Preliminary Investigation of Vertical Measurement of Atmospheric Pressure Using Ground-Based Differential Absorption Lidar
(2.University of Chinese Academy of Sciences, Beijing, China 100049)
【Abstract】Atmospheric pressure is one of the most important meteorological parameters. In this work, to realize spaceborne laser remote sensing of atmospheric pressure, we conduct investigations of ground-based lidar measurement investigations. A 532-nm laser pulse produced by the second-frequency of a single longitudinal-mode Nd:YAG laser is used as a pump source. An optical parametric oscillator and an optical parametric amplifier with the KTP (KTiOPO4) crystal as a nonlinear conversion medium generate two laser pulses with wavelengths of 760.236 and 760.307 nm, with the pulse energy of 40 mJ. A ϕ350-mm telescope receives the backscattering of the atmosphere, the differential optical depth of two wavelengths between different altitudes and the lidar is obtained. The effective detection altitude range of the ground-based differential absorption lidar is 500–4 000 m, and the time resolution is 1–5 min. The investigations show that the differential optical depth corresponds to the pressure difference between different altitudes of the atmosphere and the lidar, and the numerical expression of the corresponding relationship can be obtained.
【Keywords】 remote sensing; remote sensor; differential absorption lidar; optical parametric oscillator; optical parametric amplifier; differential optical depth; atmospheric pressure;
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