Correction of Doppler-broadened Rayleigh backscattering effects in H2O dial measurements
Abstract
A general method of solutions for treating effects of Doppler-broadened Rayleigh backscattering in H2O Differential Absorption Lidar (DIAL) measurements are described and discussed. Errors in vertical DIAL measuremtns caused by this laser line broadening effect can be very large and, therfore, this effect has to be accounted for accurately. To analyze and correct effects of Doppler-broadened Rayleigh backscattering in DIAL experiments, a generalized DIAL approximation was derived starting from a lidar equation, which includes Doppler broadening. To evaluate the accuracy of H2O DIAL measurements, computer simulations were performed. It was concluded that correction of Doppler broadened Rayleigh backscattering is possible with good accuracy in most cases of tropospheric H2O DIAL measurements, but great care has to be taken when layers with steep gradients of Mie backscattering like clouds or inversion layers are present.
- Publication:
-
In NASA. Langley Research Center 13th International Laser Radar Conference 3 p (SEE N87-10263 01-35
- Pub Date:
- August 1986
- Bibcode:
- 1986lara.confS....A
- Keywords:
-
- Backscattering;
- Boundary Value Problems;
- Doppler Effect;
- Optical Radar;
- Radar Measurement;
- Rayleigh Scattering;
- Approximation;
- Computerized Simulation;
- Extinction;
- Pressure Measurement;
- Temperature Measurement;
- Communications and Radar