Transcript Current Lidar Activities at ETL

Current Lidar Activities at ETL
Mike Hardesty and Alan Brewer
NOAA Environmental Technology Laboratory
11-Apr-16
Working Group on Spacebased Lidar Winds
Overview of Topics
• Fine structures of moisture transport measured
during IHOP
• Lidar upgrades and deployments for current field
experiments
• NOAA G-4 Doppler lidar
11-Apr-16
Working Group on Spacebased Lidar Winds
IHOP Horizontal Winds: 9 June
270 km
Forecast showed low
level jet
11-Apr-16
Flight track to measure jet
Working Group on Spacebased Lidar Winds
Northern leg wind and water vapor
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Working Group on Spacebased Lidar Winds
Lidar and dropsonde flux comparison
DIAL/Doppler lidar
Dropsonde (~50 km spacing)
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Working Group on Spacebased Lidar Winds
Fine Scale Transport 1809 m ASL
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Working Group on Spacebased Lidar Winds
Fine Scale Transport 2309 m ASL
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Working Group on Spacebased Lidar Winds
Fine Scale Transport 2589 m ASL
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Working Group on Spacebased Lidar Winds
Average Moisture flux versus height
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Working Group on Spacebased Lidar Winds
Northern Leg vq Cospectrum
150 km
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15 km
Working Group on Spacebased Lidar Winds
Current Lidar Activities
• New England Air Quality (ship)
– Wind profiler and Doppler lidar to
characterize winds down to the
surface
– Cloud radar/radiometer to
measure cloud properties
– Aerosol/ozone lidar to detect
layering
– Air/sea flux measurements
• New England Air Quality (plane)
– Airborne ozone/aerosol lidar
– Dropsondes
• Key West Air Sea Interaction
study
– MOPA CO2 Doppler lidar on
Navy ship
11-Apr-16
Working Group on Spacebased Lidar Winds
High Resolution lidar 2003/2004 Upgrades
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Reconfigured optical system to
incorporate a fiber coupled receiver
detector.
Implemented a PZT controlled variable
coupler to regulate amount of LO power
mixing with return signal.
Simplified transmit/receive paths.
Completely re-designed receiver
detector circuitry to be compatible with
fiber receiver.
Frequency monitor information now
extracted from receiver detector signal.
Implemented an improved PoundDrever/Hall circuit board (for locking
cavity to seed light).
Developed &implemented new motioncompensation control algorithms.
– Correction to 0.3 degree rms
– Fully removes linear velocities
11-Apr-16
Working Group on Spacebased Lidar Winds
MOPA CO2 Doppler Upgrades
• Implemented C12O18
isotope
– Resonances in
backscatter for some
sulfates
– Eliminates CO2
absorption
– Reduced H2O
continuum absorption
• Two identical master
oscillator paths for DIAL
measurements
• Range has doubled,
often to 15 km with 1.3
mJ
11-Apr-16
½ wave
Shutters
12 Pass

AOM1
AOM2
Pol BS

CW Lasers
Local
Oscillator
RF Discharge Optical Amplifiers
Cooled
Detector
1/4 wave
6 Pass
Pol BS
Working Group on Spacebased Lidar Winds
8 “ Off Axis Parabolic Telescope
NOAA G-IV Instrumentation Upgrades
Contact Point: Alan S. Goldstein – NOAA/Aircraft Operations Center
11-Apr-16
Working Group on Spacebased Lidar Winds
Mission Needs
• The next generation of NWS numerical prediction models is
the Weather Research and Forecasting (WRF) system. The
WRF for hurricanes (HWRF) will be an advanced modeling
system to forecast track, intensity and rainfall.
• NWS held a workshop in May 2002 to identify data required
by HWRF. The results of this workshop were used to
generate a preliminary instrumentation and modification plan.
• Discussions with NCEP/Environmental Modeling Center,
NCEP/National Hurricane Center and OS/Operations and
Requirements Division have refined the measurement
requirements and corresponding instrumentation proposal.
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Working Group on Spacebased Lidar Winds
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HWRF Workshop List
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3D Winds – Critical for Model Initialization
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Ocean Temperature and Heat Content * |
For Model
Vertical Temperature Profiles
| Verification
Vertical Moisture Profiles
| (May be needed
Ocean Waves *
_| for initialization)
Microphysics/Rain
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Ocean Currents
| For Model
Radiation
| Verification
* Supports current NHC forecasting
11-Apr-16
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Working Group on Spacebased Lidar Winds
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Look angles and wind products
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Working Group on Spacebased Lidar Winds
2-d Winds in each plane
Mean Wind
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Working Group on Spacebased Lidar Winds
Components
Spec
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Value
Notes
Measurement rate:
2 seconds per look angle
Includes integration time and articulation
Measurement spatial resolution:
1 km
LOS
Look directions:
4 or 6 points / 2 or 3 planes
0, +/-5 deg (elevation). Fore and aft (45 deg)
Laser wavelength:
355 nm
Laser power:
12 watts
Laser rep rate:
Laser
Eye safety
– Diode pumpedMeasurement
tripled
Nd:YAG
accuracy:
Telescope type:
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Telescope aperture:
Receiver
Telescope field of view:
– Direct detection
< 1 m/s from 0 – 15 km
HOE Telescope/Scanner
18 cm (30 cm)
.2 mrad
1.6 cm
Number of orders:
5
Heat Rejection
Free spectral range:
Dynamic
range:
– Cooling Loop to
external
radiator
.3125 cm-1
1644 m/s/order
Etalon plate diameter:
6 cm
Etalon clear aperture:
4.2 cm
Telescope/ScannerEtalon reflectivity:
– HOE scanner (Schwemmer)
Etalon flatness:
Number of CCD channels:
Integration/Products
Transmission to interferometer input:
– NOAA/ETL Overall transmission:
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Eye safe
Etalon gap:
Etalon absorpotion:
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50 Hz diode pumped
70%
Lambda / 150
@ 633 nm
<1%
283
41%
17%
Recycling configuration
3
Operation:
Autonomous with scripting
Working Group on Spacebased Lidar Winds
Interior view
11-Apr-16
Working Group on Spacebased Lidar Winds
Expected Performance
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Time resolution
2 secs
Along beam spatial
resolution
1 km
4 point scan
6 point scan
8 secs
12 secs
Wind profile flight path
spatial scale
2 km to 3 km
Working Group on Spacebased Lidar Winds
Timeline
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April 04
– Paperwork into purchasing
– NASA MOU paperwork into system
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Sep 04 – Orders placed
July – Sept 05 Delivery of major components
Sept – Nov 05 Assemble Lidar system
Nov 05 - Lab testing entire system
Dec 05 - Initial upload of Lidar into G4
Winter Storm Season 06 - testing Lidar systems
Hurricane Season 06 – Initial deployment G4 Doppler Lidar
11-Apr-16
Working Group on Spacebased Lidar Winds
What’s next
• IHOP
– Compare observed transport with model estimates
– Complete investigation of vertical velocity fluctuations
• Solid state Doppler lidar
– Tropical cumulus experiment (NOAA ship) 2005
– Fly on NOAA Twin Otter (2005)
– Co-deploy with airborne ozone lidar in Texas (2006)
• Dual wavelength CO2 MOPA lidar
– DIAL experiments to measure hydrocarbons
11-Apr-16
Working Group on Spacebased Lidar Winds