Relevant bibliographies by topics / Raman spectra measurement

Academic literature on the topic 'Raman spectra measurement'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Raman spectra measurement"

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Zhou, Qian, Zhiyong Zou, and Lin Han. "Deep Learning-Based Spectrum Reconstruction Method for Raman Spectroscopy." Coatings 12, no. 8 (August 22, 2022): 1229. http://dx.doi.org/10.3390/coatings12081229.

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Raman spectroscopy, measured by a Raman spectrometer, is usually disturbed by the instrument response function and noise, which leads to certain measurement error and further affects the accuracy of substance identification. In this paper, we propose a spectral reconstruction method which combines the existing maximum a posteriori (MAP) method and deep learning (DL) to recover the degraded Raman spectrum. The proposed method first employs the MAP method to reconstruct the measured Raman spectra, so as to obtain preliminary estimated Raman spectra. Then, a convolutional neural network (CNN) is trained by using the preliminary estimated Raman spectra and the real Raman spectra to learn the mapping from the preliminary estimated Raman spectra to the real Raman spectra, so as to achieve a better spectral reconstruction effect than merely using the MAP method or a CNN. To prove the effectiveness of the proposed spectral reconstruction method, we employed the proposed method and some traditional spectral reconstruction methods to reconstruct the simulated and measured Raman spectra, respectively. The experimental results show that compared with traditional methods, the estimated Raman spectra reconstructed by the proposed method are closer to the real Raman spectra.
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Narita, Yoshihito, Toshiyasu Tadokoro, Teruki Ikeda, Toshiharu Saiki, Syuji Mononobe, and Motoichi Ohtsu. "Near-Field Raman Spectral Measurement of Polydiacetylene." Applied Spectroscopy 52, no. 9 (September 1998): 1141–44. http://dx.doi.org/10.1366/0003702981945101.

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Two-dimensional near-field Raman spectra and topographic images of the polydiacetylene surface are measured simultaneously by using a near-field Raman spectrometer. The spectra (located 100 nm apart) have different spectral features. The peak intensity ratio of two C=C peaks at 1520 and 1457 cm−1 does not correlate with the topographic image and shows differences in the subwavelength scale. These differences can be interpreted as spatial differences in the number of successive bonds on the polydiacetylene surface. In contrast, the near-field Raman intensity of the C=C bond at 1457 cm−1 correlates strongly with the topographic image. This phenomenon can be interpreted as a change in the efficiency of collecting Raman scattering light.
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Sun, Yuqi, Xiaotian Li, Jiri Galantu, Qihang Chu, Jun Chen, Zhongkai Liu, Xiaotao Mi, Xuefeng Yao, and Pan Li. "Terahertz Raman Measurements Using a Spatial Heterodyne Raman Spectrometer." Applied Sciences 11, no. 17 (August 31, 2021): 8094. http://dx.doi.org/10.3390/app11178094.

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We propose a method of measuring the terahertz (THz) Raman spectra of a material. As Raman spectroscopy is a measurement of the relative frequency spectrum relative to the frequency of the excitation source, sometimes it is not necessary to use an expensive THz source and THz detector. Instead, an ultraviolet, visible, or infrared excitation source and corresponding detector can be used. A combination of prisms and gratings is used to widen the field of view at high resolution. The resolution of the system is 4.945 cm−1 (0.149 THz), and the spectral range is 2531.84 cm−1 (75.963 THz). We measured the THz Raman spectra of solid powder, aqueous solutions, and mixtures, and studied the effects of environment, container material, and time of measurement on the spectra. The results show that the system is not significantly affected by interference from the water environment and has good stability and repeatability. This method can be applied in many fields such as material detection and environmental protection.
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Zhu, Shichao, Zhuoming Song, Shengyu Shi, Mengmeng Wang, and Gang Jin. "Fusion of Near-Infrared and Raman Spectroscopy for In-Line Measurement of Component Content of Molten Polymer Blends." Sensors 19, no. 16 (August 8, 2019): 3463. http://dx.doi.org/10.3390/s19163463.

