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Atmospheric temperature measurement laser radar based on frequency down-conversion and atmospheric temperature measurement method

A frequency down-conversion, lidar technology, applied to thermometers, thermometers, measuring devices, etc. with physical/chemical changes, can solve the problems of short incident wavelength, poor stability, and limited bandwidth of spatial optical filters. The scattering coefficient, the effect of increasing the intensity

Pending Publication Date: 2019-07-16
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Therefore, the 1.5 micron laser cannot perform effective detection of rotational Raman and Rayleigh signals
[0004] However, in the short-wavelength region, the bandwidth of spatial optical filters is limited, and they are expensive and have poor stability
For example, when a narrow-band spatial optical Fabry-Perot interferometer is used, due to the short incident wavelength, the surface accuracy of the interferometer surface is required to be high, and the spatial optical path is easily affected by changes in ambient temperature, pressure and humidity. poor sex

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  • Atmospheric temperature measurement laser radar based on frequency down-conversion and atmospheric temperature measurement method
  • Atmospheric temperature measurement laser radar based on frequency down-conversion and atmospheric temperature measurement method
  • Atmospheric temperature measurement laser radar based on frequency down-conversion and atmospheric temperature measurement method

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other Embodiment approach

[0055] In other implementation manners, the laser module 1 can also be a pulsed laser that meets detection requirements, and directly emits laser pulses that meet atmospheric detection conditions.

[0056] In the embodiment of the present invention, the laser emitting module 21 and the laser receiving module 22 may be of a separated transceiver structure; the laser emitting module 21 and the laser receiving module 22 may also be configured as a transceiver coaxial structure, and Share a telescope.

[0057] Such as figure 1 As shown, the frequency down conversion module 3 includes: a pump laser 31, the pump laser 31 is used to emit pump laser light; a wavelength division multiplexer 32, the wavelength division multiplexer 32 is used to combine the The backscattering signal is coupled with the pump laser; the nonlinear waveguide 33 is used for frequency down-converting the backscattering signal, specifically, the nonlinear waveguide 33 is used for converting the backscattering ...

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Abstract

The invention discloses an atmospheric temperature measurement laser radar based on frequency down-conversion and an atmospheric temperature measurement method. The technical scheme employs short-wavelaser so as to improve the backward scattering coefficients of Rayleigh scattering and rotational Raman scattering; and at a laser radar receiving end, a frequency down conversion technology is adopted to convert the wavelength of the detection light to an optical communication wave band, and a filter and a detector in the optical communication wave band are employed to process and detect the atmospheric echo signals related to the temperature so as to invert the atmospheric temperature information. The difficulty that near-infrared laser Rayleigh and rotational Raman backscattering signals are weak is overcome, and the problems that on the short wavelength, a space optical filter is large in bandwidth, high in price and poor in stability are solved.

Description

technical field [0001] The present invention relates to the technical field of temperature measurement laser radar, more specifically, relates to a kind of atmospheric temperature measurement laser radar and atmospheric temperature measurement method based on frequency down-conversion. Background technique [0002] Temperature is an important parameter of the state of the atmosphere. It is of great significance in the fields of atmospheric dynamics, climatology and atmospheric chemistry, and in the study of scientific issues such as global warming, intermediate temperature inversion layers, and Earth's gravity waves. The existing atmospheric temperature measurement lidar includes rotational Raman lidar, Rayleigh integral lidar and resonant fluorescence lidar, the joint observation of these three radars can cover the ground to the bottom of the thermosphere. Among them, the rotating Raman lidar can cover from the ground to the top of the stratosphere, the Rayleigh integral li...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01K11/00
CPCG01S17/95G01K11/00Y02A90/10
Inventor 上官明佳夏海云薛向辉窦贤康
Owner UNIV OF SCI & TECH OF CHINA
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