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Multiwave Lidar for Atmosphere Monitoring

#0328


Creation of a Multiwave Lidar for Atmospheric Pollution Monitoring.

Tech Area / Field

  • ENV-MIN/Monitoring and Instrumentation/Environment

Status
3 Approved without Funding

Registration date
04.01.1995

Leading Institute
TRINITI, Russia, Moscow reg., Troitsk

Supporting institutes

  • NIIEFA Efremov, Russia, St Petersburg\nNIIPP, Russia, Moscow\nNPO Cosmos, Russia, Moscow

Project summary

The objective of this project is to create a multiwave lidar for inviromental monitoring in real-time scale near plants and industrial installations.

The environmental conditions deteriorated as a result of the development of industry and transport require urgent creation of systems for atmosphere pollution monitoring.

Most of the current environmental instruments for detection and monitoring of air pollutants are based on gas chromatography, mass spectrometry or infrared technology. Products represented by these technologies have limitations, not the least of which is that they are source or site specific.

As a result, optical remote sensing (ORS) technologies are gaining great attention. ORS system has unique capabilities that exceed current environmental instrumentations, such as:

- Wide area coverage - capable of making measurements out to 1 km.

- Near real-time results - capable of providing analysis within 2 minutes.

- Fugitive emission and fence-line monitoring.

- Selectivity and sensitivity.

One of the most effective ORS instruments for detection vari-ous type harmful impurities, and measurement of their concentra-tion is a lidar, an acronym for light detection and ranging, and specifically a luiar of differential absorbtion. In this lidar two laser pulses of different wavelengths are sent into the atmosphere, one wavelength being highly absorbed by a specific pollutant and the other one is used as reference. By measuring the difference between both backscattered intensities as a func-tion of time, the concentration of the detected pollutant is monitored range-resolved.

Most of the gas air pollutants have intensive absorption lines in near and average infrared range of spectrum (2-20 mm). The progress of a differential abortion lidar method is mainly determined by creation of an effective source of laser radiation in this range of spectrum.

Requirement for these lasers are easy to formulate: high and stable power-generation parameters, proper wavelongth and tunability in this range of spectrum, small weight and dimensions.

The most sutable are molecular gas lasers, and especially TEA CO2-lasers (wavelength range 9-10 mm).

The objective of this project is to create a lidar based on an optically pumped NH3-laser. This not only expands the genera-tion wavelength range (up to 14 (mm), but also grants new opportu-nities. At a sufficiently powerful pumping power with a nonselective resonator more than 20 wave- lengths in the range of 12-14 mm can be generated simultaneously. This permits one to monitor simultaneously several impurities in a real-time scale at dis-tances out to 1 km.

It should also be noted , that by appropriaty choosing the pumping CO2-plaser resonator scheme, this lidar can generate two wavelengths in the 9-11 mn range without wavelength convertion in ammonia thus the 9-14 mm spectrum range can be overlapped.

Battelle Memorial Institute and Lawrence Livermore National Laboratory are very interested in the results of the proposed work and are willing to serve as Partners to the Troitsk Research Institute for this work. The US EPA and DOE are also particularly interested in a lidar system with the proposed capabilities.


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