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Depolarization ratio measurement using single photomultiplier tube in micropulse lidar

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4 Author(s)
Dubey, P.K. ; Radio and Atmospheric Science Division, National Physical Laboratory, New Delhi 110012 India ; Jain, S.L. ; Arya, B.C. ; Kulkarni, Pavan S.

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The conventional dual polarization micropulse lidar uses two separate photomultiplier tubes (PMT) to detect both the copolarized and cross-polarized beam. The prominent sources of error in the depolarization ratio measurement are mismatch in PMT, improper selection of discriminator threshold and unequal PMT high voltage. In the present work a technique for the measurement of lidar depolarization ratio using only one PMT sensor has been developed. The same PMT detects both copolarized and cross-polarized lidar backscatter. A stepper motor is used along with the mirrors to bring both the received polarization signals over the PMT window. Application of the same PMT minimizes the error caused in the depolarization ratio measurement due to error in photon counting of an individual channel. The design description of this technique along with the preliminary results depicting its functionality has been mentioned in this article.

Published in:

Review of Scientific Instruments  (Volume:80 ,  Issue: 5 )

Date of Publication:

May 2009

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