The Experts below are selected from a list of 18720 Experts worldwide ranked by ideXlab platform
S. A. Pereselkov - One of the best experts on this subject based on the ideXlab platform.
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measurement capability of the Interferometric Method of sound source localization in the absence of data on the waveguide transfer function
Physics of Wave Phenomena, 2019Co-Authors: E S Kaznacheeva, G. N. Kuznetsov, V M Kuzkin, G A Lyakhov, S. A. PereselkovAbstract:The resolution of Interferometric Method of a sound source localization is analyzed. Two realizations of this Method are presented, which do not call for the knowledge of the propagation medium characteristics for determining the source coordinates. These realizations solve the problem of identifying a low-noise source in water areas where acoustic calibration cannot be performed. The maximum applicability range of the Method is estimated; this estimate makes it possible to optimize the source signal processing.
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Resolving Power of the Interferometric Method of Source Localization
Physics of Wave Phenomena, 2018Co-Authors: V. M. Kuz’kin, G. N. Kuznetsov, S. A. Pereselkov, V. A. Grigor’evAbstract:Results of a computer simulation of the resolution of three noise sources with different intensities against the background of isotropic noise in an oceanic waveguide are presented. A comparative analysis of the error in determining their coordinates (bearing, radial velocity, distance, depth) is performed. A computational experiment is implemented based on the Interferometric Method of source localization using vector-scalar receivers.
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An Interferometric Method for Detecting a Moving Sound Source with a Vector-Scalar Receiver
Acoustical Physics, 2018Co-Authors: I. V. Kaznacheev, V. M. Kuz’kin, G. N. Kuznetsov, S. A. PereselkovAbstract:The paper discusses the conditions imposed on the spectrum of an emitted signal for which the Interferometric Method of detecting a moving sound source in shallow water is applicable for vector-scalar receivers. It is shown that a normalized spectrogram representing a two-dimensional Fourier transform of the Interferometric pattern is identical for all four acoustic field components and combinations thereof. Results of a field experiment in which a vector-scalar receiver was applied are presented. The interference immunity of the Method is considered for different field components in the case of isotropic interference.
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Interferometric Method for estimating the velocity of a noise sound source and the distance to it in shallow water using a vector scalar receiver
Physics of Wave Phenomena, 2017Co-Authors: G. N. Kuznetsov, S. A. Pereselkov, I. V. Kaznacheev, V M Kuzkin, V A GrigorevAbstract:An experiment on estimating the velocity of a noise source and the distance to it using a single vector-scalar receiver has been performed on shallow-water Pacific shelf. Expressions for the components of the vector-scalar receiver field are derived. The source parameters are reconstructed using the Interferometric Method. The noise immunity of the Method is analyzed for different acoustic field components and their combinations. The sensitivity of the Method with respect to changes in the bottom parameters is considered.
Pablo Artal - One of the best experts on this subject based on the ideXlab platform.
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Interferometric Method for phase calibration in liquid crystal spatial light modulators using a self-generated diffraction-grating
Optics Express, 2016Co-Authors: José Luis Martínez Fuentes, Enrique J. Fernández, Pedro M. Prieto, Pablo ArtalAbstract:An auto-referenced Interferometric Method for calibrating phase modulation of parallel-aligned liquid crystal (PAL) spatial light modulators (SLM) is described. The Method is experimentally straightforward, robust, and requires solely of a collimated beam, with no need of additional optics. This Method uses the SLM itself to create a tilted plane wave and a reference wave which mutually interfere. These waves are codified by means of a binary diffraction grating and a uniformly distributed gray level area (piston) into the SLM surface. Phase shift for each gray level addressed to the piston section can then be evaluated. Phase modulation on the SLM can also be retrieved with the proposed Method over spatially resolved portions of the surface. Phase information obtained with this novel Method is compared to other well established calibration procedures, requiring extra elements and more elaborated optical set-ups. The results show a good agreement with previous Methods. The advantages of the new Method include high mechanical stability, faster performance, and a significantly easier practical implementation.
G. N. Kuznetsov - One of the best experts on this subject based on the ideXlab platform.
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measurement capability of the Interferometric Method of sound source localization in the absence of data on the waveguide transfer function
Physics of Wave Phenomena, 2019Co-Authors: E S Kaznacheeva, G. N. Kuznetsov, V M Kuzkin, G A Lyakhov, S. A. PereselkovAbstract:The resolution of Interferometric Method of a sound source localization is analyzed. Two realizations of this Method are presented, which do not call for the knowledge of the propagation medium characteristics for determining the source coordinates. These realizations solve the problem of identifying a low-noise source in water areas where acoustic calibration cannot be performed. The maximum applicability range of the Method is estimated; this estimate makes it possible to optimize the source signal processing.
