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Method for detecting turbulence conditions, using the interaction of a laser beam with a thin photochromic film, and device for implementing said method

A photochromic and laser beam technology, applied in the direction of measuring devices, fluid velocity measurement, full-field flow measurement, etc., can solve problems such as difficult implementation

Inactive Publication Date: 2015-08-26
CENT NAT DE LA RECHERCHE SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In both cases, these methods are difficult to implement, since an interference must be made for the Doppler velocimeter or two amplitude gratings must be installed and their initial stability must be ensured for the Moiré technique
For wavefront tilt, the analysis is performed by using polynomial techniques based on analysis methods of type shark-hartmann (A.V.Sergryev et al., Appl.Opt., 50(20), 3519- 3528, (2011)), and requires complex and expensive systems for analyzing the wavefront of the laser

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  • Method for detecting turbulence conditions, using the interaction of a laser beam with a thin photochromic film, and device for implementing said method
  • Method for detecting turbulence conditions, using the interaction of a laser beam with a thin photochromic film, and device for implementing said method
  • Method for detecting turbulence conditions, using the interaction of a laser beam with a thin photochromic film, and device for implementing said method

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Embodiment Construction

[0063] The invention will be described in the context of azobenzene films, but other types of photochromic organic materials can equally well be used. The effect used in the present invention corresponds to holographic recording in which the fringes form themselves during the molecular self-organization process and gives a statistical average over the long-term influence of the turbulent medium on the laser propagation. Organic holographic materials have the advantage over their structurally polyvalent inorganic equivalents of being easy to prepare and inexpensive.

[0064] This type of photochromic material (such as an azo-based polymer material) is capable of self-organizing on a surface under the influence of a laser to produce a structuring in the form of a diffraction grating, enabling the simultaneous measurement of multiple features of the turbulent flow .

[0065] For the special optical properties of azobenzene molecules, the research on azobenzene molecules ha...

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Abstract

The invention relates to a method for assessing the turbulence parameters of a medium, characterized in that said method includes the following steps: illuminating, by means of a laser beam propagating in said medium, a film made of a photochromic organic material that may include azobenzene, spyropyrane, stylbene, coumarin, or fulgide molecules, said illumination creating a surface array in which the film comprises streaks having deformations based on turbulence parameters; acquiring images containing elementary areas of structures related to said streaks, more or less reduced and representative of the turbulence parameters of said medium; and processing said images to assess the turbulence parameters of said medium. The invention also relates to a device for implementing said method.

Description

technical field [0001] The field of the invention is a method enabling the detection of turbulences in a medium using the perturbations generated in the propagation of a laser beam, and a compact device for implementing this method. Background technique [0002] This type of method can also be used to measure the rate of turbulence (stronger or weaker in a given environment) and to measure the effect of turbulence on the propagation of the laser beam. [0003] Indeed, the analysis of turbulence via a compact and discrete device has many potential applications, especially in the environmental field, such as detecting temperature rise, air movement in towns and cities. [0004] It can also be very beneficial to measure variations in the propagation of the laser beam caused by ambient turbulence. The propagation of laser beams through turbulent media is of particular importance for applications such as optical communication in free space (sea, battlefield, etc.), detection of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/00G01P5/26G03H1/00
CPCG01P5/001G01P5/26G06T3/10
Inventor R·巴里尔
Owner CENT NAT DE LA RECHERCHE SCI