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Spectral measurement techniques, such as the near-infrared (NIR) and Raman spectroscopy, have been intensively researched. Nevertheless, even today, these techniques are still sparsely applied in industry due to their unpredictable and unstable measurements. This paper put forward two data fusion strategies (low-level and mid-level fusion) for combining the NIR and Raman spectra to generate fusion spectra or fusion characteristics in order to improve the in-line measurement precision of component content of molten polymer blends. Subsequently, the fusion value was applied to modeling. For evaluating the response of different models to data fusion strategy, partial least squares (PLS) regression, artificial neural network (ANN), and extreme learning machine (ELM) were applied to the modeling of four kinds of spectral data (NIR, Raman, low-level fused data, and mid-level fused data). A system simultaneously acquiring in-line NIR and Raman spectra was built, and the polypropylene/polystyrene (PP/PS) blends, which had different grades and covered different compounding percentages of PP, were prepared for use as a case study. The results show that data fusion strategies improve the ANN and ELM model. In particular, mid-level fusion enables the in-line measurement of component content of molten polymer blends to become more accurate and robust.
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Ershova, Ksenia, Svetlana Kochemirovskaya, Natalia P. Kirillova, Vladimir Kochemirovsky, and Mikhail Ryazantsev. "Influence of Raman spectra measurement conditions on the dating results of writing compositions." Nowa Kodyfikacja Prawa Karnego 60 (February 1, 2022): 61–97. http://dx.doi.org/10.19195/2084-5065.60.5.

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When establishing the age of a document using spectral methods, the result is influenced not only by the storage conditions, but also by the methods of measuring the spectra and mathematical processing of the results. This work analyzes the influence the modes of measuring Raman spectra have on the result of measuring the writing composition spec-tra. The analysis area includes the correlation coefficients of the full spectral matrices as a criterion for the reliability of the determination date. The influence of focusing accuracy, correctness of subtraction of the baseline, sample irradiation time, and varying the number of repetitions is investigated. In the study, chemometric tools for the analysis of Raman spectra were also applied. The influence of mathematical spectra processing shows that the components PC4, P5, and PC6 are most closely related to the shelf life, although they do not make the maximum contribution to the variance in the system. Taking into account all the requirements for measuring spectra, the PCA method applied to the Raman spectra of writing compositions allows clustering samples by manufacturer’s brands and by the sample shelf life.
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Vlčková, Blanka, Bohuslav Strauch, and Milan Horák. "Measurement and interpretation of infrared and raman spectra of vanadyl acetylacetonate." Collection of Czechoslovak Chemical Communications 52, no. 3 (1987): 686–95. http://dx.doi.org/10.1135/cccc19870686.

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Infrared and Raman spectra of oxobis (2,4-pentandionate) vanadium complex have been studied. A reduction of the number of spectral bands observed in the IR and Raman spectra compared to the theoretical number of normal modes expected for a complex molecule is attributed to the isolation effect of the heavy central metal atom. A simplified model involving the skeleton of the complex and one coordinated ligand has been employed for an empirical interpretation of the vibrational spectra. An exact agreement between the number of modes predicted theoretically on the basis of the simplified model and the number of bands observed experimentally has been obtained.
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Wang, Alian, Jingyi Han, Lihe Guo, Jianyuan Yu, and Pei Zeng. "Database of Standard Raman Spectra of Minerals and Related Inorganic Crystals." Applied Spectroscopy 48, no. 8 (August 1994): 959–68. http://dx.doi.org/10.1366/0003702944029640.

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Establishing a standard Raman spectral database for minerals and related inorganic crystals is a very important basis for further increasing the applications of Raman spectroscopy in the geosciences. However, the Raman spectral pattern of a crystal is a function not only of its composition and structure but also of the scattering geometry during the measurement. Therefore, the standard Raman spectrum of a crystal must be measured under well-defined standard conditions. It would be of great interest to establish a standard measuring configuration with which the characteristic Raman spectra of all mineral crystals could be obtained. Factor-group analysis of the main types of minerals indicates that almost all of them possess a Raman-active totally symmetric (TS) vibrational mode. Therefore, we propose a scheme to measure standard Raman spectra under a scattering geometry set up on the basis of these TS modes. Using this scheme, we were able to establish a database for standard Raman spectra of minerals and related inorganic crystals.
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Liu, Fuchao, and Fan Yi. "Spectrally-Resolved Raman Lidar to Measure Atmospheric Three-Phase Water Simultaneously." EPJ Web of Conferences 237 (2020): 06017. http://dx.doi.org/10.1051/epjconf/202023706017.

