Double wave length liquid altitude deection laser radar

Abstract

The present invention dislcoses a kind of double wavelength laser radar capable of detecting high altidude atmosphere in wide 30-110 Km range. In the hardware configuration basically the same as that in a common sodium layer fluorescent laser radar, the laser radar combines the two operating mechanism of Rayleigh scattering and sodium layer resonance fluorescence. By means of double wavelength emission and spitted spectroscopic double fiber reception, one laser radar can be used to detect the atmosphere in both middle altitude and high altitude of wide 20-110 Km range simultaneously and complete all the functions of both Rayleigh scattering laser radar and sodium layer resonance fluorescence laser radar.

Description

Technical field: [0001] The present invention relates to a laser radar, and more particularly to a dual-wavelength high-altitude detection laser radar. It is suitable for space physics research, atmospheric science research, and environmental protection, meteorology, aviation, aerospace, military and other fields. Background technique: [0002] Lidar has outstanding advantages such as high temporal and spatial resolution, large dynamic range, no detection blind spots, and the ability to distinguish the types of detected objects. It has been widely used in high-precision remote sensing of the atmosphere. Studies have shown that there are many complex physical, chemical and dynamic processes in the sky in the range of 30-110 kilometers, which is an extremely important link in the relationship between Japan and the earth. The understanding of the space environment and global changes can improve the accuracy of weather forecasts. At the same time, it is also of great significan...

AI Technical Summary

Problems solved by technology

Among them, the Rayleigh scattering lidar includes: France's Serviced'Aeronomie du C.N.RS, which uses a Φ800mm receiving telescope and a 5W laser transmitter, with a detection height of 30-80 kilometers; Japan's Kyushu University, which uses a Φ500mm The receiving telescope and laser transmitter with a power of 16W have a detection height of 30-70 kilometers; the disadvantage of using Rayleigh scattering lidar is that its maximum detection height is generally below 80 kilometers; it is technically difficult to further increase its detection height Large, expensive, and complicated to operate; even regardless of cost, its theoretical maximum detection height is less than 100 kilometers

Sodium layer fluorescence laser radar includes: the University of Illinois in the United States uses a receiving telescope of Φ1200mm and a laser transmitter with a power of 10W; the University of Bonn in Germany uses a receiving telescope of Φ1000mm and a laser transmitter with a power of 3W. The altitude range is 80-110 kilometers; the disadvantage of using sodium layer fluorescence lidar is that, limited by the height of the atmospheric sodium layer, its detection height can only be within the range of 80-110 kilometers

If the Rayleigh scattering lidar and the sodium layer fluorescence lidar are used at the same time, although the purpose of detecting the middle and upper atmosphere of 30-110 kilometers can be achieved, the manpower, funds, and sites used will increase exponentially, and the two It is difficult for a laser radar to realize simultaneous detection of the same area, which will also affect the accuracy of detection

Therefore, this method of simply adding two laser radars is not a scientific and reasonable solution

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