Description: | See below for details of reprocessing that was completed on 20140822. Original DQR
category:3 (Yellow, Suspect ).
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Regions where photon counting rates exceed 20 MHz are 37.5 meters too high. Correct data
by shifting down 37.5 meters.
Additional information:
The detection system in the RL uses Licel data recorders. These recorders provide
simultaneous measurements of analog voltage and photon counts from the photo multiplier tubes.
The analog signal has an inherent delay relative to the photon counting signal, which is
corrected for in the rlprofmerge VAP. The delay parameter is determined through offline
analysis by the instrument mentor, and then inputted into a configuration file that is used
by the VAP.
During the effected period, the delay parameter for the narrow-field-of-view elastic
channel was incorrect. As a result, the analog signal leads the photon counting signal by 5
range bins (5X7.5m = 37.5m). Photon counting rates that are outputted by the rlprofmerge
VAP use the analog signals in regions where the photon counting rates exceed 20 MHz. So
the counting rate data in these regions are (incorrectly) shifted downward by 37.5 m (i.e.
-37.5m). |