Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
03/09/2007 | 1615 | 03/23/2007 | 1310 | Does not affect quality |
Subject: | SGP/RL/C1 - Interference filter replaced temporarily |
DataStreams: | sgp10rlprofbe1turnC1.c0, sgp10rlprofdep1turnC1.c1, sgp10rlprofasr1ferrC1.c1, sgprlC1.00, sgp10rlprofbe1turnC1.c1, sgprlC1.a0, sgp10rlprofext1ferrC1.c1, sgp10rlprofmr1turnC1.c1 |
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. |
Suggestions: | |
Measurements: | sgp10rlprofext1ferrC1.c1: more
sgp10rlprofasr1ferrC1.c1: more sgp10rlprofmr1turnC1.c1: more sgprlC1.00: more sgprlC1.a0: more sgp10rlprofdep1turnC1.c1: more sgp10rlprofbe1turnC1.c0: more sgp10rlprofbe1turnC1.c1: more |