All-fiber coherent wind lidar and wind measurement method thereof

A coherent wind measurement and lidar technology, applied in measurement devices, radio wave measurement systems, and electromagnetic wave re-radiation, etc., can solve problems such as increasing system complexity and cost, reducing signal-to-noise ratio, and reducing wind speed accuracy. Low cost, low complexity, and guaranteed signal-to-noise ratio

Active Publication Date: 2016-03-30
北京华信科创科技有限公司
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Problems solved by technology

Since the Doppler frequency shift is relatively small at low wind speeds, the frequency difference between the fundamental frequency signal and the frequency-shifted echo signal is very small, and it is not easy to obtain. The frequency difference between the large fundamental frequency signal and the frequency-shifted echo not only increases the complexity and cost of the system, but also increases the load on the entire system, and also reduces the signal-to-noise ratio of the signal, thereby reducing the measured wind speed the accuracy of

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  • All-fiber coherent wind lidar and wind measurement method thereof
  • All-fiber coherent wind lidar and wind measurement method thereof
  • All-fiber coherent wind lidar and wind measurement method thereof

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[0027] A schematic diagram of the structure of an all-fiber coherent wind lidar in this embodiment is as follows figure 1 As shown, it includes a photonic crystal laser 1, an optical fiber circulator device 4, an optical detection device 6, a transmitting / receiving optical device 5, and a signal processing and laser driving device 7; the photonic crystal laser 1 emits a laser signal, and the wavelength of the laser signal depends on the driving current The change in a certain range is linearly modulated; the fiber circulator device 4 includes three ports, the laser signal emitted by the photonic crystal laser 1 is transmitted to the first port 41, and a part of the laser signal input by the first port 41 is transmitted to the second port Reflected at the end face of 42, it is transmitted to the optical detection device 6 through the third port 43, and this part of the laser signal is used as the base frequency signal, and the other part of the laser signal input from the first ...

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Abstract

The invention relates to the technical field of wind lidars, and, more specifically, relates to an all-fiber coherent wind lidar, taking a photonic crystal laser as a light source, and a wind measurement method of the all-fiber coherent wind lidar. The all-fiber coherent wind lidar comprises the photonic crystal laser, a fiber circulator device, an optical detection device, a transmitting/receiving optical device, and a signal processing and laser drive device. The method carries out the linear modulation of a drive current supplied by the signal processing and laser drive device to the photonic crystal laser, so as to obtain fundamental frequency and echo signals with bigger frequency shifts. The frequency mixing of the fundamental frequency and echo signals is carried out so as to obtain a differential frequency signal. The method carries out the processing and calculation of the differential frequency signal, thereby obtaining the radial wind speed and wind direction through measurement. The all-fiber coherent wind lidar is low in complexity, is low in cost, is high in signal to noise ratio of a transmitted laser signal, and can measure the high-precision radial wind speed and direction.

Description

technical field [0001] The present invention relates to the technical field of wind-measuring lidar, and more specifically, relates to an all-fiber coherent wind-measuring lidar using a photonic crystal laser as a light source and a wind-measuring method thereof. Background technique [0002] Wind lidar technology uses the Doppler effect to measure wind speed by measuring the frequency shift of the reflected laser beam. This technology is mainly divided into two categories: direct measurement method and coherent measurement method. Since direct measurement method usually uses F-P etalon to measure Doppler frequency shift and requires a relatively complex optical system, coherent measurement method is more and more popular. s concern. [0003] The coherent measurement method mixes the base frequency signal and the frequency-shifted echo signal to obtain the difference frequency signal, and then obtains the wind speed through the signal processing circuit. Since the Doppler ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 孙鲁苏秉华蔡波
Owner 北京华信科创科技有限公司
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