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We report on a spectrally-resolved Raman lidar that can simultaneously profile backscattered Raman spectrum signals from water vapor, water droplets and ice crystals as well as aerosol fluorescence in the atmosphere. The lidar emits a 354.8-nm ultraviolet laser radiation and samples echo signals in the 393.0-424.0 nm wavelength range with a 1.0-nm spectral resolution. A spectra decomposition method is developed to retrieve fluorescence spectra, water vapor Raman spectra and condensed (liquid and/or ice) water Raman spectra successively. Based on 8 different clear-sky nighttime measurement results, the entire atmospheric water vapor Raman spectra are for the first time obtained by lidar. The measured normalized water vapor Raman spectra are nearly invariant and can serve as background reference for atmospheric water phase state identification under various weather conditions. For an ice virga event, it’s found the extracted condensed water Raman spectra are highly similar in shape to theoretical ice water Raman spectra reported by Slusher and Derr (1975). In conclusion, the lidar provides an effective way to measure three-phase water simultaneously in the atmosphere and to study of cloud microphysics as well as interaction between aerosols and clouds.
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HIGUCHI, Seiichiro. "Measurement of Raman spectra of optical fibers." Journal of the Spectroscopical Society of Japan 34, no. 6 (1985): 381–82. http://dx.doi.org/10.5111/bunkou.34.381.

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Houhou, Rola, Petra Rösch, Jürgen Popp, and Thomas Bocklitz. "Comparison of functional and discrete data analysis regimes for Raman spectra." Analytical and Bioanalytical Chemistry 413, no. 22 (May 15, 2021): 5633–44. http://dx.doi.org/10.1007/s00216-021-03360-1.

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AbstractRaman spectral data are best described by mathematical functions; however, due to the spectroscopic measurement setup, only discrete points of these functions are measured. Therefore, we investigated the Raman spectral data for the first time in the functional framework. First, we approximated the Raman spectra by using B-spline basis functions. Afterwards, we applied the functional principal component analysis followed by the linear discriminant analysis (FPCA-LDA) and compared the results with those of the classical principal component analysis followed by the linear discriminant analysis (PCA-LDA). In this context, simulation and experimental Raman spectra were used. In the simulated Raman spectra, normal and abnormal spectra were used for a classification model, where the abnormal spectra were built by shifting one peak position. We showed that the mean sensitivities of the FPCA-LDA method were higher than the mean sensitivities of the PCA-LDA method, especially when the signal-to-noise ratio is low and the shift of the peak position is small. However, for a higher signal-to-noise ratio, both methods performed equally. Additionally, a slight improvement of the mean sensitivity could be shown if the FPCA-LDA method was applied to experimental Raman data.
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Dissertations / Theses on the topic "Raman spectra measurement"

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Góes, Rafael Eleodoro de. "Detecção de glifosato em água por reconhecimento de padrões em espectroscopia assistida por nanopartículas de prata fabricadas por ablação a laser." Universidade Tecnológica Federal do Paraná, 2018. http://repositorio.utfpr.edu.br/jspui/handle/1/3011.

