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A pure rotational Raman-lidar based on three-stage Fabry-Perot etalons for monitoring atmospheric temperature

Hu Shun-Xing Wei He-Li Tan Kun Hu Huan-Ling Wang Shao-Lin Su Jia Zhao Pei-Tao Cao Kai-Fa

A pure rotational Raman-lidar based on three-stage Fabry-Perot etalons for monitoring atmospheric temperature

Hu Shun-Xing, Wei He-Li, Tan Kun, Hu Huan-Ling, Wang Shao-Lin, Su Jia, Zhao Pei-Tao, Cao Kai-Fa
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Publishing process
  • Received Date:  24 October 2007
  • Accepted Date:  06 December 2007
  • Published Online:  05 March 2008

A pure rotational Raman-lidar based on three-stage Fabry-Perot etalons for monitoring atmospheric temperature

  • 1. (1)中国科学院安徽光学精密机械研究所大气光学实验室,合肥 230031; (2)中国科学院安徽光学精密机械研究所大气光学实验室,合肥 230031;中国科学院研究生院,北京 100049

Abstract: A new pure rotational Raman-lidar system for monitoring atmospheric temperature is presented. Instead of using the double grating monochromator, the system employs two high resolution spectral resolving channels,each of which is composed of a three-stage Fabry-Perot etalon combined with a filter with band width of 7nm. The transmitting light source is an injection-seeded Nd:YAG laser. This configuration can achieve a high rejection rate (10-10) to Mie-Rayleigh elastic scattering (at 532nm wavelength),and has an extremely narrow receiving bandwidth (less than 10pm) for pure rotation Raman scattering of N2 with quantum numbers of ±6 and ±12 respectively. Therefore, the system effectively rejects the interference of background radiation and pure rotational Raman scattering of O2, and the measurement of daytime tropospheric temperature from a single Raman spectral line intensity ratio using the lidar system is made possible because of the narrow receiving bandwidth. The temperature measurement precision of this Raman-lidar is improved at the same time. At last, two_channels signals were simulated by using balloon-based sounding temperature profile. The simulation demonstrated the feasibility of this lidar for atmospheric temperature profile measurement.

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