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Resolving Power of the Interferometric Method of Source Localization
Physics of Wave Phenomena, 2018Co-Authors: V. M. Kuz’kin, G. N. Kuznetsov, S. A. Pereselkov, V. A. Grigor’evAbstract:Results of a computer simulation of the resolution of three noise sources with different intensities against the background of isotropic noise in an oceanic waveguide are presented. A comparative analysis of the error in determining their coordinates (bearing, radial velocity, distance, depth) is performed. A computational experiment is implemented based on the Interferometric Method of source localization using vector-scalar receivers.
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An Interferometric Method for Detecting a Moving Sound Source with a Vector-Scalar Receiver
Acoustical Physics, 2018Co-Authors: I. V. Kaznacheev, V. M. Kuz’kin, G. N. Kuznetsov, S. A. PereselkovAbstract:The paper discusses the conditions imposed on the spectrum of an emitted signal for which the Interferometric Method of detecting a moving sound source in shallow water is applicable for vector-scalar receivers. It is shown that a normalized spectrogram representing a two-dimensional Fourier transform of the Interferometric pattern is identical for all four acoustic field components and combinations thereof. Results of a field experiment in which a vector-scalar receiver was applied are presented. The interference immunity of the Method is considered for different field components in the case of isotropic interference.
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Interferometric Method for estimating the velocity of a noise sound source and the distance to it in shallow water using a vector scalar receiver
Physics of Wave Phenomena, 2017Co-Authors: G. N. Kuznetsov, S. A. Pereselkov, I. V. Kaznacheev, V M Kuzkin, V A GrigorevAbstract:An experiment on estimating the velocity of a noise source and the distance to it using a single vector-scalar receiver has been performed on shallow-water Pacific shelf. Expressions for the components of the vector-scalar receiver field are derived. The source parameters are reconstructed using the Interferometric Method. The noise immunity of the Method is analyzed for different acoustic field components and their combinations. The sensitivity of the Method with respect to changes in the bottom parameters is considered.
Qiang Chen - One of the best experts on this subject based on the ideXlab platform.
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Testing large aspheric surfaces with complementary annular subaperture Interferometric Method
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 2008Co-Authors: Xi Hou, Baiping Lei, Bin Fan, Qiang ChenAbstract:Annular subaperture Interferometric Method has provided an alternative solution to testing rotationally symmetric aspheric surfaces with low cost and flexibility. However, some new challenges, particularly in the motion and algorithm components, appear when applied to large aspheric surfaces with large departure in the practical engineering. Based on our previously reported annular subaperture reconstruction algorithm with Zernike annular polynomials and matrix Method, and the experimental results for an approximate 130-mm diameter and f/2 parabolic mirror, an experimental investigation by testing an approximate 302-mm diameter and f/1.7 parabolic mirror with the complementary annular subaperture Interferometric Method is presented. We have focused on full-aperture reconstruction accuracy, and discuss some error effects and limitations of testing larger aspheric surfaces with the annular subaperture Method. Some considerations about testing sector segment with complementary sector subapertures are provided.
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experimental study on measurement of aspheric surface shape with complementary annular subaperture Interferometric Method
Optics Express, 2007Co-Authors: Xi Hou, Li Yang, Qiang ChenAbstract:Based on our previously reported annular subaperture reconstruction algorithm with Zernike annular polynomials and matrix Method, we provide an experimental demonstration by testing a parabolic mirror with the complementary annular subaperture Interferometric Method. By comparing the results of annular subaperture Method with that of the classical auto-collimation Method, it is shown that the reconstruction results are in good agreement with the auto-collimation measurement. In addition, we discuss some limitations of characterizing annular subaperture measurement data with finite Zernike coefficients in our algorithm, and also show the possibility of characterizing higher spatial frequency information with adequate Zernike coefficients. It is believable that the reported Method can be extended to test the surface shape of some large concave aspheric mirrors with acceptable accuracy.
Sidney R Nagel - One of the best experts on this subject based on the ideXlab platform.
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determining the refractive index absolute thickness and local slope of a thin transparent film using multi wavelength and multi incident angle interference
Optics Express, 2020Co-Authors: Mengfei He, Sidney R NagelAbstract:We describe a high-speed Interferometric Method, using multiple angles of incidence and multiple wavelengths, to measure the absolute thickness, tilt, the local angle between the surfaces, and the refractive index of a fluctuating transparent wedge. The Method is well suited for biological, fluid and industrial applications.