Subject: | NSA/MPL/C1 - Laser Q-Switch Problem |
DataStreams: | nsamplC1.00, nsamplC1.a1, nsamplcmask1clothC1.c1, nsamplpsC1.a0, nsamplsmask1clothC1.c1
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Description: | At about 22:52 UTC on 2004/01/19, the NSA MPL appears to have suffered a temporary failure
of the laser Q-Switch. This results in a complete loss of lidar data immediately
thereafter. The problem was resolved (at least for the time being) by disconnecting and
reconnecting the Q-Switch cable on 2004/01/24 at about 00:16 UTC. Data after this time appears
good. |
Measurements: | nsamplpsC1.a0: - Voltage level which operates the thermistor(voltage_10)
- Distance from leading edge of first range bin to the center of each bin .(range_bins)
- Maximum altitude retrieved from multichannel scalar card.(max_altitude)
- range(range)
- Laser output energy per pulse(energy_monitor)
- Array of heights for the range gates(height)
- base time(base_time)
- effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
- Number of laser shots recorded(shots_summed)
- Instrument Temperature(instrument_temp)
- Background Signal(background_signal)
- Filter Temperature(filter_temp)
- lon(lon)
- time(time)
- Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
- Voltage level which operates the A/D card and the detector(voltage_05)
- Detector Temperature(detector_temp)
- Laser Temperature(laser_temp)
- Voltage level which operates the energy monitor(voltage_15)
- Preliminary cloud base height(preliminary_cbh)
- Attenuated backscatter(detector_counts)
- Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
- lat(lat)
- Time offset of tweaks from base_time(time_offset)
- Width of range-bins calculated from range_bin_time(range_bin_width)
- Dummy altitude for Zeb(alt)
nsamplsmask1clothC1.c1: - MPL Cloth et al. Algorithm Significance Mask(SigniMaskMplCloth)
- Height of Center of Each Range Bin(Heights)
- base time(base_time)
- Time offset of tweaks from base_time(time_offset)
nsamplC1.00: - null(Raw data stream - documentation not supported)
nsamplcmask1clothC1.c1: - MPL Cloth et al. Algorithm Cloud Mask(CloudMaskMplCloth)
- base time(base_time)
- Height of Center of Each Range Bin(Heights)
- Time offset of tweaks from base_time(time_offset)
nsamplC1.a1: - required to correct raw counts for detector deadtime prior to all other
corrections.(deadtime_correction) - Number of laser pulses summed during measurement interval(shots_sum)
- Distance from leading edge of first range bin to the center of each bin .(range_bins)
- Voltage level which operates the A/D card and the detector(voltage_05)
- value represents date of last configuration change as yyyymmdd(property)
- Array of heights for the range gates(height)
- lat(lat)
- Repetition rate, or Trigger Frequency of the laser(trigger_freq)
- Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
- Detector Temperature(detector_temp)
- Dummy altitude for Zeb(alt)
- Sum of raw backscatter counts per bin prior to ANY corrections.(total_counts)
- Instrument Temperature(instrument_temp)
- Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
- lon(lon)
- range(range)
- Angle of orientation with respect to true geographic north(transceiver_azimuth_angle)
- Amount of time the actual laser pulse lags behind the sync trigger(laser_sync_offset)
- Number of laser shots recorded(shots_summed)
- base time(base_time)
- Background Signal(background_signal)
- Amount of time the scalar lags behind the sync trigger(scalar_sync_offset)
- Aerosol backscatter coefficient at 355 nm(backscatter)
- Maximum altitude retrieved from multichannel scalar card.(max_altitude)
- Laser Temperature(laser_temp)
- Preliminary cloud base height(preliminary_cbh)
- time(time)
- Time offset of tweaks from base_time(time_offset)
- effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
- Voltage level which operates the energy monitor(voltage_15)
- Voltage level which operates the thermistor(voltage_10)
- Amount of time laser pulse lags behind the scalar trigger(laser_scalar_sync_offset)
- Filter Temperature(filter_temp)
- Width of range-bins calculated from range_bin_time(range_bin_width)
- Laser output energy per pulse(energy_monitor)
- Angle of inclination with respect to horizontal(transceiver_altitude_angle)
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