30 April 1982 Design And Calibration Of A Coherent Lidar For Measurement Of Atmospheric Backscatter
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Abstract
This paper presents a discussion of the background requirements for, and the design and calibration of a coherent Doppler lidar which is oriented specifically toward the measurement of low values of atmospheric backscatter, β (π), at a wavelength of 10.6μm. The lidar to be described is a compact, continuous wave system which can operate in two modes--multiple particle scattering and single particle scattering. In the multiple scattering mode, the lidar employs an extended focal volume and utilizes a technique similar to Dicke switching to achieve measurement of the volume backscatter. In the single scattering mode, the focal volume is reduced to ensure a high probability of single particle scattering. Measure-ment of the single particle backscatter as a function of time leads to the formation of signal histogram from which the volume backscatter can be inferred. In addition to providing the atmospheric backscatter value, appropriate data processing algorithms and focal volume calibration allow the single particle mode to yield information on the atmospheric aerosol scattering cross-section distribution. The system hardware and signal processing are described in this paper along with the algorithms used to calculate the backscatter, (7). Calibration techniques described include the use of known targets such as spinning disks and wires.
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W. D. Jones, W. D. Jones, J. W. Bilbro, J. W. Bilbro, S. C. Johnson, S. C. Johnson, H. B. Jeffreys, H. B. Jeffreys, L. Z. Kennedy, L. Z. Kennedy, R . W. Lee, R . W. Lee, C. A. DiMarzio, C. A. DiMarzio, "Design And Calibration Of A Coherent Lidar For Measurement Of Atmospheric Backscatter", Proc. SPIE 0300, Physics and Technology of Coherent Infrared Radar I, (30 April 1982); doi: 10.1117/12.932578; https://doi.org/10.1117/12.932578
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