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Proceedings Paper

Noise filtering of rotational Raman lidar using threshold amendment for atmospheric temperature measurement
Author(s): Weiguo Kong; Siying Chen; Yinchao Zhang; Tian Lan; Zongjia Qiu; Yuzhao Wang; Peng Liu; Guoqiang Ni
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Paper Abstract

Pure Rotational Raman Lidar is a new technique for detecting vertical troposphere temperature profile. Since the backscattering Raman signals are so weak that the photon-counting method is applied by using a multiscaler. By setting the threshold of the multiscaler, most noises mixed with the signals can be filtered. However, difference exists between the set threshold and the actual threshold of the two count channels, and also exists between the set thresholds of the two count channels. This will affect quick-setting of the appropriate thresholds. In this paper, a rule is put forward and the measuring system is established to confirm the set threshold value corresponding to an actual one, making use of the amplitude fluctuation of square wave. By this system, pairs of set threshold and actual threshold are obtained, and the curve of the set threshold against the actual threshold of a single count channel, as well as the curve of thresholds of the two count channels, is fitted. The theoretical analysis is well agreed with the experimental results, and it indicates that the appropriate threshold can be set more quickly by using the curve.

Paper Details

Date Published: 20 November 2009
PDF: 10 pages
Proc. SPIE 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 75111W (20 November 2009); doi: 10.1117/12.838116
Show Author Affiliations
Weiguo Kong, Beijing Institute of Technology (China)
Siying Chen, Beijing Institute of Technology (China)
Yinchao Zhang, Beijing Institute of Technology (China)
Tian Lan, Beijing Institute of Technology (China)
Zongjia Qiu, Beijing Institute of Technology (China)
Yuzhao Wang, Beijing Institute of Technology (China)
Peng Liu, Beijing Institute of Technology (China)
Guoqiang Ni, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 7511:
2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems
Shenghua Ye; Guangjun Zhang; Jun Ni, Editor(s)

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