The paper is to introduce the principles of vector optical heterodyning and active elastic scattering for principally new remote laser vibration testing systems. This approach comes from a new adjoining coherent method of elastic light scattering, which was earlier experimentally provided for the specific small-size experiments of dynamics light scattering. The theory of vector optical heterodyning for remote laser testing is presented. The method is available within the technique for coherent signal processing by beating several scattered vector waves within a square-low photo-detector by their registration. While the classical passive methods of optical beating deals with the problem to study a scalar optical signal due to elastic scattering with a Doppler shift and a single narrow-band laser beam, the new method deals with two vector waves simultaneously undergo simultaneous scattering by a remote vibrating object. In the case of one the vector waves (heterodyne) has strong periodical modulation of direction of polarization, Coherent Light Beating Scattering (CLBS) occurs, which unites elastic Light Scattering and Coherent non-linear Beating (mixing) within the square-low photo-detector. As a result, the vector optical signal provides the information about both vibrating spectrum and surface profile of a remote scattering object, which is not available for well-known Doppler methods with scalar optical heterodyning.
The paper is to introduce the principles of vector optical heterodyning principally enable for new aerospace sensor systems. This approach comes form a new adjoining coherent method of elastic light scattering, which was earlier experimentally provided for the specific small-size experiments of dynamics light scattering. The theory of vector optical heterodyning for remote sizing and velocimetry is presented. The method is available to advance within the technique for coherent signal processing, which appears to be available by beating several scattered vector waves within a square-low photo-detector by their registration. While the classical passive methods of optical beating deals with the problem to study a scalar optical signal that is due to elastic scattering with a Doppler shift and a single narrow-band laser beam, the new method deals with two vector waves simultaneously undergo scattering by a target. In case one of the vector waves has strong periodical modulation of direction of polarization. Coherent Light Beating Scattering occurs, which units elastic Light Scattering and Coherent non-linear Beating within the square-low photo-detector. As a result, the vector optical signal provides the information about both size and velocity of a remote scattering object, which is not available for well-known Doppler methods with scalar optical heterodyning.
An introduction into the elements of diffraction theory of coherent scattering of vector waves for size and velocity measurements is proposed to discuss. In traditional approach, a square-law detector is to observe beating in optical signal consists of two components: scattered and not-scattered scalar waves. The basis of proposed metrology is beating of two scattered coherent vector waves with variable states of their vectors of polarization (Coherent Light Beating Scattering (CLBS)) on a photodetector. Vectorial optical signal of CLBS is considered in framework of Fraunhofer diffraction of two plane vector waves by a single particle in case of periodical modulation of vector of polarization described as Jones vector. The formalism of Jones matrix is proposed to describe CLBS by a distribution of particles to control their sizes and velocities. A portable CLBS-spectrometer for size and motility application in biology is described. In traditional spectroscopy of optical beating, a particle alone provides with one scattered component of scalar wave to mix with a narrow-band reference wave on a square-law photodetector. As a result, a community of particles in motion gives fluctuation of intensity available for next spectral analysis of electrical signal. On the contrast, by CLBS, a single particle is to form two vectorial scattered coherent components to beat on a photodetector that joints beating and scattering as the basis for the new active control of a distribution of particles with the principal possibility of simultaneous k- spectroscopy of sizes and (omega) -spectroscopy of velocities. The CLBS-spectrum of alive Dunaliella is presented as a first example to develop a new optical standard to measure bioactivity.
An introduction to elements of diffraction theory of coherent scattering of vector waves for size & velocity measurements is proposed to discuss. In traditional approach, a square-law detection is to observe beating (fluctuation) in optical signal consists of two components: scattered and not-scattered scalar waves. The basis of proposed analysis is to consider mixing on a photodetector of two coherent vector waves with variable states of their vectors of polarization. Vectorial optical signal for spectral analysis is considered in framework of Fraunhofer diffraction for scattering of two plane vector waves by a single particle in case of periodical modulation of an angle of vector polarization described by Jones vector. The formalism of Jones matrix is proposed to describe coherent scattering by a distribution of particles to control their sizes and velocities. A portable spectrometer for Coherent Light Beating Spectroscopy (CLBS) for size & motility application in biology is described.
An introduction into the elements of diffraction theory of coherent scattering of vector waves for size and velocity measurements is proposed to discuss. In traditional approach, a square-law detection is to observe beating in optical signal consists of two components: scattered coherent vector waves with variable states of their vectors of polarization (coherent light beating scattering-CLBS). Vectorial optical signal of CLBS is considered in framework of Fraunhofer diffraction of two plane vector waves by a single particle in case of periodical modulation of vector of polarization described as Jones vector. The formalism of Jones matrix is proposed to describe CLBS by a distribution of particles to control their sizes and velocities. A portable CLBS-spectrometer for size and motility application in biology is described. In traditional spectroscopy of optical beating, a particle alone provides with one scattered component of scalar wave to mix with a narrow-band reference wave on a square-law photodetector. As a result, a community of particles in motion givers fluctuation of intensity available to next spectral analysis of electrical signal. By CLBS, in contrast, a single particle is to form two vectorial scattered coherent components to beat on photodetector that joints beating and scattering as the basis of a new active control of a distribution of particles with possibility of simultaneous k-spectroscopy of sizes and w-spectroscopy of velocities. The preliminary experimental results on control of several types of plankton and sperm are discussed in scope of using CLBS as a new optical standard to measure of bioactivity.
Experiments investigating thermocavitation in binary solutions induced by continuous laser radiation are described. The cavitation consists in periodic rise and collapse of vapor-gas bubbles, accompanied by hydraulic shocks. The necessary condition for obtaining periodic pressure pulses by thermocavitation are investigated and the influence of the volatile component in binary solutions on the magnitude of acoustic signal is studied. Regime of cw and pulse-laser excitation of cavitation is compared.
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