DQR ID | Subject | Data Streams Affected |
---|---|---|
D070423.2 | SGP/RL/C1 - Interference filter replaced temporarily | sgp10rlprofasr1ferrC1.c1, sgp10rlprofbe1turnC1.c0, sgp10rlprofbe1turnC1.c1, sgp10rlprofdep1turnC1.c1, sgp10rlprofext1ferrC1.c1, sgp10rlprofmr1turnC1.c1, sgprlC1.00, sgprlC1.a0 |
D070717.1 | SGP/RL/C1 - Invalid liquid water channel data | sgprlC1.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/09/2007 | 1615 | 03/23/2007 | 1310 |
Subject: | SGP/RL/C1 - Interference filter replaced temporarily |
DataStreams: | sgp10rlprofasr1ferrC1.c1, sgp10rlprofbe1turnC1.c0, sgp10rlprofbe1turnC1.c1, sgp10rlprofdep1turnC1.c1, sgp10rlprofext1ferrC1.c1, sgp10rlprofmr1turnC1.c1, sgprlC1.00, sgprlC1.a0 |
Description: | The sensitivity of the Raman lidar has been degrading since the fall of 2005. One possible source of the degradation is the interference filters; i.e., their transmission could be becoming smaller for some reason. To evaluate this hypothesis, we removed the interference filter from the narrow field-of-view nitrogen channel (i.e., the N2 high channel) on 3/9/2007, and replaced it with its spare. The original filter was sent to the manufacturer for evaluation. Its transmission was measured by the manufacturer to be nearly identical to its original performance; in other words, the filter is not responsible for the lidar's loss of sensitivity. The original interference filter was reinstalled in the system on 3/23/2007. The temporary use of the spare interference filter in the high N2 channel should not affect the data quality, as the transmission characteristics of the spare and the original filter are nearly identical. |
Measurements: | sgp10rlprofdep1turnC1.c1:
sgp10rlprofmr1turnC1.c1:
sgp10rlprofext1ferrC1.c1:
sgprlC1.00:
sgp10rlprofasr1ferrC1.c1:
sgp10rlprofbe1turnC1.c1:
sgprlC1.a0:
sgp10rlprofbe1turnC1.c0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/06/2006 | 1920 | 03/05/2008 | 0000 |
Subject: | SGP/RL/C1 - Invalid liquid water channel data |
DataStreams: | sgprlC1.a0 |
Description: | On 20060906, the liquid water channel (LWC) was disabled due to the removal of its photomultiplier tube (PMT). Consequently, the signals recorded for the LWC contain either zero or pure noise after that date. Also, starting on 20070522, the LWC was populated with data from the T2 channel as a result of a slight reconfiguration of the data acquisition system. On 4 March 2008 The LW channel photomultiplier tube was reinstalled in the Raman lidar. Effective 0000 UTC on 5 March 2008 the LW channel began producing valid liquid water data once again. |
Measurements: | sgprlC1.a0:
|