scholarly journals Evaluation of a Spatial Heterodyne Spectrometer for Raman Spectroscopy of Minerals

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 202
Author(s):  
Alina Zettner ◽  
Ardian B. Gojani ◽  
Thomas Schmid ◽  
Igor B. Gornushkin
Keyword(s):  
Raman Spectroscopy ◽  
Spectral Analysis ◽  
Theoretical Basis ◽  
Resolving Power ◽  
Copper Ore ◽  
Handheld Device ◽  
Heterodyne Spectroscopy ◽  
Analysis Technique ◽  
Heterodyne Spectrometer ◽  
Better Than

Spatial heterodyne spectroscopy (SHS) is a novel spectral analysis technique that is being applied for Raman spectroscopy of minerals. This paper presents the theoretical basis of SHS and its application for Raman measurements of calcite, quartz and forsterite in marble, copper ore and nickel ore, respectively. The SHS measurements are done using a broadband (518–686 nm) and resolving power R ≈ 3000 instrument. The spectra obtained using SHS are compared to those obtained by benchtop and modular dispersive spectrometers. It is found that SHRS performance in terms of resolution is comparable to that of the benchtop spectrometer and better than the modular dispersive spectrometer, while the sensitivity of SHRS is worse than that of a benchtop spectrometer, but better than that of a modular dispersive spectrometer. When considered that SHS components are small and can be packaged into a handheld device, there is interest in developing an SHS-based instrument for mobile Raman spectroscopy. This paper evaluates the possibility of such an application.

scholarly journals An Improved Method for Discerning Broken Rotor Bar Fault and Load Oscillation in Induction Motors

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3130 ◽  
Author(s):  
Liling Sun ◽  
Boqiang Xu
Keyword(s):  
Spectral Analysis ◽  
Theoretical Basis ◽  
Induction Motors ◽  
The Other ◽  
Improved Method ◽  
Broken Rotor Bar ◽  
Signal Parameters ◽  
Analysis Technique ◽  
Novel Strategy ◽  
The One

A few methods for discerning broken rotor bar (BRB) fault and load oscillation in induction motors have been reported in the literature. However, they all perhaps inevitably fail in adverse cases in which these two phenomena are simultaneously present. To tackle this problem, an improved method for discerning BRB fault and load oscillation is proposed in this paper based on the following work. On the one hand, the theoretical basis is analytically extended to include such an adverse case, yielding some important findings on the spectra of the instantaneous reactive and active powers. A novel strategy is thus outlined to correctly discern BRB fault and load oscillation even when simultaneously present. On the other hand, Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT) is adopted as the spectral analysis technique to deal with the instantaneous reactive and active powers, yielding a certain improvement compared to the existing methods, adopting Fast Fourier Transform (FFT). Simulation and experimental results demonstrate that the proposed method can correctly discern BRB fault and load oscillation even when simultaneously present.

scholarly journals Nanoscale Spatial Resolution in Far-Field Raman Imaging Using Hyperspectral Unmixing in Combination with Positivity Constrained Super-Resolution

2020 ◽  
Vol 74 (7) ◽  
pp. 780-790
Author(s):  
Dominik J. Winterauer ◽  
Daniel Funes-Hernando ◽  
Jean-Luc Duvail ◽  
Saïd Moussaoui ◽  
Tim Batten ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Resolution ◽  
Single Channel ◽  
Near Field ◽  
Resolution Enhancement ◽  
Super Resolution ◽  
Resolving Power ◽  
Far Field ◽  
Hyperspectral Unmixing ◽  
Better Than

This work introduces hyper-resolution (HyRes), a numerical approach for spatial resolution enhancement that combines hyperspectral unmixing and super-resolution image restoration (SRIR). HyRes yields a substantial increase in spatial resolution of Raman spectroscopy while simultaneously preserving the undistorted spectral information. The resolving power of this technique is demonstrated on Raman spectroscopic data from a polymer nanowire sample. Here, we demonstrate an achieved resolution of better than 14 nm, a more than eightfold improvement on single-channel image-based SRIR and [Formula: see text] better than regular far-field Raman spectroscopy, and comparable to near-field probing techniques.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Resolution and measurement in the scanning electron microscope

1987 ◽  
Vol 45 ◽  
pp. 534-537 ◽  
Author(s):  
Michael T. Postek
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Engineering Design ◽  
Resolving Power ◽  
Practical Applications ◽  
Instrument Resolution ◽  
Accurate Definition ◽  
Definition Of ◽  
Scanning Electron ◽  
Better Than

The term ultimate resolution or resolving power is the very best performance that can be obtained from a scanning electron microscope (SEM) given the optimum instrumental conditions and sample. However, as it relates to SEM users, the conventional definitions of this figure are ambiguous. The numbers quoted for the resolution of an instrument are not only theoretically derived, but are also verified through the direct measurement of images on micrographs. However, the samples commonly used for this purpose are specifically optimized for the measurement of instrument resolution and are most often not typical of the sample used in practical applications.SEM RESOLUTION. Some instruments resolve better than others either due to engineering design or other reasons. There is no definitively accurate definition of how to quantify instrument resolution and its measurement in the SEM.

scholarly journals ESA’s X-Ray Astronomy Mission, XMM

1990 ◽  
Vol 123 ◽  
pp. 129-140
Author(s):  
B.G. Taylor ◽  
A. Peacock
Keyword(s):  
Resolving Power ◽  
Science Program ◽  
Eccentric Orbit ◽  
Ccd Cameras ◽  
Optical Telescope ◽  
X Ray ◽  
Medium Resolution ◽  
Reflection Gratings ◽  
Better Than

AbstractESA’s X-ray Astronomy Mission, XMM, scheduled for launch in 1998, is the second of four cornerstones of ESA’s long term science program Horizon 2000. Covering the range from about 0.1 to 10 keV, it will provide a high throughput of 5000 cm2 at 7 keV with three independant telescopes, and have a spatial resolution better than 30 arcsec. Broadband spectrophotometry is provided by CCD cameras while reflection gratings provide medium resolution spectroscopy (resolving power of about 400) in the range 0.3–3 keV. Long uninterrupted observations will be made from the 24 hr period, highly eccentric orbit, reaching a sensitivity approaching 10−15 erg cm−2 s−1 in one orbit. A 30 cm UV/optical telescope is bore-sighted with the x-ray telescopes to provide simultaneous optical counterparts to the numerous serendipitous X-ray sources which will be detected during every observation.

HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: I. EXPERIMENTAL METHODS

1954 ◽  
Vol 32 (5) ◽  
pp. 330-338 ◽  
Author(s):  
B. P. Stoicheff
Keyword(s):  
Raman Spectroscopy ◽  
High Resolution ◽  
Magnesium Oxide ◽  
Raman Spectra ◽  
Experimental Methods ◽  
Resolving Power ◽  
Polar Molecules ◽  
High Current ◽  
Rotational Constants ◽  
Moments Of Inertia

An apparatus for obtaining intense Raman spectra of gases excited by the Hg 4358 line is described. It consists of a mirror-type Raman tube irradiated by two high-current mercury lamps, completely enclosed in a reflector of magnesium oxide. The lamps are externally water-cooled along their entire length and emit sharp lines of high intensity.Rotational Raman spectra of gases at a pressure of 1 atm. have been photographed in the second order of a 21 ft. grating in exposure times of 6 to 24 hr. The Raman lines are sharp and a resolving power of about 100,000 has been achieved. It will be possible to resolve the rotational Raman spectra, and hence to evaluate the rotational constants of molecules having moments of inertia of up to 300 × 10−10 gm. cm.2 Such investigations will be especially useful for non-polar molecules.

Development of Deep Learning Algorithms to Discriminate Giant Cell Tumor of Bone from Adjacent Normal Tissues by Confocal Raman Spectroscopy

The Analyst ◽  
2022 ◽  
Author(s):  
Carol PY Lau ◽  
Wenao Ma ◽  
Kwan Yau Law ◽  
Maribel Lacambra ◽  
Kwok Chuen Wong ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Giant Cell Tumor ◽  
Giant Cell ◽  
Chemical Structure ◽  
Cell Tumor ◽  
Confocal Raman Spectroscopy ◽  
Normal Tissues ◽  
Analysis Technique ◽  
Destructive Analysis ◽  
Non Destructive

Raman spectroscopy is a non-destructive analysis technique that provides detailed information about the chemical structure of the tumor. Raman spectra of 52 giant cell tumor of bone (GCTB), and 21...

scholarly journals PENERAPAN MODEL PEMBELAJARAN THINK TALK WRITE (TTW) TERHADAP KEMAMPUAN KOMUNIKASI MATEMATIS SISWA

2019 ◽  
Vol 4 (2) ◽  
pp. 190-195
Author(s):  
Fitri Ramadhani ◽  
Delima Septiani
Keyword(s):  
Middle School ◽  
Communication Skills ◽  
Hypothesis Test ◽  
Control Group ◽  
Learning Models ◽  
Mathematical Communication ◽  
Control Group Design ◽  
Group Design ◽  
Analysis Technique ◽  
Better Than

Abstract. The purpose of this study was to determine the mathematical communication skills of class VII students at Muhammadiyah Middle School in Pasir Penyu. This type of research is a Quasi Experiment with the design of Randomized Subject Posttest-Only Control Group Design. The data analysis technique in this test uses the t-test. Based on the calculation of the hypothesis test shows the significant value of the sample class is 0.003 <0.05. Based on these results, H0 is rejected and Ha is accepted. So it can be concluded that the mathematical communication skills of students using the think talk write learning model is better than the mathematical communication skills of students using conventional learning models in class VII in the middle school Muhammadiyah Pasir Penyu.Keywords: Mathematical Communication, Think Talk Write

scholarly journals PENGARUH MODEL PEMBELAJARAN RECIPROCAL TEACHING TERHADAP HASIL BELAJAR MATEMATIKA DITINJAU DARI KEMANDIRIAN BELAJAR PESERTA DIDIK

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Laila Hidayah ◽  
Satrio Wicaksono Sudarman ◽  
Ira Vahlia
Keyword(s):  
Data Analysis ◽  
Learning Outcomes ◽  
Mathematics Learning ◽  
Reciprocal Teaching ◽  
Teaching Model ◽  
Learning Models ◽  
High Learning ◽  
Analysis Technique ◽  
And Mathematics ◽  
Better Than

The study aims to find out 1) whether or not there is an effect of the Reciprocal Teaching model on students' mathematics learning outcomes. 2) which ones have good mathematical learning outcomes between those who have high, moderate learning independence. 3) interactions between Reciprocal Teaching and conventional learning models. The data analysis technique uses hypothesis testing of two-way anava with unequal cells. Research conclusions: 1) There is an influence of mathematics learning outcomes between those who learn using the Reciprocal Teaching and conventional learning models. 2) Mathematics learning outcomes that have high learning independence are better than those with moderate learning independence and mathematics learning outcomes that have moderate independence are better than those with low learning independence. 3) There is an interaction between Reciprocal Teaching and conventional learning models and learning independence on mathematics learning outcomes in those who have high, medium and low learning independence.

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