Coherent, CW, pseudo random code modulated lidar for path resolved optical remote sensing
- Oregon Graduate Inst. of Science and Technology, Portland, OR (United States). Dept. of Electrical Engineering and Applied Physics
An innovative, coherent, cw lidar has been developed that allows path resolved measurements of the received intensity from a continuous wave laser beam backscattered from atmospheric aerosols. The use of a cw transmitter allows for a relatively simple and compact system and minimizes problems with frequency stability of the source. In order to achieve path resolved measurements, the cw laser transmitter is optically, di-phase modulated with a pseudo random code. This allows, with proper signal processing, for separation of the signals created by light scattered from different parts of the path. The range resolution that can be achieved is controlled by the basic pulse width of the pseudo random code and can easily be changed. The current system has a 150-meter full width-half maximum range bin size. The maximum range that can be probed depends on the aerosol backscatter coefficient, transmitter power and the size of the transmit/receive optics. The current system can work out to about 800 meters and needs only 100 milliseconds of data. Potential applications include optical remote sensing of winds, turbulence, chemical species (using DIAL) and perhaps temperature and pressure.
- OSTI ID:
- 231043
- Report Number(s):
- CONF-940449-; ISBN 0-8194-1526-X; TRN: IM9623%%353
- Resource Relation:
- Conference: Society of Photo-Optical Instrumentation Engineers conference on intelligent information systems, Orlando, FL (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Atmospheric propagation and remote sensing 3; Flood, W.A.; Miller, W.B. [eds.]; PB: 947 p.; Proceedings/SPIE, Volume 2222
- Country of Publication:
- United States
- Language:
- English
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