Coherent, CW, pseudo-random code-modulated lidar for path-resolved optical remote sensing

J. Fred Holmes; Badih John Rask

doi:10.1117/12.177994

29 June 1994 Coherent, cw, pseudo-random-code-modulated lidar for path-resolved optical remote sensing

J. Fred Holmes, Badih John Rask

Proceedings Volume 2222, Atmospheric Propagation and Remote Sensing III; (1994) https://doi.org/10.1117/12.177994
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

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.

Citation Download Citation

J. Fred Holmes and Badih John Rask "Coherent, cw, pseudo-random-code-modulated lidar for path-resolved optical remote sensing", Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994); https://doi.org/10.1117/12.177994

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