Journal of Quantitative Spectroscopy & Radiative Transfer最新文献

{"title":"Effects of oceanic turbulence on a multi-cosine-Lorentz correlated beam","authors":"Peiying Zhu,&nbsp;Dajun Liu,&nbsp;Yan Yin,&nbsp;Haiyang Zhong,&nbsp;Yaochuan Wang,&nbsp;Guiqiu Wang","doi":"10.1016/j.jqsrt.2024.109313","DOIUrl":"10.1016/j.jqsrt.2024.109313","url":null,"abstract":"<div><div>The model of a special beam array called multi-cosine-Lorentz correlated (MCLC) beam is introduced, and the coherence function of a MCLC source is related to the multi-cosine function and Lorentz function. The expressions of a MCLC beam in anisotropic oceanic turbulence are derived. Based on the obtained equations, the intensity shapes of a MCLC beam with small δ will become a beam array composed of Lorentz beamlets quickly. The beamlets of a MCLC beam in anisotropic oceanic turbulence can overlap and the shape of a MCLC beam can become a spot pattern, and the speed of overlap phenomenon can be accelerated on the stronger oceanic turbulence. The array pattern of a MCLC beam can be modulated by adjusting source parameters and oceanic turbulence. The results show a new method to provide a beam array composed of Lorentz beamlets.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109313"},"PeriodicalIF":2.3,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Combined stochastic and transfer model for atmospheric radiation” [Journal of Quantitative Spectroscopy and Radiative Transfer 73 (2002) 249–259]","authors":"S.B. Beale","doi":"10.1016/j.jqsrt.2024.109293","DOIUrl":"10.1016/j.jqsrt.2024.109293","url":null,"abstract":"","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109293"},"PeriodicalIF":2.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"Knut Stamnes","doi":"10.1016/j.jqsrt.2024.109291","DOIUrl":"10.1016/j.jqsrt.2024.109291","url":null,"abstract":"","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109291"},"PeriodicalIF":2.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrostatic boundary problems and T-matrix for the dielectric half-spheroid","authors":"Matt Majic ,&nbsp;Johan C.-E. Stén","doi":"10.1016/j.jqsrt.2024.109289","DOIUrl":"10.1016/j.jqsrt.2024.109289","url":null,"abstract":"<div><div>We solve the electrostatic boundary problems of a dielectric or conducting hemispheroid (half-spheroid) under arbitrary excitation. The solutions are obtained by expanding the potentials as series of spheroidal harmonics, and integrating over the boundary to obtain matrix equations which can be used to solve for the coefficients. The solutions are used to derive the capacity, polarizability and spatial fields. We simplify the results to that for a hemisphere, which for specific excitation fields agrees with the literature. We make a link to the T-matrix method, and present analytic expressions for the T-matrix and auxiliary Q and P matrices in the electrostatic limit. We show that the standard T-matrix approach of the extended boundary condition method (EBCM) cannot be used for this geometry, and that the P and Q-matrices do not match the EBCM form.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109289"},"PeriodicalIF":2.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on underwater polarization distribution reconstruction method for partial occlusion environment","authors":"Ying Ma ,&nbsp;Fang Kong ,&nbsp;Yinjing Guo ,&nbsp;Yaohuang Ruan ,&nbsp;Chunxiao Du ,&nbsp;Xiaohan Guo ,&nbsp;Di Zhang","doi":"10.1016/j.jqsrt.2024.109288","DOIUrl":"10.1016/j.jqsrt.2024.109288","url":null,"abstract":"<div><div>Underwater polarization imaging technology has important application prospects in marine scientific research, seabed resource exploration, seabed topography drawing, underwater archaeology and other fields. However, underwater polarization images are subject to degradation in image quality during the acquisition process due to occlusion by water grass, fish, and the absorption of water particles in the ocean. In order to enhance the quality of polarization images and restore distorted information, In this paper, an underwater rotating polarization imaging detection system is designed, which can capture sky polarized light about 10 m in the ocean. At the same time, an image reconstruction algorithm based on intra-frame prediction is proposed. The algorithm utilizes the temporal and spatial correlations of the angle of polarization image sequence to reconstruct distorted the angle of polarization images by predicting the current frame. Specifically, the proposed algorithm uses the surrounding information to predict the angle of polarization image of the occlusion area, and optimizes it through SATD (Sum of Absolute Transformed Differences) to obtain a better prediction residual image. Finally, the prediction residual image is combined with the prediction results to obtain the final reconstructed the angle of polarization image to achieve the purpose of navigation. Simulation and experimental results show that the proposed algorithm can adapt to partially occluded visual field environment, remove random occlusion and restore image detail information. Compared with the image before repair, the image information after repair is improved by about 65 %.