Active elastic scattering for remote laser vibration monitoring

Anatoly T. Sukhodolsky

doi:10.1117/12.468194

22 May 2002 Active elastic scattering for remote laser vibration monitoring

Anatoly T. Sukhodolsky

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468194
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

Abstract

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.

Citation Download Citation

Anatoly T. Sukhodolsky "Active elastic scattering for remote laser vibration monitoring", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468194

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KEYWORDS

Heterodyning

Laser scattering

Light scattering

Scattering

Polarization

Modulation

Active optics

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