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2220
Author(s):  
Shuhan Chen ◽  
Shiqi Hu ◽  
Yichen Wu ◽  
Dingnan Deng ◽  
Yunhan Luo ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Refractive Index ◽  
Figure Of Merit ◽  
Incidence Angle ◽  
Interaction Strength ◽  
Physical Reason ◽  
Filling Fraction ◽  
Electric Field Amplitude ◽  
Spr Sensor ◽  
Biochemical Sensing

We propose a hyperbolic metamaterial-based surface plasmon resonance (HMM-SPR) sensor by composing a few pairs of alternating silver (Ag) and zinc oxide (ZnO) layers. Aiming to achieve the best design for the sensor, the dependence of the sensitivity on the incidence angle, the thickness of the alternating layer and the metal filling fraction are explored comprehensively. We find that the proposed HMM-SPR sensor achieves an average sensitivity of 34,800 nm per refractive index unit (RIU) and a figure of merit (FOM) of 470.7 RIU−1 in the refractive index ranging from 1.33 to 1.34. Both the sensitivity (S) and the FOM show great enhancement when compared to the conventional silver-based SPR sensor (Ag-SPR). The underlying physical reason for the higher performance is analyzed by numerical simulation using the finite element method. The higher sensitivity could be attributed to the enhanced electric field amplitude and the increased penetration depth, which respectively increase the interaction strength and the sensing volume. The proposed HMM-SPR sensor with greatly improved sensitivity and an improved figure of merit is expected to find application in biochemical sensing due to the higher resolution.

scholarly journals PENYULUHAN DEMAM BERDARAH DENGUE (DBD) KEPADA PELAJAR-PELAJAR DI PERGURUAN KRISTEN METHODIST-2 RANTAUPRAPAT

2021 ◽  
Vol 2 (1) ◽  
pp. 33-41
Author(s):  
Saharnauli Janna Verawaty Simorangkir
Keyword(s):  
Dengue Virus ◽  
Dengue Fever ◽  
Mosquito Vectors ◽  
Public Concern ◽  
New Approach ◽  
Dengue Disease ◽  
Agents Of Change ◽  
Agent Of Change ◽  
Short Time ◽  
Activity Method

Abstrak Penyakit demam berdarah merupakan salah satu masalah kesehatan di Kota Medan yang cenderung menimbulkan kekhawatiran masyarakat karena perjalanan penyakitnya cepat dan dapat menyebabkan kematian dalam waktu yang singkat. Penyakit demam berdarah adalah penyakit yang disebabkan oleh virus dengue. Virus ini ditularkan melalui vector nyamuk. Pendekatan pemberantasan demam berdarah yang berwawasan kepedulian masyarakat merupakan salah satu alternatif pendekatan baru dalam rangka pengendalian penyebaran penyakit ini. Tujuan dari kegiatan ini adalah untuk memberikan penjelasan kepada pelajar-pelajar yang diharapkan dapat menjadi agent of change di lingkungannya dalam pemberantasan penyakit DBD ini. Metode kegiatan ini dilaksanakan dalam bentuk penyuluah, tanya jawab dan games. Kegiatan ini dinilai cukup berhasil. Indikator keberhasilannya adalah berdasarkan antusiasme peserta untuk bertanya dan feedback dari peserta yang menyatakan penyuluhan ini dinilai menarik dan bermanfaat. Kesimpulan dari kegiatan ini adalah melalui keilmuan yang dimiliki dapat digunakan untuk membantu memberikan pemahaman mengenai penyakit-penyakit kepada masyarakat, yang pada akhirnya dapat mendorong partisipasi masyarakat dalam pencegahan penularan dan pertambahan kasus-kasus penyakit tertentu di masyarakat Abstract Dengue fever is one of the health problems in Medan City which tends to cause public concern because the disease progresses quickly and can cause death in a short time. Dengue fever is a disease caused by the dengue virus. This virus is transmitted by mosquito vectors. The approach to eradicating dengue fever with a public concern is an alternative to a new approach to control the spread of this disease. The purpose of this activity is to provide explanations to students who are expected to become agents of change in their environment in eradicating this dengue disease. This activity method was carried out in the form of counseling, question and answer and games. This activity was considered quite successful. The success indicator was based on the enthusiasm of the participants to asked questions and feedback from the participants who stated that this counseling was considered interesting and useful. The conclusion of this activity was that through the knowledge that is owned it can be used to help provide an understanding of diseases to the community, which in turn can encourage community participation in preventing the transmission of certain diseases in the community.

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