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"333 ","pages":"Article 109288"},"PeriodicalIF":2.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On radial quadrature method applied to spherical wave expansion of Gaussian beams","authors":"Siqi Tang ,&nbsp;Jianqi Shen ,&nbsp;Gérard Gouesbet ,&nbsp;Leonardo A. Ambrosio","doi":"10.1016/j.jqsrt.2024.109290","DOIUrl":"10.1016/j.jqsrt.2024.109290","url":null,"abstract":"<div><div>The radial quadrature method is proposed recently for evaluating the beam shape coefficients (BSCs) of shaped beams, in which the BSCs are expressed in terms of integrals, infinite series and finite series as well. Previous study reveals that the BSCs expressed in finite series agree exactly with those obtained in the finite series technique and show blowing-ups for high-order partial waves, while the BSCs expressed in infinite series do not blow up. The paper presented here uncovers the reason behind these phenomena. It is found that the radial quadrature suppresses significantly the evanescent waves in the BSC evaluation.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109290"},"PeriodicalIF":2.3,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical properties of semi-transparent sensor covers determined from their spectral intensity distribution function","authors":"Miroslav Kocifaj ,&nbsp;Tomáš Novák ,&nbsp;Igor Medveď","doi":"10.1016/j.jqsrt.2024.109292","DOIUrl":"10.1016/j.jqsrt.2024.109292","url":null,"abstract":"<div><div>The optical properties of semi-transparent components used as multifunctional coatings or in various non-imaging devices are not always completely known a priori. The quality of plastic covers used in night sky brightness monitors, such as Sky Quality Meter (SQM), can deteriorate with age, causing initially transparent windows to become semi-transparent media that absorb and scatter light. We demonstrate here that the asymmetry parameter, single-scattering albedo, and volume extinction coefficient of such a diffusing optical element can be determined by measuring the light escaping from its outer interface.</div><div>Here we develop a simple model that allows for retrieval of the above parameters and can be applied to characterize various semi-transparent materials. The method is demonstrated for a particle-doped polycarbonate and Poly(methyl methacrylate) flat-plates of different thicknesses illuminated by a white light source. The spectral intensity of transmitted radiation is analyzed at discrete scattering angles for two samples of nearly the same optical properties except for the scattering asymmetry parameter. The samples sharing a number of similarities provide an ideal tool to test the method, because the angular structure of the scattered light can be interpreted in terms of a single optical parameter (while holding all other factors equal or nearly equal).</div><div>The method is useful for the optical diagnosis of covers on non-imaging devices as they age (e.g., SQMs). The optical properties of a plastic cover obtained from its measured spectral intensity distribution function are needed to interpret and correct the data gathered by still non-retired night sky scanners. Additionally, the method can assist in selecting the optimal optical covers for solar and other applications.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109292"},"PeriodicalIF":2.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematic investigations of the hyperfine structure constants of Niobium I levels. Part IV: New results derived from Fourier-transform spectra, including the discovery of four new levels","authors":"L. Windholz ,&nbsp;S. Kröger","doi":"10.1016/j.jqsrt.2024.109285","DOIUrl":"10.1016/j.jqsrt.2024.109285","url":null,"abstract":"<div><div>A determination of the hyperfine structure constants of high lying energy levels of the Niobium (Nb) atom was performed using Fourier-transform spectra. The results obtained complete previous investigations using mainly laser spectroscopy [JQSRT (2020) 245, 106871, 106872, 106873]. In the present work, the hf constants <em>A</em> of altogether 144 levels could be determined, among them 55 levels for which these constants are reported for the first time. Now for nearly all known energy levels of atomic Nb the hyperfine constants <em>A</em> are available. Further the discovery of four previously unknown energy levels is reported.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109285"},"PeriodicalIF":2.