Synthesis of multifrequency optical holograms of rotating objects

Bogdanova, T. V.; Titar, V. P.; Tomchuk, E.

doi:10.1134/1.1481150

Cited by 5 publications

(11 citation statements)

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“…Based on the analysis of the relations presented and results of numerical simulations we have concluded in papers [10,11] that optical holograms of rotating objects can be synthesized with a high resolution (I to 10 cm) during rotation of the object at a very small angle equal to AbP=10-5...10-4 rad. Therefor, optical holograms can be synthesized not only in the case of rotation objects, but when the object orientation with respect to any of the axes is changed slightly, including vibrations and weak oscillations.…”

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confidence: 98%

“…The resolution of multifrequency synthesized hologram of rotating object in the longitudinal direction is determined by the frequency bandwidth of the laser radiation and depends on the linear dimensions of the object, the initial laser-radiation frequency, and the object's rotating angle during the hologram synthesizing time [6,7]. 4.…”

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confidence: 99%

“…The degree of isoplanarity of a multifrequency system for synthesizing holograms of rotating objects, which is characterized by the degree of preservation of the pulse-response parameters, is several orders of magnitude higher than the degree of isoplanarity of a singlefrequency system. In the object-irradiation (longitudinal) direction, the shape of the pulse response is virtually independent of the change in the point-object position with a changing aspect angle; therefore, the multifrequency system can be considered isotropic in this direction [6,7].…”

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confidence: 99%

“…As a result of limitations of the frequency bandwidth and the object's rotating angle during the synthesizing time, the minimal value of the hologram resolution that can be obtained with this method is independent of the rotation angle and frequency bandwidth and depends on the object's dimensions, laser-radiation wavelength, and the object's angular position. Thus, the diffraction limit of this method is determined [6,7]. 5.…”

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confidence: 99%

“…The images restored from the multifrequency RF holograms are normally viewed within a projective plane [1], or separately for each of the illuminating frequencies within the picture plane [6]. Pasmurov [9] suggested treating the recorded RF hologram for each scattering center as a three-dimensional diffraction grating, and estimating the reflectivity position of each center through 3-D Fourier transformation of the data.…”

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Optical multifrequency complex holograms

Titar

Bogdanova²

Proceedings of CAOL 2005. Second International Conference on Advanced Optoelectronics and Lasers, 2005.

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A two-channel system for synthesizing two-dimensional optical multifrequency complex holograms of rotating objects was developed. In the object irradiation (longitudinal) direction, a hologram is synthesized due to multifrequency laser radiation, and in the transverse direction, the synthesis is provided by object rotation. The resolution of the synthesized hologram in the longitudinal direction is determined by the frequency bandwidth of the laser radiation, and in transverse direction, the resolution is determined by the initial laserradiation frequency and the angle of object rotation during the time of hologram synthesis. Using a digital simulation, the degree of isoplanarity of the multifrequency system for synthesizing holograms of rotating objects and its noise immunity under conditions of phase noises were analyzed.The known long-wave holography methods for measuring the parameters of rotating objects are based on the synthesis of holograms with the use of multifrequency coherent RF radiation illuminating the object [1] or using the Doppler change in the frequency when observing a rectilinearly moving and simultaneously rotating object [2], which is illuminated by pulse single-frequency coherent radiation. The data on the rotating object in the optical range can be obtained either by synthesizing holograms by scanning the object along angular coordinates with a laser beam [3] or receiving the laser radiation reflected by the object at several spatial points [4]. This makes it possible to obtain a three-dimensional (3-D) image and determine both the rotation frequency and the orientation ofthe rotating object.This work describes a multifrequency holographic system for synthesizing images of rotating object (Fig. 1), which uses a principle of synthesizing complex optical holograms with the help of combined receiving and transmitting point aperture. In the object irradiation (longitudinal) direction, a hologram is synthesized due to the presence of multiple frequencies in the laser radiation, and in the object's rotation determines the synthesizing of a hologram in the transverse direction. The resolution of the hologram in these directions is determined, respectively, by the laser-radiation frequency bandwidth and the angle through which the object rotates during the hologram synthesis time, being independent of the distance to the object. Using a digital simulation technique, we analyze the properties of 2-D optical multifrequency complex holograms of rotating objects synthesized on an aperture of (128x256) discrete elements, including the degree of isoplanarity of the system considered [5].Multifrequency holograms of rotating objects are, synthesized with the system considered to the following procedure. The radiation of the frequency-turned laser I is directed by a telescopic system, which is formed by the lenses 6 and 8, diaphragm 7, and semitransparent mirror 9, to the holographed object 10 rotating around the center of rotation 11 using the object control unit 12. The duration of each frequency-turned...

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confidence: 98%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Optical multifrequency complex holograms

Titar

Bogdanova²

Proceedings of CAOL 2005. Second International Conference on Advanced Optoelectronics and Lasers, 2005.

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Theory of Gas Discharge Plasma

Smirnov

2015

Springer Series on Atomic, Optical, and Plasma Physics

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The Springer Series on Atomic, Optical, and Plasma Physics covers in a comprehensive manner theory and experiment in the entire field of atoms and molecules and their interaction with electromagnetic radiation. Books in the series provide a rich source of new ideas and techniques with wide applications in fields such as chemistry, materials science, astrophysics, surface science, plasma technology, advanced optics, aeronomy, and engineering. Laser physics is a particular connecting theme that has provided much of the continuing impetus for new developments in the field, such as quantum computation and Bose-Einstein condensation. The purpose of the series is to cover the gap between standard undergraduate textbooks and the research literature with emphasis on the fundamental ideas, methods, techniques, and results in the field.More information about this series at

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An update of argon inelastic cross sections for plasma discharges

Yanguas‐Gil

Cotrino

Alves³

2005

J. Phys. D: Appl. Phys.

140

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This paper proposes a coherent set of electron impact inelastic cross sections for argon, based on recent experimental measurements. The updated set is validated by comparing calculated swarm parameters and rate coefficients (obtained by solving the two-term approximation electron Boltzmann equation) with available experimental data. This validation procedure is usually adopted when the cross section set is to be later used in plasma discharge modelling. Simulation results for the electron drift velocity and characteristic energy are in very good agreement with experimental values of these quantities. Calculations, using cross section sets proposed by different authors, of the total (direct + cascade) excitation coefficients to the 4s and 4p states, and of the Townsend ionization coefficient, show that the present set ensures the best overall agreement with measured values. The agreement is particularly good for the excitation coefficient to metastable 4s′[1/2]0 and the Townsend ionization coefficient, which are probably the most relevant electron macroscopic coefficients in the modelling of discharge plasmas.

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Synthesis of multifrequency optical holograms of rotating objects

Cited by 5 publications

References 3 publications

Optical multifrequency complex holograms

Optical multifrequency complex holograms

Theory of Gas Discharge Plasma

An update of argon inelastic cross sections for plasma discharges

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