All-fiber laser radar aerosol detecting device

Abstract

The invention discloses an all-fiber laser radar aerosol detecting device. The all-fiber laser radar aerosol detecting device comprises a signal emitting channel, a signal receiving channel and a signal processing channel, wherein the signal emitting channel is used for emitting a laser signal, the signal receiving channel is used for receiving the emitted laser signal and an echo signal produced by the part, emitted to the atmosphere, of the laser signal, the signal processing channel is used for converting the echo signal into an electric signal for performing analyzing, and the signal emitting channel, the signal receiving channel and the signal processing channel are all of an all-fiber structure. The all-fiber laser radar aerosol detecting device has the advantages of continuous high repetition frequency, high sensitivity and the like, the adopted all-fiber structure can detect signals with the picowatt magnitude reaching to 20 kHz, a very high temporal-spatial resolution is achieved, and the whole system is small in size and high in stability.

Description

technical field [0001] The invention belongs to the field of laser radar, in particular to an all-fiber laser radar aerosol detection device. Background technique [0002] Atmospheric aerosols refer to liquid or solid particles suspended in the atmosphere with a diameter of 0.001-100um. Its production is affected by many factors including natural sources (volcanoes, sandstorms, etc.) and artificial sources (industry, agricultural activities, etc.). Although the content of aerosol in the atmosphere is relatively small, it can change the circulation pattern of the atmosphere, affect the air quality and climate change in local areas, and even endanger people's personal health and living environment. Therefore, the research on aerosol detection has also received more and more attention in recent years. [0003] Lidar is one of the effective means to detect atmospheric parameters. It is an active remote sensing device with high temporal and spatial resolution that can continuous...

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Problems solved by technology

[0005] Previous technology [2] (Bo Guangyu et al. Rayleigh-Raman-Mie scattering lidar for detecting atmospheric temperature and aerosols [J]. Acta Optics Sinica, 2010, 30(1)) gave the tropospheric temperature, Conventional observation data of aerosols, using a 532nm pulsed solid-state laser, at a repetition rate of 20Hz, accumulated 10,000 pulse signals to obtain a spatial resolution of 30m; previous technology [3] (Zhou jun, et al.Two-Wavelength Mie Lidar for Monitoring of Tropospheric Aerosol [J]. Acta Optica Sinica, 2000, 20 (10)) established a dual-wavelength Mie scattering lidar to simultaneously detect the vertical profile of the tropospheric aerosol extinction coefficient at two wavelengths of 532nm and 1064nm, also using pulse Solid-state lasers and spatial optical paths are used to detect echo signals. The structure is large and complex (water cooling is required), the repetition frequency is low, and the resolution is limited.

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