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Device for measuring wind speed

a technology for measuring devices and wind speed, applied in the direction of fluid speed measurement, speed/acceleration/shock measurement, instruments, etc., can solve the problem of particularly expensive devices for emitting laser beams, and achieve the effect of satisfying results

Inactive Publication Date: 2016-08-25
EPSILINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention proposes a wind speed measurement device that is cheaper. By using a focal distance between 5 cm and 2 m, the device can measure wind speed by analyzing the self-mixing phenomenon. By focusing at a shorter distance, more light is collected, resulting in a stronger signal. Additionally, a focal distance greater than 5 cm is used to prevent interference from air movement in the focus area. As a result, the device provides accurate and reliable results.

Problems solved by technology

Such a device for emitting laser beams is particularly costly to make.

Method used

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  • Device for measuring wind speed
  • Device for measuring wind speed

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Embodiment Construction

[0038]A wind speed measurement device 10 is represented in FIG. 1.

[0039]This device 10 comprises a laser beam emission means 12. The means 12 comprises a laser diode, for example a Fabry-Perot diode, emitting in single longitudinal mode, at a wavelength of 785 nm in this example. Other wavelengths can be used. In this example, the power of the laser diode 12 is between 0 and 30 mW. This laser diode 12 comprises an optical cavity 14 for amplifying the emitted laser light. The device 10 also comprises a focusing means 16, able to focus the beam emitted by the photodiode 12 towards a focus space 18. The focus volume 18, or effective volume, is at a distance D from the focusing means 16, this distance D corresponding to the focal distance of the device. The focal distance D is between 5 cm and 2 m.

[0040]The device 10 also comprises a means 20 for receiving a reflected beam. More specifically, this means 20 is configured to receive a beam emitted by the diode 12, after this beam is refle...

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Abstract

A device comprises: an emitting element for emitting a laser beam, referred to as an emitted beam; a focusing element for focusing the emitted beam at a predetermined focal distance (D); a receiving element for receiving the emitted beam after being reflected by a particle in the air (18), referred to as a reflected beam; a transmitting element for transmitting the signal of interference occurring between the emitted beam and the reflected beam to a signal processor in order to deduce the speed of the particle therefrom. The emitting element includes a laser diode and the receiving element is combined with the laser diode by self-mixing. The focal distance is between 5 cm and 2 m.

Description

BACKGROUND[0001]1. Technical Field[0002]The invention relates to the field of wind measurement, particularly when using laser light.[0003]2. Description of the Related Art[0004]A prior art anemometer using a LIDAR (Light Detection And Ranging) system is known, particularly from document WO 2009 / 046717. This device emits a laser beam, focused by an optical system at a focal distance of several dozen meters, targeting a measurement volume in which particles in the air are blown about by the wind. These particles reflect the light received, emitting a beam in the direction of the optical system, referred to as the reflected beam. The LIDAR receives the beam reflected by the particles, and then processes the interference occurring between the emitted beam and the reflected beam in order to deduce the speed of the particles, as the frequency shift between the emitted beam and the reflected beam is dependent on this speed due to the Doppler effect.[0005]Such a device for emitting laser be...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01P5/26
CPCG01P5/26G01S17/58G01N15/1429G01N2015/0046G01N2015/1447G01N2015/1454G01F1/663G01N15/0205G01N2015/1486G01N2015/1027
Inventor LEPAYSAN, CHRISTOPHETEYSSEYRE, RAPHAËL
Owner EPSILINE