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A New Method for Reduction of Photomultiplier Signal-Induced NoiseFor lidar measurements of ozone, photomultiplier tube (PMT) detector signal-induced noise represents a fundamental problem that complicates the extraction of information from lidar data. A new method is developed to significantly reduce signal-induced noise in lidar receiver PMT detectors. The electron optics of the lidar photomultiplier detector is modified to filter the source of signal-induced noise. A mesh electrode external to the PMT is utilized to control photoemission and disorient electron trajectories from the photocathode to the first dynode. Experiments were taken both with simulated and actual lidar return signals at Langley Research Center. Results show at least 40 percent more accurate ozone number density values with a mesh voltage of 60 V applied than with no voltage applied.
Document ID
20000013443
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Koble, Andrea (Lund Univ. Sweden)
DeYoung, Russell (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Optics
Report/Patent Number
L-17843
NAS 1.15:209836
NASA/TM-2000-209836
Report Number: L-17843
Report Number: NAS 1.15:209836
Report Number: NASA/TM-2000-209836
Funding Number(s)
PROJECT: RTOP 274-00-99-24
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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