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Rotational Raman lidar system for high-precision measurement of atmospheric temperature in height range of 0-35km

A technology of atmospheric temperature and rotational Raman, which is applied in the field of lidar remote sensing detection, can solve the problems of simultaneous effective reception and other problems

Active Publication Date: 2017-09-08
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

It can be seen that in the case of given laser power, telescope aperture, and optical receiving system efficiency, it is difficult to simultaneously effectively receive high-altitude weak signals and low-altitude strong signals.

Method used

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  • Rotational Raman lidar system for high-precision measurement of atmospheric temperature in height range of 0-35km
  • Rotational Raman lidar system for high-precision measurement of atmospheric temperature in height range of 0-35km

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Embodiment Construction

[0020] The invention is composed of a transmitting unit, an optical receiving unit, a data acquisition and a control unit. combined with figure 1 , the embodiments of the present invention are specifically stated as follows.

[0021] The launch unit includes a seed-injected solid-state laser, a beam expander and a launch platform. A solid-state laser (United States, Continuum, Powerlite 9030) produces a single pulse energy of ~800 mJ after seed injection, and a 532.23 nm laser output with a repetition rate of 30 Hz (linewidth -1 ). The self-made beam expander enlarges the diameter of the incident laser beam and compresses the divergence angle of the incident laser beam with a magnification of 8 times. The electronically controlled launcher (Kohzu, Japan) has two-dimensional adjustment capabilities, and can accurately direct the horizontal laser beam to the direction of the zenith with a reflectivity of >99.5%.

[0022] The optical receiving unit includes a low-altitude det...

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Abstract

The present invention discloses a rotational Raman lidar system for high-precision measurement of atmospheric temperature in a height range of 0-35km. The system employs a layered receiving technology, a low altitude detection module and a high altitude detection module are employed to perform detection of atmosphere in the height ranges of 0-15km and 8-25km; and the system employs two work modes of simulation AD and photon counting PC to effectively record echo data of high and low altitude detection modules. Finally, the system realizes high-precision complete-coverage measurement of atmospheric temperature in the height range of 0-35km.

Description

technical field [0001] The invention belongs to the technical field of laser radar remote sensing detection, and specifically relates to a rotating Raman laser radar system capable of measuring atmospheric temperature from near the ground to a height range of 35 km accurately and with high temporal and spatial resolution. Background technique [0002] The altitude range from near the ground to 35 km is an important altitude interval of the entire Earth's atmosphere: downward, it includes the atmospheric boundary layer, which is the direct interaction area between the surface and the atmosphere; upward, it includes the transition zone between the lower atmosphere and the middle and upper atmosphere. Accurate and high-resolution monitoring of atmospheric temperature in the altitude range of ~0-35 km is crucial for finely characterizing the changes and transport of atmospheric substances, energy / momentum, etc. in the vertical direction. Lidar can work continuously and has the a...

Claims

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Application Information

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IPC IPC(8): G01S17/95G01S7/481
CPCG01S7/4816G01S17/95Y02A90/10
Inventor 易帆柳付超张云鹏余长明何裕金谭莹翁淼易洋潘向亮
Owner WUHAN UNIV
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