Simulation and analysis of spectroscopic filter of rotational Raman lidar for absolute measurement of atmospheric temperature

Qimeng Li; Shichun Li; Xianglong Hu; Jing Zhao; Wenhui Xin; Yuehui Song; Dengxin Hua

doi:10.1117/12.2295230

12 January 2018 Simulation and analysis of spectroscopic filter of rotational Raman lidar for absolute measurement of atmospheric temperature

Qimeng Li, Shichun Li, Xianglong Hu, Jing Zhao, Wenhui Xin, Yuehui Song, Dengxin Hua

Author Affiliations +

Proceedings Volume 10619, 2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications; 106190L (2018) https://doi.org/10.1117/12.2295230
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

The absolute measurement technique for atmospheric temperature can avoid the calibration process and improve the measurement accuracy. To achieve the rotational Raman temperature lidar of absolute measurement, the two-stage parallel multi-channel spectroscopic filter combined a first-order blazed grating with a fiber Bragg grating is designed and its performance is tested. The parameters and the optical path structure of the core cascaded-device (micron-level fiber array) are optimized, the optical path of the primary spectroscope is simulated and the maximum centrifugal distortion of the rotational Raman spectrum is approximately 0.0031 nm, the centrifugal ratio of 0.69%. The experimental results show that the channel coefficients of the primary spectroscope are 0.67, 0.91, 0.67, 0.75, 0.82, 0.63, 0.87, 0.97, 0.89, 0.87 and 1 by using the twelfth channel as a reference and the average FWHM is about 0.44 nm. The maximum deviation between the experimental wavelength and the theoretical value is approximately 0.0398 nm, with the deviation degree of 8.86%. The effective suppression to elastic scattering signal are 30.6, 35.2, 37.1, 38.4, 36.8, 38.2, 41.0, 44.3, 44.0, 46.7 dB. That means, combined with the second spectroscope, the suppression at least is up to 65 dB. Therefore we can fine extract single rotational Raman line to achieve the absolute measurement technique.

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Qimeng Li, Shichun Li, Xianglong Hu, Jing Zhao, Wenhui Xin, Yuehui Song, and Dengxin Hua "Simulation and analysis of spectroscopic filter of rotational Raman lidar for absolute measurement of atmospheric temperature", Proc. SPIE 10619, 2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 106190L (12 January 2018); https://doi.org/10.1117/12.2295230

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KEYWORDS

Raman spectroscopy

Spectroscopy

Optical filters

Raman scattering

Scattering

Temperature metrology

LIDAR

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