The main purpose of the bar code in the modern world is the unique identification of the product, service, or any of their
features, so personal and stationary barcode scanners so widely used.
One of the important parameters of bar code scanners is their reliability, accuracy of the barcode recognition, response
time and performance.
Nowadays, the most popular personal barcode scanners contain a mechanical part, which extremely impairs the
reliability indices. Group of SUAI engineers has proposed bar code scanner based on laser beam acoustic deflection
effect in crystals [RU patent No 156009 issued 4/16/2015]
Through the use of an acousto-optic deflector element in barcode scanner described by a group of engineers SUAI, it can
be implemented in the manual form factor, and the stationary form factor of a barcode scanner.
Being a wave electronic device, an acousto-optic element in the composition of the acousto-optic barcode scanner allows
you to clearly establish a mathematical link between the encoded function of the bar code with the accepted input
photodetector intensities function that allows you to speak about the great probability of a bar code clear definition.
This paper provides a description of the issued patent, the description of the principles of operation based on the
mathematical analysis, a description of the layout of the implemented scanner.
This research is conducted in order to design a spectral device for light sources power spectrum analysis. The spectral device should process radiation from sources, direct contact with radiation of which is either impossible or undesirable. Such sources include jet blast of an aircraft, optical radiation in metallurgy and textile industry. In proposed spectral device optical radiation is guided out of unfavorable environment via a piece of optical fiber with high dispersion. It is necessary for analysis to make samples of analyzed radiation as short pulses. Dispersion properties of such optical fiber cause spectral decomposition of input optical pulses. The faster time of group delay vary the stronger the spectral decomposition effect. This effect allows using optical fiber with high dispersion as a major element of proposed spectral device. Duration of sample must be much shorter than group delay time difference of a dispersive system. In the given frequency range this characteristic has to be linear. The frequency range is 400 … 500 THz for typical optical fiber. Using photonic-crystal fiber (PCF) gives much wider spectral range for analysis. In this paper we propose simulation of single pulse transmission through dispersive system with linear dispersion characteristic and quadratic-detected output responses accumulation. During simulation we propose studying influence of optical fiber dispersion characteristic angle on spectral measurement results. We also consider pulse duration and group delay time difference impact on output pulse shape and duration. Results show the most suitable dispersion characteristic that allow choosing the structure of PCF – major element of time-dispersion spectral analysis method and required number of samples for reliable assessment of measured spectrum.
This paper aims to inform those interested in the scientific work of a large group of scientists: workers of the
Department of Electronics and Optical communications of St. Petersburg State University of Aerospace
Instrumentation in collaboration with workers of the Department of Quantum Electronics of St. Petersburg State
Technical University in the area of researches and development of acousto-optic tunable filters (AOTF).
Paper discusses the important features of the AOTF structure and their parameters that affect its work, such as:
spectral range of optical radiation, spectral resolution, active aperture of the optical radiation, optical transmission
of the working spectral range, optical radiation polarization (linear, circular or arbitrary) , diffraction efficiency,
contrast, distortion of the optical radiation’s front, frequency range of elastic waves, switching time, maximum
electric control power, impedance.
Also the AOTF using is considered: AOTF’s implications for control of laser radiation, AOTF’s application to
determine the counterfeit money. The last part of the report focuses on materials that act as antireflection thin
films.
Spectral characteristics of "clean" and enlightened substrates of ZnSe and Ge are shown. As seen from the
examples in the report, antireflection thin films increase transmittance of optical elements.
The idea of acousto-optic self-tuning deflector, which automatically returns the position of the acoustic line,
corresponding to the mode of Bragg diffraction feedback implementation is proposed. Features of sodium
bismuthate’s double molybdate grown by new technology – low gradient Czochralski process are illustrated.
Acousto-optic device are used in various signal processing systems and laser radiation controlling systems. These systems allow the wideband signals processing in real-time and high-speed laser beam scanning.
In this paper, dependences of electromechanical coupling coefficient for different slices of a lithium niobate crystals are calculated. They illustrate the validity of selecting the appropriate cut for the piezoelectric transducer for the excitation of longitudinal waves and shear waves in acousto-optic cells.
Also, these dependences determine the criteria for the accuracy of the technological requirements for the piezoelectric plate transducers constructing.
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