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A água é um recurso natural que, apesar de abundante, tem sofrido grande restrição em sua disponibilidade por conta da atividade humana, principalmente a agricultura. A garantia de conformidade da água que é distribuída à população quanto aos níveis tidos como seguros para a presença de contaminantes é, portanto, uma questão de saúde pública e que tem atraído grande atenção. De modo a detectar substâncias potencialmente nocivas, complexos procedimentos de química analítica são utilizados para a verificação e emissão de laudos de conformidade, utilizados para a tomada de decisão em relação à sua potabilidade. Neste cenário há demanda para métodos auxiliares para guiar a amostragem e realizar a triagem de amostras. O glifosato é o herbicida sistêmico não seletivo mais utilizado no mundo. Tal substância tem recebido crescente atenção, principalmente devido à sua ampla utilização e controvérsia em relação ao seu efeito potencialmente cancerígeno. Neste trabalho é apresentado um método para a detecção de glifosato diretamente em meio aquoso a partir da interrogação espectroscópica assistida por nanopartículas de prata. Com uso do espalhamento Raman, a região de assinatura espectral de moléculas em solução aquosa é acessível na região visível do espectro eletromagnético. Entretanto, o limite de deteção para este tipo de interrogação é prejudicado pela baixa intensidade do sinal ótico gerado. A intensificação do espalhamento Raman por um corpo metálico nanoestruturado é uma técnica que permite a detecção de traços de substâncias por meio de seu espectro vibracional. Nanopartículas esféricas de prata, com tamanhos de 5 a 20 nm, foram produzidas a partir da técnica de Ablação a Laser Pulsado em Líquidos resultando em uma solução coloidal estabilizada por íons de citrato, usado como surfactante. Um aparato experimental, composto por dois espectrofotômetros a fibra ótica e bombeamento por fontes de radiação laser e banda larga, foi implementado para interrogação das amostras de água com potencial presença de glifosato. O espectro vibracional foi obtido pela medição do espalhamento Raman intensificado em superfície (SERS) do conjunto de aglomerados de nanopartículas de prata formado pela agregação mediada pelo analito. Por meio do espectro de extinção UV-Vis, o estado de agregação das nanopartículas em solução coloidal foi medido. A partir dessa agregação, foi possível medir uma banda de espalhamento Raman intensificado dependente da concentração do analito. Um mecanismo baseado na interação entre o analito e o substrato foi proposto. A a partir dos resultados, realizou-se o ajuste na produção das nanopartículas, bem como sua interação com as amostras, permitindo a determinação do limite de detecção de 6,0 e 7,5 μM (1,0 e 1,3 ppm) para as duas técnicas de interrogação, UV-Vis e Raman, respectivamente. Um sistema de reconhecimento de padrões baseado no método da Análise de Discriminantes pelos Mínimos Quadrados Parciais (PLS-DA) foi implementado para a classificação de amostras. O sistema emprega a fusão em baixo nível dos dados espectroscópicos, UV-Vis e Raman, num único espaço de características. O sistema foi treinado e validado a partir de amostras de água deionizada e testado com amostras de água in natura com adição de glifosato. Considerando um limite de decisão de 10 μM, foi obtido um valor de acurácia de classificação de 0,85.
Water is a natural resource that, although abundant, has been under great limitation in its availability due to human activity, mainly agriculture. Ensuring compliance of the water that is distributed to the population on levels considered safe for the presence of contaminants is therefore a public health issue and has attracted great attention. In order to detect potentially harmful substances, complex analytical chemistry procedures are used to verify and issue conformity reports used for decision making regarding its potability. In this scenario there is a demand for auxiliary methods to guide sampling and to perform sample screening. Glyphosate is the most widely used non-selective systemic herbicide in the world. Such a substance has received increasing attention, mainly due to its wide use and controversy regarding its potentially carcinogenic effect. This work presents a method for the detection of glyphosate directly in aqueous medium from the spectroscopic interrogation assisted by silver nanoparticles. With the use of Raman scattering, the region of spectral signature of molecules in aqueous solution is accessible in the visible region of the electromagnetic spectrum. However, the detection limit for this type of interrogation is impaired by the low intensity of the optical signal generated. The enhancing of Raman scattering by a nanostructured metallic body is a technique that allows the detection of traces of substances by means of their vibrational spectrum. Silver spherical nanoparticles, ranging from 5 to 20 nm in diameter, were produced by Pulsed Laser Ablation in Liquid (PLAL) technique, resulting in a colloidal solution stabilized by citrate ions, used as a surfactant. An experimental apparatus composed of two optical fiber spectrophotometers, and pumping by laser and wideband radiation sources, was implemented to interrogate water samples with the potential presence of glyphosate. The vibrational spectrum was obtained by measuring the surface enhanced Raman scattering (SERS) of the silver nanoparticle clusters, formed by the analyte-mediated aggregation. By means of the UV-Vis extinction spectrum, the state of aggregation of the nanoparticles in colloidal solution was measured. From this aggregation, it was possible to measure one of the analyte concentration dependent enhanced Raman scattering band. A mechanism based on the interaction between the analyte and the substrate has been proposed. From the results, the tuning of the nanoparticles production, as well as their interaction with the samples was carried out. The limit of detection (LOD) of 6.0 and 7.5 μM (1.0 and 1.3 ppm) for the two interrogation techniques, UV-Vis and Raman, respectively, was achieved. A pattern recognition system based on the Partial Least Squares Discriminant Analysis (PLS-DA) method has been implemented for the classification of samples. The system employs the low level fusion of the spectroscopic data, UV-Vis and Raman, in a unique feature space. The system was trained and validated with deionized water samples and tested with fresh water samples with addition of glyphosate. Considering a decision limit of 10 μM, a classification accuracy of 0.85 was obtained.
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Orlov, Mikhail L. "Vibration-rotational studies of isotopic variants of diatomic molecules." Thesis, 1997. http://hdl.handle.net/1957/33855.

