Physics of Wave Phenomena最新文献_第6页

Transition from Regular to Mach Reflection of Shock Waves in Laterally Colliding Laser-Produced Plasmas 侧面碰撞激光产生的等离子体中冲击波从常规反射到马赫反射的转变

IF 1.1 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-12-28 DOI: 10.3103/S1541308X23060092

S. Shilpa, Pramod Gopinath

引用次数: 0

Physical Problems of Direction Finding in the Deep Sea 深海测向的物理问题

IF 1.1 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-12-28 DOI: 10.3103/S1541308X2306002X

S. P. Aksenov, G. N. Kuznetsov

{"title":"Physical Problems of Direction Finding in the Deep Sea","authors":"S. P. Aksenov, G. N. Kuznetsov","doi":"10.3103/S1541308X2306002X","DOIUrl":"10.3103/S1541308X2306002X","url":null,"abstract":"The methods of direction finding for an immobile point source have been analyzed to obtain initial data for constructing acoustic distance measuring and tomography algorithms as applied to the deep sea. It is found that, to obtain reliable bearing estimates in the near- and far-field acoustic illumination zones (NFAIZ and FFAIZ), both in summer and in winter, it is sufficient to use the values of effective phase velocity (EPV) or effective group velocity (EGV) of sound, which are close to the measured speed of sound in water. However, in the shadow zone (SZ) under summer conditions, the effective velocities differ significantly from the speed of sound in water, and their values depend on distance, complicating additionally the solution of this problem. Therefore, to estimate the EPV and EGV, one must have information about the distance to the source. It is shown that application of vertically oriented antennas makes it possible to estimate the distance in the SZ and calculate independently the EPV and EGV values for each distance, which is necessary for direction finding. Thus, under summer conditions, conventional signal direction finding is performed in acoustic illumination zones, whereas in the SZ, in the case of simultaneous application of horizontal and vertical antennas, one must previously determine the distance to the source for calculating the bearing. The shadow zone is abscent in winter; thus, to phase a horizontal antenna on almost all distances, one can use the average speed of sound in water, but the antenna range must be determined.","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 6","pages":"383 - 395"},"PeriodicalIF":1.1,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139051228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Evaluation of Cr2+ Ions Absorption Cross-Section in Zn1–xMnxSe Solid Solutions by Nonlinear Transmission Measurements 通过非线性透射测量评估 Zn1-xMnxSe 固溶体中 Cr2+ 离子的吸收截面

IF 1.1 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-12-28 DOI: 10.3103/S1541308X23060031

M. E. Doroshenko, K. A. Pierpoint, A. Říha, H. Jelínková

引用次数: 0

Underwater Lidar: Remote Sensing in Strongly Scattering Media 水下激光雷达：强散射介质中的遥感

IF 1.1 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-12-28 DOI: 10.3103/S1541308X23060080

S. M. Pershin, A. F. Bunkin, V. A. Zavozin, M. Ya. Grishin, V. S. Makarov, P. A. Titovets, M. O. Fedyuk

{"title":"Underwater Lidar: Remote Sensing in Strongly Scattering Media","authors":"S. M. Pershin, A. F. Bunkin, V. A. Zavozin, M. Ya. Grishin, V. S. Makarov, P. A. Titovets, M. O. Fedyuk","doi":"10.3103/S1541308X23060080","DOIUrl":"10.3103/S1541308X23060080","url":null,"abstract":"A lidar backscattering signal from an opaque target object, passed through a 9-m water layer with scattering meshes on the laser beam path, has been detected (for the first time, to the best of our knowledge) when sensing by pulses with eye-safe radiation energy density (~1 μJ/cm2). The new principle of laser sensing makes it possible to measure the position of meshes on the lidar path, in contrast to conventional laser rangefinders, which measure the distance to only the first target. The lidar has been developed based on a pulsed diode-pumped Nd3+:YAG laser (532 nm, 3 ns, 2 µJ/pulse, pulse repetition rate 4 kHz) and gated single-photon avalanche photodiode (SPAD) with a gain up to ~106, serving as a detector. The large gain of the detector and suppression of its noise by gating ensured a signal-to-noise ratio of ≈35 for the target signal, which provides an estimate of underwater sensing range up to 30 m, according to the 3σ detection criterion. Compact lidars based on diode lasers (~1 µJ/pulse) with a radiation wavelength (~450 nm) in the spectral range of minimum losses in water and the increase in the safety of manned and unmanned underwater vehicles at early detection of nets (invisible for sonars) by a lidar are discussed.","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 6","pages":"406 - 411"},"PeriodicalIF":1.1,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Effects of Electron Temperature on Ion-Acoustic Solitons and Double Layers in Nonextensive Plasmas 电子温度对非扩展等离子体中离子声孤子和双层的影响

