Optical Remote
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The
Area Detection System developed and tested for the Air Force by
GTE/EOO, was a CO2 Laser Differential
Absorption LIDAR for the remote detection and mapping of chemical
warfare agents in the atmosphere. EOO built and owns a van mounted
version of the system, which can be transported to remote test sites
for different customer's use. OPTICAL BTU SENSOR
EOO
has been exploring the use of an infrared absorption spectrometer and a
Raman scattering adjunct for the measurement of the BTU content and
constituents of natural gas. These parameters are useful for optimizing
burning efficiency and minimizing pollution as well as other process
controls in the natural gas industry. This concept, when fully
developed, could provide EOO a commercial product with medium to high
volume production requirements. 
This
prototype unit was the basis for the Gas Laser System (GLS) recently
delivered by EOO to the University of Cairo for air pollution studies.
It can randomly select one of up to 60 CO2
laser lines on any given pulse which can then be used in differential
absorption measurements to identify and measure the concentration of
more than 50 airborne pollutant molecules. The GLS-1 equipment includes
a scanner to provide hemispherical coverage with pointing and tracking
capability. This system will eventually be mounted in a self contained
transportable container so that the system can be quickly moved from
one test site to another. EYE-SAFE WIND PROFILE LIDAR
Wind profiling by Doppler LIDAR has been
shown to be feasible, but systems that are reliable, affordable, and
suitable for automatic unattended operation are not yet available. EOO
has developed wind sensor technology to make Doppler LIDAR measurements
using an innovative combination of two proven technologies:
- a Fabry-Perot, edge filter, direct detection technique which has been shown to be an efficient way to obtain atmospheric wind profiles from the time resolved Doppler shifted backscatter of a pulsed laser, as compared with heterodyne alternatives.
- a pseudo-random coding technique which permits an atmospheric aerosol scattering profile to be retrieved from the modulated return of a small, eye-safe, and inexpensive CW laser transmitter in the LIDAR.
BIOLOGICAL AGENT SENSOR
As became clear during and after the
Gulf War, chemical and biological (chem/bio) weapons are a great threat
to both civilians and armed forces. Remote sensing instruments need
improvement to detect and warn of chem/bio threats. EOO, with DARPA
support and SRI International as a subcontractor, is developing a LIDAR
sensor for an unmanned aerial vehicle (UAV) for large area surveillance
of bio threats. The optical hybrid sensor will make three separate
measurements: 1) aerosol spatial distributions by laser backscatter in
the near IR, 2) precise wind speed at the aerosol cloud location, and
3) bio material detection by fluorescent scattering in the UV. Our
baseline approach is to use a diode-pumped YAG laser as the transmitter
for a 1.06-mm aerosol LIDAR and wind sensor
and a 266-nm based fluorosensor, designed to size, weight, and cost for
the tactical UAV. The simple, low-cost EOO concept brings the sensor to
the threat, is capable of multiple look angles for better spatial
characterization of the cloud, and performs well in complex terrain.
The brassboard has been fabricated and recently ground tested at Dugway
Proving Grounds in Utah. Data analyses and additional testing aboard a
Queen Air are planned for later in CY98 or early CY99. Prototype
development will follow during the next year and a half with
appropriate sponsorship. For More Information, you may contact Dan Radecki at:
269 N. Mathilda Drive
Sunnyvale, CA 94086
Phone: (408) 738-5393
Fax: (408) 738-5399
E-mail: info@eooinc.com