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Rayleigh-Doppler laser radar ground calibration system

A calibration system and lidar technology, applied in the field of Rayleigh Doppler lidar ground calibration system, can solve problems such as system errors, and achieve the effect of easy implementation and easy engineering cost.

Inactive Publication Date: 2012-11-28
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Secondly, in areas with relatively high aerosol content, if the influence of Brillouin scattering is considered, the relationship between the frequency response function and temperature will no longer be an explicit expression, so the temperature inversion using the atmospheric model In the case of wind field, new system errors will also be introduced

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  • Rayleigh-Doppler laser radar ground calibration system
  • Rayleigh-Doppler laser radar ground calibration system
  • Rayleigh-Doppler laser radar ground calibration system

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the examples, but the protection scope of the present invention should not be limited thereto.

[0024] like figure 2 , 3 As shown, a Rayleigh Doppler lidar ground calibration system is characterized in that it includes: laser 1, beam splitter 2, beam expander 3, first reflector 4, second reflector 5, airtight pipeline 6, telescope 7. Collimator 9, etalon 10, converging lens 11, detector 12 and computer 14.

[0025] The beam generated by the laser 1 is divided into two beams by the beam splitter 2, a small part of which is directly sent to the collimator 9 as a reference signal through the first multimode fiber 13, thereby obtaining the spectral function G of the pulse emitted by the laser 1 L (v), and sent to the computer 14; and most of them are then expanded by the beam expander 3 and then imported into the airtight pipeline 6 by the first reflector 4 and the second reflector 5, and the proc...

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Abstract

The invention discloses a Rayleigh-Doppler laser radar ground calibration system. A light beam generated by a laser is divided into two beams through a beam splitter; one small portion is directly sent to a first detector through multi-mode optical fibers to serve as a reference signal; and most portion after being expanded by a beam expander is then guided into a sealed pipeline by a reflecting mirror; after the laser is scattered by air in the sealed pipeline, scattered signals are received by a telescope and then guided in through the multi-mode optical fibers to be sent to a standard tool for signal treatment; signals transmitting through the standard tool are sent to the detector by a convergent lens for further signal analysis treatment; and finally, the detector sends the result of the signal treatment to a computer. As a dependence relationship from a precise Rayleigh- Brillouin scattering frequency spectrum function and a frequency response function to a temperature is obtained by emitting laser signals in a ground sealed container and receiving as well as processing echo signals is obtained, the Rayleigh-Doppler laser radar ground calibration system, disclosed by the invention, has the advantages of providing calibration for inverse algorithm and improving measurement precision.

Description

technical field [0001] The invention relates to a Rayleigh Doppler laser radar ground calibration system, which belongs to the technical field of optics and laser remote sensing. Background technique [0002] Rayleigh Doppler lidar is a measurement system widely used in the observation of wind field in the middle and upper atmosphere. It achieves high-precision inversion of wind speed and wind direction information by emitting laser pulses and receiving echo signals scattered by the atmosphere. [0003] The wind field information is obtained by inverting the atmospheric scattering echo signal. Therefore, the inversion algorithm is directly related to the measurement accuracy of Doppler lidar. The usual inversion algorithm obtains the Doppler frequency shift by determining the frequency response function, and then inverts the wind speed and wind direction information. The frequency response function is defined as the ratio of the transmittance of the atmospheric backscatte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/497
Inventor 窦贤康韩於利孙东松夏海云舒志峰薛向辉陈廷娣
Owner UNIV OF SCI & TECH OF CHINA
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