TWP/MPL/C2 - Optical throughput unacceptable

The optical throughput of the MPL at Nauru is below an acceptable level. Despite an 
extended stay to address the problem in Feb 2003, the problem was unresolved.  An additional 
repair was attempted in July 2003 with no significant success.  Several optical components 
were replaced and the system was repeatedly re-aligned.  

The system appears to have been properly collimated as the shape of the signal is 
appropriate for both near and far range.  The magnitude of the signal was simply too low.  This 
signal decrease was apparent in ambient background values as well as from atmospheric 
signal, so the impact on data quality was not as severe as might otherwise be the case.  The 
MPL was still capable of detecting high altitude cirrus (day and night) but the 
sensitivity was reduced.

• detector_counts

• Raw data stream - documentation not supported

TWP/MPL/C2 - Detector on instrument failed.

The detector on the MPL failed. The result are zeros for the detector counts data.

• detector_counts

• Raw data stream - documentation not supported

TWP/MPL/C2 - Missing data

The MPL was turned off due to a dead detector.

• time
• range_bin_time
• total_counts
• pulse_rep
• voltage_05
• energy_monitor
• lon
• transceiver_altitude_angle
• base_time
• range_offset
• detector_counts
• Preliminary cloud base height above ground level(preliminary_cbh)
• property
• alt
• assumed_zero_range_bin
• laser_temp
• shots_summed
• scalar_sync_offset
• shots_sum
• instrument_temp
• background_signal
• time_offset
• range
• Pressure, associated geometric height, at altitude, NGM model output(height)
• lat
• voltage_15
• Backscatter(backscatter)
• voltage_10
• range_bin_width
• filter_temp
• laser_scalar_sync_offset
• trigger_freq
• max_altitude
• transceiver_azimuth_angle
• detector_temp
• laser_sync_offset
• range_bins
• deadtime_correction

• Raw data stream - documentation not supported