The key issues in all areas of Differential Absorption Lidar (DIAL) data collection and analysis techniques were examined. This included consideration of the practical and theoretical limitations of DIAL and the range of possible DIAL measurements

Browell, E. V.

Woods, P. T.

English

NASA Technical Reports Server

N87-10281 ,
A
ASSESSMENT OF DIAL DATA COLLECTION AND
ANALYSIS TECHNIQUES
E. V. Browell a and P. T. Woods b
The First International DIAL Data Collection and
Analysis Workshop was held in Virginia Beach, Virginia, on
November 18-21, 1985. The objectives of the Workshop were to
assemble representatives from most of the leading DIAL groups
into a limited and focused working group and to address the
details of current and future DIAL data collection and analysis
techniques. The emphasis of the Workshop was on direct
detection DIAL methods and on an assessment of current
techniques used in DIAL measurements throughout the 0.2 - ll_m
spectral range. A total of 38 researchers from 22 DIAL groups
contributed to the Workshop. A list of the DIAL participants
in this Workshop is given by country and organization in Table
i. A NASA report is being prepared t_ communicate the Workshop
results to the entire DIAL community. This paper discusses
the Workshop and summarizes the Workshop's assessment of DIAL
data collection and analysis techniques.
The Workshop was organized to examine the key issues in
all areas of DIAL data collection and analysis techniques.
This included consideration of the practical and theoretical
limitations of DIAL and the range of possible DIAL measure-
ments. Table 2 lists the main topics discussed at the Workshop
and examples of issues addressed in each area. Each of the
DIAL groups represented at the Workshop presented a current
status of their DIAL research as it pertained to the topics of
the Workshop. A written summary of each report is found in the
appendix of Reference I. During the Workshop, each of the
topics identified in Table 2 was discussed initially by a panel
comprised of several of the DIAL participants and later by the
entire Workshop. Each panel chairman had the responsibility of
leading the Workshop discussion on a particular DIAL topic and
of drafting a section of the Workshop report. Each panel
report defined the issues to be considered, the various
approaches used to address each issue, and, where possible,
quantitativel[ compared competing techniques. The report from
this Workshop _ presents a comprehensive assessment of the major
DIAL techniques, and this paper summarizes the results of this
Workshop in each of the major topic areas.
• Browell, E. V., and P. T. Woods, eds.:
Data Collection and Analysis Techniques.
in preparation.
Assessment of DIAL
NASA Langley, work
a National Aeronautics and Space Administration, Langley
Research Center, Hampton, Virginia 23665, U.S.A.
b National Physical Laboratory, Teddington; Middlesex TWII
OLW, U.K.
49
https://ntrs.nasa.gov/search.jsp?R=19870000848 2020-03-23T14:42:42+00:00Z
Table i. DIAL Participants in the First International DIAL
Data Collection and Analysis Workshop
Sweden:
Japan:
France:
U.K.:
F.R.G. :
Italy:
Canada:
U.S.:
Lund Inst. of Tech. - K. Fredrikson
Kyushu Univ. - O. Uchino
NIES - N. Sugimoto
CNRS/Serv. Aeronomy _ G. Megie/J. Pelon
CNRS/Dynam. Meteor. - P. Flamant
Elect. Du. France - C. Cahen/B. Grossmann
NPL - P. T. Woods/B. W. Jolliffe/M. Milton
Univ. of Hull - B. J. Rye
CERL - R. H. Varey
Inst. for Physik - A. Breinig/W. Staehr
MPI fur Meteor. - J. Boesenberg
DFVLR - W. Renger
ENEL and CISE - A. Marzorati/E. Zanzottera
AES - R. M. Hoff/F. A. Froude
NOAA/WPL - R. M. Hardesty
EPA Las Vegas - M. Bristow/D. Bundy
SRI Inter. - R. E. Warren/J. G. Hawley
NASA GSFC - C. L. Korb/G. K. Schwemmer
RCA Astro. - A. Rosenberg/J. C. Petheram
JPL - W. B. Grant/S. McDermid
Univ. of MD - T. D. Wilkerson/C. Braun
NASA LaRC - E. V. Browell/S. Ismail/A. F.
Carter/R. J. Allen
5O
Table 2. DIAL Workshop Topics
I • Data Collection Techniques
Transmitting Systems
Atmospheric Effects
Receiving Systems
Detection Systems
Post-detection
Electronics
New Concepts
EXAMPLES OF ISSUES
Laser Requirements;
Simultaneous Versus Non-
simultaneous Outputs; Laser
Output Characterization;
Spectral Data
Speckle; Turbulence;
Wavelength-Dependent
Propagation Effects
Telescope Design; Coaxial;
Collinear
Linearity; Gain Modulation;
Noise Effects; Wavelength
Separation Techniques
Amplifier Saturation; Dynamic
Range Compression, Digitiza-
tion Speed; Accuracy
Limitations
II. Data Analysis
Signal Processing
Data Handling
Correction to
Results
Error Analysis
Averaging Techniques;
Smoothing; Differentiation
Parallel Processing; Computa-
tional Techniques
Wavelength Dependence of
Scattering; Correction for
Atmospheric Density;
Absorption Cross Sections;
Deconvolution of Laser
Spectral Properties
Contributions to Total Error
Budget
51


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