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Books on the topic "Raman spectra measurement"

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Groot, Wilhelmus A. de. The development of a fiber optic raman temperature measurement system for rocket flows. Cleveland, Ohio: Lewis Research Center, 1992.

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Brown, T. M. Multi-point measurement of temperature and species concentrations in opposed jet flames by UV Raman scattering. Washington, D.C: American Institute of Aeronautics and Astronautics, 1994.

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Singh, Upendra N. Development of eye-safe lidar for aerosol measurments. [College Park, MD]: UM Maryland, College Park Campus, Atmospheric Lidar Observatory, Institute for Physical Science and Technology, 1990.

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Singh, Upendra N. Development of eye-safe lidar for aerosol measurments. [College Park, MD]: UM Maryland, College Park Campus, Atmospheric Lidar Observatory, Institute for Physical Science and Technology, 1990.

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Singh, Upendra N. Development of eye-safe lidar for aerosol measurments. [College Park, MD]: UM Maryland, College Park Campus, Atmospheric Lidar Observatory, Institute for Physical Science and Technology, 1990.

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Gillespie, W. D. Raman scattering measurements of vibrational and rotational distributions in expanding nitrogen. Washington: American Institute of Aeronautics and Astronautics, 1993.

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Nandula, S. P. Multi-species line Raman measurements in H2-air turbulent flames. Washington, D.C: American Institute of Aeronautics and Astronautics, 1994.

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Skaggs, P. A. Multi-species measurements in CH4-air flames using a narrowband KrF excimer laser by UV Raman scattering. Washington, D.C: American Institute of Aeronautics and Astronautics, 1994.

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Shirinzadeh, B. Study of cluster formation and its effects on Rayleigh and Raman scattering measurements in a Mach 6 wind tunnel. Washington, D. C: American Institute of Aeronautics and Astronautics, 1991.

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Orlov, Mikhail L. Vibration-rotational studies of isotopic variants of diatomic molecules. 1997.

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Book chapters on the topic "Raman spectra measurement"

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Linnemann, U., P. Roosen, and H. J. Koß. "Evaluation of Noisy Coherent Anti-Stokes Raman Spectra by Evolutionary Algorithms." In Applied Optical Measurements, 381–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58496-1_24.

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Ansmann, Albert. "Molecular-Backscatter Lidar Profiling of the Volume-Scattering Coefficient in Cirrus." In Cirrus. Oxford University Press, 2002. http://dx.doi.org/10.1093/oso/9780195130720.003.0013.

