Wind measurement laser radar and wind measurement method based on atmospheric molecular absorption
A technology of wind measurement lidar and molecular absorption, which is applied in the field of laser remote sensing, can solve problems such as system errors, achieve the effects of improving reliability, reducing costs, and eliminating important error sources
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Embodiment 1
[0068] In the present embodiment, suppose lidar measures the wind velocity profile below 2km, the selected atmospheric molecule is O 2 , selected O 2 The absorption line is λ 0 =769.23386nm, the non-absorbing wavelength λ closest to the absorption peak E =769.40832nm as the reference wavelength; the working wavelength λ L =769.23154nm and working wavelength λ R =769.23618nm, such as figure 2 shown;
[0069] A lidar wind measurement method based on the absorption of atmospheric molecules, such as figure 1 As shown, the steps of the method include:
[0070] (1) The laser emitting module 1 first emits to the atmosphere with a working wavelength of λ L The laser pulse is then emitted into the atmosphere with an interval of 100μs and the working wavelength is λ R The laser pulses are emitted to the atmosphere with an interval of 100μs and the working wavelength is λ E Laser pulses of three wavelengths; after entering the atmosphere, the laser pulses of three wavelengths a...
Embodiment 2
[0088] In this embodiment, assume that the lidar measures the wind speed profile below 2 km, and the selected atmospheric molecule is CO 2 , the selected CO 2 The absorption line is λ 0 =2072.63487nm, the nearest non-absorbing wavelength λ to the absorption peak E =2074.70739nm as the reference wavelength; the working wavelength λ L =2072.60334nm and working wavelength λ R = 2072.67095 nm.
[0089] A lidar wind measurement method based on atmospheric molecular absorption, the steps of the method comprising:
[0090] (1) The laser emitting module 1 emits to the atmosphere at the same time with a working wavelength of λ L , lambda R and lambda E The laser pulses of three wavelengths are simultaneously backscattered after entering the atmosphere to generate echo photons;
[0091] (2) The receiving optical module 2 collects backscattered echo photons from the atmosphere, and uses the interference filter and FP etalon to separate the collected echo photons according to the ...
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