IF 1.1 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-12-28 DOI: 10.3103/S1541308X23060043

M. M. Hatami

引用次数: 0

Manifestations of the Dicke Narrowing at Fast Recording of High-Resolution Absorption Spectra Using Frequency-Tunable Lasers 用频率可调谐激光器快速记录高分辨率吸收光谱时Dicke变窄的表现

IF 1.4 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-10-16 DOI: 10.3103/S1541308X23050060

V. V. Lagunov, V. N. Ochkin, A. I. Volkova

{"title":"Manifestations of the Dicke Narrowing at Fast Recording of High-Resolution Absorption Spectra Using Frequency-Tunable Lasers","authors":"V. V. Lagunov, V. N. Ochkin, A. I. Volkova","doi":"10.3103/S1541308X23050060","DOIUrl":"10.3103/S1541308X23050060","url":null,"abstract":"The possibility of performing quantitative absorption measurements of particle concentrations using frequency-tunable lasers is investigated. At fast frequency scanning, when the recording time of spectrum is shorter or comparable with its formation time, well-known time-dependent interference interactions between the radiation incident on an absorbing medium and the radiation induced in it are observed. Under these conditions steady-state absorption spectra are distorted, and the classical relations lying in the basis of absorption measurements are violated. The character of the distortions depends on the type and density of particles, their absorption state, the mechanisms of spectra formation, and the laser beam power and geometry. In this paper, we report the results of studying the manifestations of Doppler profile narrowing caused by the Dicke effect in time-dependent spectra and their influence on the results of measuring the concentrations of absorbing particles. It is shown that the static spectrum can be reconstructed and quantitative measurements by integrated absorption spectroscopy can be performed under these conditions.","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 5","pages":"312 - 319"},"PeriodicalIF":1.4,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Dust Acoustic Solitary Waves with Vortex-Like Ion Distribution in Two-Dimensional Spherical Geometry 二维球形几何中具有类涡离子分布的尘埃声孤立波

IF 1.4 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-10-16 DOI: 10.3103/S1541308X23050035

Rasool Barazandeh Kian, Mohammad Hossein Mahdieh

引用次数: 0

Airy–Gauss Beam in Optical Manipulation Problems 光学操纵问题中的Airy–Gauss光束

IF 1.4 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-10-16 DOI: 10.3103/S1541308X23050084

V. A. Makarov, V. M. Petnikova

引用次数: 0

Influence of Water Vapor on the Spatial Oscillations of the Average Electron Energy in Helium in a Constant Electric Field 水蒸气对氦在恒定电场中平均电子能量空间振荡的影响

IF 1.4 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-10-16 DOI: 10.3103/S1541308X23050023

N. A. Dyatko, I. V. Kochetov, V. N. Ochkin

引用次数: 0

A Novel Method for Measuring the Concentration of Liquids using Helical Long-Period Fiber Gratings 一种利用螺旋长周期光纤光栅测量液体浓度的新方法

IF 1.4 4区物理与天体物理

Physics of Wave Phenomena Pub Date : 2023-10-16 DOI: 10.3103/S1541308X23050102

Yong Tang, Qiuyue Ran, Yulong Lian, Yunfeng Bai

{"title":"A Novel Method for Measuring the Concentration of Liquids using Helical Long-Period Fiber Gratings","authors":"Yong Tang, Qiuyue Ran, Yulong Lian, Yunfeng Bai","doi":"10.3103/S1541308X23050102","DOIUrl":"10.3103/S1541308X23050102","url":null,"abstract":"This research involves a novel liquid concentration measurement of helical long-period fiber grating (H-LPFG) by dual-wavelength difference. The grating with a period of 782 μm is spirally processed via the commercial welding machine. The resonant peak appears around 1520 nm. Coupled mode theory is used to study the transmission strength as a function of liquid concentration. Theoretically, the transmission intensity depends only on the liquid concentration. Then, we experimentally researched the relationship between the transmission intensity and the concentration as a function of the wavelength at 1495 and 1518 nm. Transmission intensity at these two places is e-exponential with respect to the liquid concentration. Due to the transmission intensity measurement concentration is influenced by the fluctuation of the light source, since the fluctuation of the light source will affect the transmission intensity. Finally, a demodulation system for H-LPFG is proposed using only filters and light detector. This allows a new way to develop a high-precision, low-cost, high-potential liquid concentration sensor.","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 5","pages":"363 - 370"},"PeriodicalIF":1.4,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0