All-fiber direct detection anemometric laser radar system and closed-loop control method thereof

A wind-measuring lidar, closed-loop control technology, applied in radio wave measurement systems, measurement devices, fluid velocity measurement, etc., can solve the problems of poor optical path stability, high cost, and insufficiently intelligent control methods.

Inactive Publication Date: 2014-01-08
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the existing direct detection wind laser radar has the disadvanta...

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  • All-fiber direct detection anemometric laser radar system and closed-loop control method thereof
  • All-fiber direct detection anemometric laser radar system and closed-loop control method thereof
  • All-fiber direct detection anemometric laser radar system and closed-loop control method thereof

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] as attached figure 1 In the general design drawing, the radar is an all-fiber direct detection wind lidar without exposed space optical path. The system is divided into four parts, optical transmission part, frequency locking part, transmission part and receiving part.

[0026] The optical transmitting part is used to transmit modulated and amplified laser pulses of specific frequency and specific pulse width; the frequency locking part is used to detect the laser frequency drift and feed it back to the laser transmitting part, adjust the laser frequency according to the drift, and then calibrate and lock the laser frequency ;The transmitting part is used to transmit the laser pulse into the atmosphere at a specific ...

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Abstract

The invention discloses an all-fiber direct detection anemometric laser radar system and a closed-loop control method thereof. The system comprises an optical emission part, a frequency locking part, an emission part and a receiving part, wherein the optical emission part is used for emitting a modulated and amplified laser pulse; the frequency locking part is used for detecting the laser frequency variation, feeding back to the laser emission part, adjusting the laser wavelength and further realizing the function of locking the laser wavelength according to the deviation; the emission part is used for enabling the laser beam to point to the detection zone of the atmosphere, coupling the atmospheric back scattered light to a receiver through an optical telescope and modulating the near field signal strength; the receiving part is used for filtering out sun background from a signal and dividing the signal into two paths, one path of signal passes through a Fabry-Perot interferometer, the other path of signal is used as energy reference, the transmittance is obtained through the ratio of the signal intensities of the two paths of signal, and the wind velocity is obtained through inversion according to Doppler frequency shift. The laser radar adopts an all-fiber structure and has the advantages of small size and light weight, the manufacturing cost of the radar is low, the laser radar is controlled through a 3-level closed-loop, and the environmental adaptability and working stability of the laser radar are improved.

Description

technical field [0001] The invention belongs to the technical field of direct detection and wind measurement laser radar, and in particular relates to an all-fiber direct detection and wind measurement laser radar and a closed-loop control method thereof. Background technique [0002] Since the 1980s, the direct detection wind lidar technology has become more and more mature, and the direct detection technology has gradually attracted attention in the field of wind lidar with its unique advantages (high spatial and temporal resolution, high measurement accuracy, and large spatial coverage, etc.) . [0003] In 1989, the French Chanin research group first reported the measurement of the average wind field lidar in the middle atmosphere. The wind lidar system used the double-edge technology of the FP (Fabry-Perot) etalon, and used the molecular backscattering signal to retrieve the horizontal wind speed of the atmosphere. The one-dimensional component, whose working wavelength...

Claims

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Application Information

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IPC IPC(8): G01S17/95G01S7/486
CPCG01P5/26G01S7/4861G01S17/95Y02A90/10
Inventor 夏海云赵若灿窦贤康孙东松上官明佳舒志峰韩於利
Owner UNIV OF SCI & TECH OF CHINA
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