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and demonstration of a two-color nitric oxide vibrational temperature diagnostic using spectrally-resolved ultraviolet laser absorption","authors":"Spencer C. Barnes ,&nbsp;Jesse W. Streicher ,&nbsp;Ajay Krish,&nbsp;Ronald K. Hanson","doi":"10.1016/j.jqsrt.2024.109275","DOIUrl":"10.1016/j.jqsrt.2024.109275","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Development of a new ultraviolet (UV) laser absorption diagnostic has enabled the probing of nitric oxide (NO) in the second excited vibrational state (v” = 2) for inferences of quantum-state-specific number density and vibrational temperature time-histories. Spectroscopic modeling informed the selection of the new 246.3222 nm wavelength, as this wavelength exhibits high sensitivity for thermometry in the 2000 – 8000 K temperature range. This 246.3222 nm absorption feature consists of contributions from the &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;12&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;24&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;11&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;15&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;22&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;24&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;21&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;15&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; transitions all originating in the v” = 2 state. Absorption cross-sections at this selected wavelength were measured in reflected shock experiments for sweeps of both wavelength and temperature. The wavelength sweep investigated cross-sections over a 246.3202 – 246.3246 nm range at 4590 K, and the temperature sweep measured cross-sections over a 2500 – 7500 K range at the peak of the absorption feature (246.3222 nm). Cross-section results agree with the Stanford NO gamma-band model to within &lt;span&gt;&lt;math&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;5%, confirming the use of the model for subsequent thermometry studies. Thermometry was demonstrated in reflected shock experiments probing the vibrational relaxation and chemical reactions in 2% NO diluted in either argon (Ar) or nitrogen (N&lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;). These experiments leverage previous UV laser absorption diagnostics that probe NO in the ground vibrational state (v” = 0) using the R&lt;sub&gt;11&lt;/sub&gt;(26.5), R&lt;sub&gt;12&lt;/sub&gt;(34.5), Q&lt;sub&gt;21&lt;/sub&gt;(26.5) , and Q&lt;sub&gt;22&lt;/sub&gt;(34.5) transitions near 224.8155 nm and the Q&lt;sub&gt;11&lt;/sub&gt;(12.5) , R&lt;sub&gt;12&lt;/sub&gt;(19.5) , P&lt;sub&gt;21&lt;/sub&gt;(12.5) , and Q&lt;sub&gt;22&lt;/sub&gt;(19.5) transitions near 226.1026 nm, which were studied in Ref. &lt;span&gt;&lt;span&gt;[1]&lt;/span&gt;&lt;/span&gt;. The combination of the new diagnostic wavelength with previously validated diagnostics yields low-uncertainty vibrational temperature time-histories that are in excellent agreement with previously inferred vibrational relaxation time results from Refs. &lt;span&gt;&lt;span&gt;[2]&lt;/span&gt;&lt;/span&gt; and &lt;span&gt;&lt;span&gt;[3]&lt;/span&gt;&lt;/span&gt;. Future work will apply this two-color nitric oxide vibrational temperature diagnostic to probe the vibrational temperature of NO formed in high-temperature, shock-heated air at conditions relevant to","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109275"},"PeriodicalIF":2.3,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of photoplasma for creating EMF in slab cell one-sided irradiated by uniform radiation","authors":"Sergey A. Astashkevich ,&nbsp;Anatoly A. Kudryavtsev","doi":"10.1016/j.jqsrt.2024.109287","DOIUrl":"10.1016/j.jqsrt.2024.109287","url":null,"abstract":"<div><div>A modeling of the photoplasma in a slab cell filled with a sodium vapor and argon mixture one-sided irradiated by a uniform radiation flux was carried out. This study was performed for a spatially heterogeneous distribution of the resonance level density, unlike our previous works. An analytical form of this distribution for the slab available in the literature was used. The present investigation was performed at the sodium vapor pressure <em>P</em>_Na=0.005−0.3 torr and the ratio of argon and sodium pressures <em>P</em>_Ar/<em>P</em>_Na=10² for the spectral flux density <em>F</em>=5⋅10²−5.2⋅10⁴ Wm⁻²nm⁻¹. A set of plasma chemical reactions, radiation transfer and charge transport were considered. The spatial profiles of densities of the sodium atomic levels, atomic and diatomic ions, the electron density and temperature, and the electric potential in the volume of the cell were obtained from a self-consistent solution of the balance equations for densities of plasma components and the electron energy. It was established that spatial picture of the Na⁺ and Na₂⁺ ion density fractions depends significantly on the cell conditions. Parameters of wall sheaths were calculated used formulas from the literature. Used these data and the obtained spatial profiles of electric potential, the dependencies of electromotive force (the potential difference between the illuminated and dark walls of the cell) on the sodium pressure and incidental spectral flux density were obtained. The maximal EMF value was 1.5 V for the <em>P</em>_Na=0.05 torr and <em>F</em>=5.2⋅10⁴ Wm⁻²nm⁻¹. Obtained results can be used in the development of photo-electric converters.</div></div>","PeriodicalId":16935,"journal":{"name":"Journal of Quantitative Spectroscopy & Radiative Transfer","volume":"332 ","pages":"Article 109287"},"PeriodicalIF":2.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}