Time division multiplexing based single-detector all-fiber polarization lidar

Abstract

The invention discloses a time division multiplexing based single-detector all-fiber polarization lidar. The lidar adopts all-fiber link, utilizes a delay fiber to realize time division multiplexing, and uses a single detector to realize simultaneous detection of parallel polarization signals and vertical polarization signals in radar echoes. Detection of atmospheric depolarization ratio is realized with the single detector, and the liar has the advantages of low cost, system stability, relative eye safety, all-fiber link, compact structure and the like.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a single-detector all-fiber polarization laser radar based on time division multiplexing. Background technique [0002] Air pollution has become one of the major problems my country faces in the 21st century. Among them, aerosol pollution is the main component of air pollution in the atmospheric boundary layer. Acidic spherical particles produced by automobile exhaust and industrial emissions and non-spherical particles mainly caused by ground dust have become the main source of aerosols at the bottom of the city, causing great harm to human health and the living environment. The inhalable Particulate matter PM2.5 is a direct threat to human life. [0003] At present, the ground-based aerosol remote sensing methods carried out in China mainly include broadband spectral radiation remote sensing of direct solar radiation, multi-band photometer remote sensing, remote sensing b...

AI Technical Summary

Problems solved by technology

[0008] To sum up, most of the above polarized lidar systems use visible light band or 1064nm laser source, the output power is high, the human eye is not safe, and the system is huge; the space optical path system is used, and the structure is unstable; it is greatly affected by the sun and sky background radiation, and cannot be used during the daytime. work, low signal-to-noise ratio

In addition, these systems all use dual detectors to detect two echo signals with different polarization states, which is expensive, and the depolarization ratio is affected by the fluctuation of the detector efficiency, and the signal-to-noise ratio is low

Images