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

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...

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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 disadvantages of large volume, poor stability of the optical path built by space optical devices, high cost, and insufficient intelligent control methods

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