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There has been great difference between the theoretical signals of the lidar's echo and its actual signals, due to the angles between the laser beam and its receiving optical axis, and the laser intensity distribution being asymmetrical. So the correction of the echo signal is necessary. According to the mathematical derivation and the software simulation, the mathematical expression of the lidar's overlap factor is given, and the overlap factor curves with detection range are drawn which express the characters over the total detection range, then the best angle between lidar's emitting axis and the receiving axis is obtained. The overlap factors are analyzed when the laser is Gaussian with a uniform intensity distribution. The lidar distance correction signal and Klett formula are corrected by the overlap factor, and the instrument parameters of the lidor are measured. In the range where the overlap factor is not zero, its correction echo signals and extinction coefficients can be obtained by using the corrected Klett formula. While in the range of the lidar's blind zone, the signals can be derived by a slope method. Finally, the total correction curve of the extinction coefficients is gained, and it is in accordance with the actual one correction cuive.
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Keywords:
- lidar /
- correction /
- overlap factor /
- extinction coeffients
[1] Sasano Y 1979 Appl. Opt. 18 3908
[2] Gao F, Hua D X, Wu M, Mao J D, Zhou Y 2008 Acta Opt. Sin. 28 1649 (in Chinese) [高飞, 华灯鑫, 吴敏, 毛建东, 周毅 2008 光学学报 28 1649]
[3] Wang Z H, He Y H, Zuo H Y, Andrew Y S C, Yang J G 2006 Acta Phys. Sin. 55 3188 (in Chinese) [王治华, 贺应红, 左浩毅, 郑玉臣, 杨经国 2006 55 3188]
[4] Liu Q J, Yang L, Wang Y 2009 Acta. Phys. Sin. 58 7376 (in Chinese) [刘巧君, 杨林, 王予 2009 58 7376]
[5] Wei G, Fei Y M, Jun L 2011 Optics Communications. 284 2966
[6] Luis R I, V S S III, Stephen S, Jamie B, William M, Raymond T, John C, Roger M 2005 Applied Optics 44 1748
[7] Liu H T, Chen L F, Su L 2011 Acta Phys. Sin. 60 064204 (in Chinese) [刘厚通, 陈良富, 苏林 2011 60 064204]
[8] Klett J D 1981 Applied Optics 20 211
[9] Liu J 2008 Ph. D. Dissertation (Xi'an: Xi'an University of Technology) (in Chinese) [刘君 2008 博士学位论文 (西安: 西安理工大学)]
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[1] Sasano Y 1979 Appl. Opt. 18 3908
[2] Gao F, Hua D X, Wu M, Mao J D, Zhou Y 2008 Acta Opt. Sin. 28 1649 (in Chinese) [高飞, 华灯鑫, 吴敏, 毛建东, 周毅 2008 光学学报 28 1649]
[3] Wang Z H, He Y H, Zuo H Y, Andrew Y S C, Yang J G 2006 Acta Phys. Sin. 55 3188 (in Chinese) [王治华, 贺应红, 左浩毅, 郑玉臣, 杨经国 2006 55 3188]
[4] Liu Q J, Yang L, Wang Y 2009 Acta. Phys. Sin. 58 7376 (in Chinese) [刘巧君, 杨林, 王予 2009 58 7376]
[5] Wei G, Fei Y M, Jun L 2011 Optics Communications. 284 2966
[6] Luis R I, V S S III, Stephen S, Jamie B, William M, Raymond T, John C, Roger M 2005 Applied Optics 44 1748
[7] Liu H T, Chen L F, Su L 2011 Acta Phys. Sin. 60 064204 (in Chinese) [刘厚通, 陈良富, 苏林 2011 60 064204]
[8] Klett J D 1981 Applied Optics 20 211
[9] Liu J 2008 Ph. D. Dissertation (Xi'an: Xi'an University of Technology) (in Chinese) [刘君 2008 博士学位论文 (西安: 西安理工大学)]
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