NDLI: Automated lidar transmitter for multiparameter investigations within the Arctic atmosphere

Content Provider	IEEE Xplore Digital Library
Author	Fiedler, J. von Cossart, G.
Copyright Year	1980
Abstract	The transmitter system of the ALOMAR Rayleigh/Mie/Raman lidar (RMR lidar), part of the ALOMAR facility at the island Andoya (69/spl deg/N, 16/spl deg/E) in Northern Norway, is presented. Long-term and multiparameter observations of the Arctic middle atmosphere on a climatological basis require a complex and automated transmitter system. To obtain winds using the Doppler method, two identical power systems driven by one single seeder system have been chosen. The seeder frequency is actively stabilized against an iodine absorption line with remaining fluctuations of less than 10/sup -8/. Each power system can be used with its own steerable receiving telescope, moveable in elevation as well as azimuth. Using both systems in alternating operation on a pulse-by-pulse basis of the lasers, two wind components can be obtained simultaneously. Trends in the power laser beam positions are corrected by a direction control system leading to fixed axes of the laser beams before transmission into the atmosphere. The achieved beam pointing stability at the original beam diameter is better than /spl plusmn/20 /spl mu/rad, which guarantees the beam to remain inside the very narrow field-of-view (FOV) of the receiving telescope and supports full daylight capability of the lidar. The whole transmitter system is controlled by computers, thus avoiding optical adjustments for months.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	748
Ending Page	755
Page Count	8
File Size	188566
File Format	PDF
ISSN	01962892
Volume Number	37
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laser radar Optical transmitters Laser beams Atmosphere Pulse power systems Telescopes Power lasers Optical control Control systems Optical computing
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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