Optical gyros operating using the phase characteristic of the ring confocal resonator

2018 ◽  
Author(s):  
Vladimir Yurievich Venediktov ◽  
Yurii Filatov ◽  
Egor Shalymov ◽  
Alina Gorelaya
Keyword(s):  
Phase Characteristic ◽  
Confocal Resonator

Phase characteristic of phase-only spatial light modulator under high-power laser irradiation

2021 ◽  
Author(s):  
Yu Takiguchi ◽  
Hiroshi Tanaka ◽  
Tsubasa Watanabe ◽  
Yoshiyuki Ohtake ◽  
Haruyoshi Toyoda
Keyword(s):  
Laser Irradiation ◽  
High Power ◽  
Spatial Light Modulator ◽  
Phase Characteristic ◽  
High Power Laser ◽  
Power Laser ◽  
Light Modulator

scholarly journals Multipass optical amplifier using a double confocal resonator geometry

1987 ◽  
Vol 22 (12) ◽  
pp. 1665-1671 ◽  
Author(s):  
R.L. Fork ◽  
F.A. Beisser ◽  
D.K. Fork
Keyword(s):  
Optical Amplifier ◽  
Confocal Resonator

scholarly journals Using Hilbert Transform in Diagnostic of Composite Materials by Impedance Method

2020 ◽  
Vol 64 (4) ◽  
pp. 334-342 ◽  
Author(s):  
Volodymyr Eremenko ◽  
Artur Zaporozhets ◽  
Vitalii Babak ◽  
Volodymyr Isaienko ◽  
Kateryna Babikova
Keyword(s):  
Composite Materials ◽  
Nondestructive Testing ◽  
Hilbert Transform ◽  
Instantaneous Frequency ◽  
Information Quality ◽  
Low Frequency ◽  
Mechanical Impedance ◽  
Phase Characteristic ◽  
Impedance Method ◽  
Materials Testing

The article is devoted to the problem of the increasing of information quality for the impedance method of nondestructive testing. The purpose of this article is to get for the pulsed impedance method of nondestructive testing the additional informative parameters. Instantaneous values of the information signal's amplitude is a sensitive parameter to the effects of interference, in particular friction, which necessitates the use of additional informative features. It was experimentally measured signals from defective and defectless areas of the test pattern. Using of the Hilbert transform gave possibility to determine phase characteristics of these signals and realize demodulation to extract a low-frequency envelope for further analysis of its shape. It was received the informative features as a result of researches. Among them are instantaneous frequency of a signal, the integral of a phase characteristic on the selected interval and the integral of a difference signal phase characteristics. In order to compare quality of the defect detection using selected parameters it was carried out evaluation of the testing result reliability for a product fragment made of a composite material. Considering the influence of the change in the mechanical impedance of the researched area on the phase-frequency characteristics of the output signal of the converter, it is proposed to use as the diagnostic signs: the instantaneous frequency and the value of the phase characteristic of the current signal for certain points in time. The proposed informative features enable to increase general reliability of composite materials testing by the pulsed impedance method.

Multiphysical simulation of a ring confocal resonator

2018 ◽  
Author(s):  
Vladimir Yurievich Venediktov ◽  
Yurii Filatov ◽  
Alexander Kukaev ◽  
Egor Shalymov
Keyword(s):  
Confocal Resonator

Estimation of permissible deviations of geometrical parameters of the ring confocal resonator

2019 ◽  
Author(s):  
Yuri Filatov ◽  
Alina Gorelaya ◽  
Daniil Larionov ◽  
Egor Shalymov ◽  
Dmitriy Venediktov ◽  
...  
Keyword(s):  
Geometrical Parameters ◽  
Confocal Resonator

Research on Soft Demodulation of Telemetry Signal in Reentry Telemetry Environment

2014 ◽  
Vol 543-547 ◽  
pp. 2555-2558
Author(s):  
Gang Fu ◽  
Dong Xu Zhu ◽  
Wen Jian Geng
Keyword(s):  
Phase Characteristic ◽  
Telemetry System ◽  
Test Results ◽  
Signal Phase ◽  
Signal Noise ◽  
Soft Demodulation ◽  
Synchronization Algorithm ◽  
Signal Demodulation ◽  
Demodulation Method ◽  
Target Spacecraft

PCM/FM system is one of the most widely used in the missile and rocket telemetry system. For the problem that the breakthrough tradition demodulation method of demodulation threshold leaded by the telemetry signals low signal noise ratio (SNR) of target spacecraft reentry telemetry environment, a baseband complex rotating orthogonal MSD based soft PCM/FM signal demodulation method is studied combined with the PCM/FM signal phase characteristic. The corresponding synchronization algorithm is applied to ensure the smooth operation of the demodulation. The simulation and test results verify the soft demodulation algorithm can make reduce the demodulation threshold effectively.

Multimode Resonators with a Small Fresnel Number (Lowest-Order Eigenmodes)

1965 ◽  
Vol 20 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Helmut K. V. Lotsch
Keyword(s):  
Imaginary Part ◽  
Traveling Wave ◽  
General Type ◽  
Wave Type ◽  
Fresnel Number ◽  
Fabry Perot ◽  
Diffracted Waves ◽  
Resonator System ◽  
The Waves ◽  
Confocal Resonator

The Fabry-Pèrot Interferometer, the confocal and the spherical resonator systems are investigated. The lowest-order traveling-wave type eigenmodes are calculated. Numerical values for the diffraction losses are given. The smallest diffraction losses are obtained for the general-type eigenmode of a confocal resonator system. The eigenfunctions of an open-walled resonator show a point of inflection as their characteristic feature. They are complex if the Fresnel Number is finite. When calculate over appropriate surfaces, their imaginary part, in the region close to the axis, decreases as F increases. In that region the waves resonate between the reflectors. Towards the rim of the system the imaginary part increases rapidly as do the diffracted waves associated with the imaginary part.

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