Large dynamic wind detection lidar based on all-fiber scanning f-p interferometer

Abstract

The invention discloses a large dynamic wind field detection laser radar based on an all-fiber scanning F-P interferometer. The large dynamic wind field detection laser radar is characterized in that optical pulse emitted from a laser pulse generating unit points to detection atmosphere through a transmitting telescope; background noise of an echo signal is filtered by a background noise filtering unit; a reference signal and an atmospheric aerosol spectrum are scanned by a spectrum scanning unit; signal detection is realized by a single-photon detector; data acquisition and atmospheric wind velocity inversion are completed by a data acquisition unit and a processing unit. According to the large dynamic wind field detection laser radar, a back scattering spectrum of aerosol is scanned through a transmission spectrum and a reflective spectrum of the optical fiber F-P interferometer, and energy waste is avoided and influence of laser energy jitter on measurement is eliminated; weak atmospheric signals are detected by the single-photon detector; Doppler frequency shift symbols are discriminated by scanning a reference laser spectrum and the atmospheric aerosol spectrum simultaneously. The laser radar has the advantages of eye safety, large dynamic range of wind velocity measurement, long detection range and the like.

Description

technical field [0001] The invention relates to the field of laser radar, in particular to a large dynamic wind field detection laser radar based on an all-fiber scanning F-P interferometer. Background technique [0002] Atmospheric detection lidar has been widely used in speed measurement, imaging, pollutant monitoring, wind measurement, temperature measurement, density measurement, etc. detection and other fields. Atmospheric detection lidar emits laser pulses into the atmosphere and detects atmospheric echo signals to retrieve atmospheric visibility, atmospheric composition, density, wind speed, temperature and other information. [0003] Wind lidar is of great significance to improve the accuracy of long-term weather forecasts, improve climate research models, and improve military environment forecasts. Therefore, the measurement of atmospheric wind field has received more and more attention. Organizations such as the International Civil Aviation Agency, the World Mete...

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Problems solved by technology

In edge technology, in addition to the above two interferometers, high-resolution frequency discriminators such as molecular absorption lines, Michelson interferometers, gratings, prisms, and Mach-Zehnder interferometers can also be used; however, the dynamic range of wind speed that edge detection technology can measure Limited to the filtering edge of the discriminator

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