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The Mini-MOPA lidar is housed in a mobile laboratory constructed
from a modified sea-going cargo container.
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Mini-MOPA CO2 Doppler Lidar
Applications
- Boundary Layer Studies
- Wind profiles
- Turbulence and momentum flux measurements
- Profiles and flux measurements of water vapor and ozone (under development)
- Dual Doppler (future)
- Cloud Studies
- Cloud geometry
- Cloud microphysical parameters (particle size & concentration)
Field Projects
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July/August 2002 |
New Hampshire |
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September/October 2001 |
Tropical Eastern Pacific |
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September 2000 | New Hampshire |
- Ammonia DIAL Measurements
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March-May 2000 | Boulder, Colorado |
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June/July 1999 |
Nashville, Tennsessee |
- Table Mountain Doppler Experiment
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Nov. 1998 - Jan. 1999 |
Boulder, Colorado |
- CART (Cloud and Radiation Testbed)/
ARM (Atmospheric Radiation Measurement)
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April 1996 |
Ponca City, Oklahoma |
Basic Parameters Measured
- Range resolved radial velocity
- Range resolved backscatter intensity
- Dual wavelength differential absorption or backscatter (under development)
Typical Specifications:
| Wavelength |
9.2 - 11.3 µm line tunable
(Fully eye-safe) |
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| Pulse energy |
2 mJ |
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| Pulse rate |
< 300 Hz |
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| Pulse length |
0.5 - 10 µs |
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| Wavelength switching rate |
< 50 Hz |
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| Scan |
Upper hemisphere |
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| Resolution |
Range | Time |
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| > 60 m |
0.3 sec (100 pulse avg.) |
| Minimum range |
90 m |
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| Maximum range |
5 - 12 km |
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| Velocity accuracy |
> 5 cm s-1 |
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| Comments |
- Radio frequency discharge technology in CO2 lasers
decreases maintenance and increases lifetime.
- C13 isotope laser gas mix will extend wavelength tuning
range and decrease atmospheric CO2 absorption.
- We are currently modifying the instrument to operate at two
wavelengths for differential backscatter and absorption
measurements.
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References
Zhao, Y., "Line-pair selections for remote sensing of atmospheric ammonia
by use of a coherent CO2 differential absorption lidar system."
Applied Optics, 39(6):997-1007, 2000.
Brewer, W.A., and R.M. Hardesty, "Development of a dual-wavelength
CO2 mini-MOPA Doppler lidar." OSA Coherent Laser Radar,
Keystone, Colorado, 293-296, 1995.
Pearson, G.N., and B.J. Rye, "A high-pulse-repetition-frequency
CO2 Doppler lidar for atmospheric monitoring." Rev. Sci.
Instrum., 64, 1155-1157, 1993.
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