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Backscatter and polarization lidars have already been used extensively to investigate ice clouds (see chapters 2 and 10). A severe limitation is that trustworthy values of the volume-scattering coefficient, one of the most important parameters in the description of the impact of cirrus on climate, cannot be derived from data taken with these lidars. Even the retrieved cirrus backscatter-coefficient profile is often questionable. A discussion of achievements and limitations of the lidar method can be found in the literature (e.g., Fernald et al. 1972; Klett 1981; Fernald 1984; Klett 1985; Sasano et al. 1985; Bissonnette 1986; Ansmann et al. 1992b; Kovalev 1995). The procedure, with all its subsequent modifications and improvements, suffers from the fact that two physical quantities, the particle backscatter coefficient and the particle extinction coefficient, must be determined from only one lidar signal. The uncertainties in the estimated optical parameters are especially large in cirrus, in which the relationship between particle extinction and backscattering can vary strongly in space and time. The situation improved significantly when the first molecular (Raman)-backscatter lidar experiments demonstrated that accurate extinction profiling throughout the entire troposphere is possible (Ansmann et al. 1990, 1992b). After the Pinatubo eruption, it was shown that even at stratospheric heights profiles of the volume-scattering coefficient can easily be obtained with a Raman lidar (Ansmann et al. 1991, 1993a, 1997; Ferrare et al. 1992; Gross et al. 1995; Donavan und Carswell 1997). Two types of molecular-backscatter lidars for extinction measurements are available. The Raman lidar measures lidar return signals elastically backscattered by air molecules and particles and inelastically (Raman) backscattered by nitrogen and/or oxygen molecules (Cooney et al. 1969; Melfi 1972; Ansmann et al. 1992a; Whiteman et al. 1992; Reichardt et al. 1996). Interference-filter polychromators and double-grating monochromators (Arshinov et al. 1983; Wandinger et al. 1998) are used to separate the aerosol signal from the vibrational-rotational or pure rotational Raman signals, to reduce the sky background radiation, and, for the Raman channels, to block the strong elastic-backscatter radiation at the laser wavelength. The suppression has to be better than 10-8. The second type of a molecular-backscatter lidar is the High Spectral Resolution Lidar (HSRL).
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Kumar, Rohit, Qiucheng Yu, Domenico Paparo, and Andrea Rubano. "TeraVision: A LabVIEW Software for THz Hyper-Raman Spectroscopy." In LabVIEW - A Flexible Environment for Modeling and Daily Laboratory Use. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96663.

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Terahertz Time-Domain Spectroscopy (TDS) has emerged during the last two decades as a very popular technique for characterizing the low-energy excitations of several materials, gaseous, liquids and solids, as well as artificial materials as for instance epitaxial heterostructures and more. In recent years, the advances in THz technology allowed obtaining nonlinear optical effects with THz photons, showing remarkable results. In particular, THz Hyper-Raman Spectroscopy greatly expands the spectroscopic capability of the standard THz-TDS by combining intense and broadband THz pulses with a detailed analysis of the spectral content of the generated signal. It is evident that this improvement needs an adequate software support. The main parameter for coding the software which differs with respect to a standard THz-TDS software is the control of a motorized grating (monochromator), but several routines employed in the setup optimization stage rather than the actual measurement are needed as well. In this paper we present the TeraVision software, based on LabVIEW code, in order to highlight the solutions we adopted to tackle the main experimental challenges as well as to give a pleasant and user-friendly experience to expert users.
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Smith, Raymond C., and Bruce R. Marshall. "Raman Scattering and Optical Properties of Pure Water." In Ocean Optics. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195068436.003.0016.

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There are numerous observations of the spectral attenuation, absorption, and scattering of distilled water and seawater. Morel (1974) reviewed the literature with respect to the attenuation coefficient as a function of wavelength and published his seawater and distilled water scattering coefficients. Smith and Baker (1978b) critically reviewed measurements made by many investigators to estimate the relative accuracies in the published values for the total absorption coefficient and the diffuse attenuation coefficient, and found a large range. Early workers frequently did not make a careful distinction between the absorption coefficient, the diffuse attenuation coefficient, and the total beam attenuation coefficient. Preisendorfer (1976) derived a set of inequalities linking the total beam attenuation coefficient, the diffuse attenuation coefficient, the forward scattering coefficient, the average cosine, the backscattering coefficient, and the absorption coefficient. This treatment allows us to define the theoretical bounds for the inherent and apparent optical properties of optically pure water. Morel (1974) defined optically pure water as a medium devoid of dissolved and suspended material. Thus, optically pure water is a medium for which particle backscattering, particle absorption, and the absorption due to dissolved organic material are zero, so the attenuation due to the water is the absorption due to water plus molecular scattering; that is, . . . cw = aw+bm (12.1) . . . Using the relationship (Preisendorfer, 1976) one can derive an inequality for the fresh water diffuse attenuation coefficient, establishing the following limitation (in the absence of transpectral scattering): where one-half the molecular scattering is included since molecular scattering is isotropic.
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Conference papers on the topic "Raman spectra measurement"

