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Modulated Sine Waves for Differential Absorption Measurements Using a CW Laser System
- Publication Year :
- 2015
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 2015.
-
Abstract
- A continuous wave Light Detection and Ranging (CW LiDAR) system utilizes two or more laser frequencies and time or range shifted pseudorandom noise (PN) codes to discriminate between the laser frequencies. The performance of these codes can be improved by subtracting out the bias before processing. The CW LiDAR system may be mounted to an artificial satellite orbiting the earth, and the relative strength of the return signal for each frequency can be utilized to determine the concentration of selected gases or other substances in the atmosphere.
- Subjects :
- Lasers And Masers
Subjects
Details
- Language :
- English
- Database :
- NASA Technical Reports
- Publication Type :
- Report
- Accession number :
- edsnas.20150016921
- Document Type :
- Report