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Demers, Jennifer-Lynn, Scott Davis, Brian W. Pogue, and Michael D. Morris. "Measurement of Raman Spectra for Tomographic Reconstruction." In Biomedical Optics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/biomed.2012.bsu5a.8.

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Ohara, Shinobu, Takashi Oketani, Masamori Endo, Shigeru Yamaguchi, Kenzo Nanri, and Tomoo Fujioka. "Simultaneous Raman spectra measurement using power build-up cavity (PBC)." In Symposium on Integrated Optoelectronic Devices, edited by Aland K. Chin, Niloy K. Dutta, Robert W. Herrick, Kurt J. Linden, and Daniel J. McGraw. SPIE, 2002. http://dx.doi.org/10.1117/12.462655.

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Gan, Yu-Lin, and Li Wang. "Analysis of Raman spectra of GeAsSe glass using different peak-fitting method." In International Symposium on Precision Engineering Measurement and Instrumentation, edited by Junning Cui, Jiubin Tan, and Xianfang Wen. SPIE, 2015. http://dx.doi.org/10.1117/12.2180846.

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Liu, Li-na, Yin-chao Zhang, Si-ying Chen, He Chen, Pan Guo, and Yuan Wang. "The research of Raman spectra measurement system based on tiled-grating monochromator." In ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, edited by Farzin Amzajerdian, Astrid Aksnes, Weibiao Chen, Chunqing Gao, Yongchao Zheng, and Cheng Wang. SPIE, 2013. http://dx.doi.org/10.1117/12.2034934.

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Xiaoying Li, P. L. Voss, Jun Chen, Kim Fook Lee, and P. Kumar. "Measurement of co- and cross-polarized Raman spectra in silica fiber for small detunings." In 2005 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2005. http://dx.doi.org/10.1109/cleo.2005.202199.

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Kitagawa, Teizo, and Takashi Ogura. "Resonance Raman spectra of transient species of a respiration enzyme detected with an artificial cardiovascular system and Raman/absorption simultaneous measurement system." In Moscow - DL tentative, edited by Sergei A. Akhmanov and Marina Y. Poroshina. SPIE, 1991. http://dx.doi.org/10.1117/12.57308.

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Yanagisawa, M., M. Kunimoto, and T. Homma. "HAMR Emulation on Carbon Overcoat and Lubricant for Near Field Transducer and Magnetic Media Using Surface-Enhanced Raman Sensors." In ASME 2017 Conference on Information Storage and Processing Systems collocated with the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/isps2017-5431.

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A plasmonic sensor is used for emulation of near field transducer (NFT). Some overcoat films (thickness of 1nm) were coated on Au nanoparticles (NPs) on a convex quartz glass substrate (plasmonic sensor). Heating behavior of the films was examined by laser heating using novel Raman spectroscopic tools, i.e. surface-enhanced Raman scattering (SERS) with the plasmonic sensor, a continuous laser heating tool, in-situ observation of spectra and temperature with a high speed time-resolved measurement. The heating temperature of tetrahedral carbon (ta-C) film in He gas is lower than that in air. This is because the thermal conductivity of He is larger than air. Few spectral change of ta-C film (thickness of 1nm) on Au NP’s is observed except initial change in around 100 s at the temperature around 500 °C, which corresponds to the temperature of the carbon overcoat (COC) for the media temperature of 327 °C (600K, Currie temperature for CoPt alloy). Some carbide films, i.e. SiC, TiC, and WC, showed high heat resistance, that is, few spectral change was observed. It is found that lubricant is evaporated from the COC on magnetic media and transferred to the plasmonic sensor.
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Eto, Shuzo, Yuji Ichikawa, Masakazu Ogita, and Ippei Asahi. "Design of light receiver system for measurement of resonance Raman spectra in deep ultraviolet wavelength region." In Electro-Optical Remote Sensing XIII, edited by Gary W. Kamerman and Ove Steinvall. SPIE, 2019. http://dx.doi.org/10.1117/12.2532521.

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9

Knauer, Oliver S., Andreas Braeuer, Matthias C. Lang, and Alfred Leipertz. "Measurement of Concentration and Temperature Gradients at Binary Mixture Boiling Bubbles." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22054.

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Due to the high heat flux available, nucleate boiling is one of the most utilized processes for the transfer of large amounts of heat in chemical or power engineering applications. Nevertheless, the basic physical phenomena of this kind of heat transfer are physically not well understood, especially for multi-component mixtures in which the heat transfer coefficient is a function of the mixture composition. To apprehend the binary mixture boiling phenomena, the knowledge of the composition and temperature field surrounding a boiling bubble near the heater surface is of great impact. These quantities are measured at individual boiling bubbles by means of laser-optical methods without disturbing the system and with high spatial resolution. An optical accessible and temperature adjustable boiling chamber for the generation of single bubbles of acetone-isopropanol mixtures was constructed. As the vapor-liquid equilibriums (VLE) of these mixtures show a large gap between the saturated liquid and vapor line, significant composition alterations occur during the phase transition. Concentration and temperature gradients have been measured along a line by linear Raman spectroscopy. Due to the species specific Raman shift and the linear superposition of the inelastic scattered light intensities, qualitative and quantitative composition information can be achieved. In alcohols, e.g. isopropanol, the molecules can develop hydrogen bonds, which have an impact on the shape of the O-H bind signal in the Raman spectrum. As the ratio of molecules with and without hydrogen bonds changes with temperature, the temperature of the liquid phase can be derived from the spectra as well. The results show an enhancement of isopropanol, the less volatile component, near the phase boundary due to preferential evaporation of acetone. Furthermore, a not expected depletion of isopropanol approximately 0.75 mm away from the bubble was measured. The detected temperature increases near the boiling bubble, indicating a heat transfer from the gas phase to the surrounding liquid. The temperature distribution also has a minimum at the same position as the isopropanol distribution. A species conservation calculation with simplified assumptions was carried out and validated the measured composition distribution in the liquid surrounding a boiling bubble.
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Tedder, Sarah A., Dennis J. L. Siedlak, Steven G. Carter, and Daniel S. ReMine. "Development of Fuel Droplet Vaporization Rate Measurement Techniques for Realistic Burning Spray Applications." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94738.

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Technology to support design for the next generation of aircraft fuel injectors is being developed by NASA’s Fundamental Aeronautics Program to reduce emissions, increase efficiency, and enable fuel flexible aircraft. The design of these fuel injectors can be aided by measuring the vaporization rates of jet fuel droplets in realistic, burning sprays. Currently, in this environment, no instantaneous vaporization rate measurement techniques have been applied. After surveying techniques for potential development for this application, two techniques were identified: stimulated Raman scattering (SRS) and droplet lasing spectroscopy (DLS). Plans were developed for the modification of these techniques for this specific application. Developments of the SRS technique were tested including measurement of a water droplet diameter change rate. SRS spectra were also collected from jet fuel droplets.
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Reports on the topic "Raman spectra measurement"

1

Carey, D. Measurement of the Raman Spectrum of Liquid Water. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/767069.

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Ferrare, Richard A., Tyler Thorsen, Marian Clayton, Detlef Muller, Eduard Chemyakin, Sharon Burton, John Goldsmith, et al. Vertically Resolved Retrievals of Aerosol Concentrations and Effective Radii from the DOE Combined HSRL and Raman lidar Measurement Study (CHARMS) Merged High-Spectral-Resolution Lidar-Raman Lidar Data Set. Office of Scientific and Technical Information (OSTI), January 2017. http://dx.doi.org/10.2172/1413741.

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