Airborne lidar system with variable-field-of-view receiver for water optical properties measurement

Viktor I. Feygels; Yuri I. Kopilevich; Alexey I. Surkov; James K. Yungel; Michael J. Behrenfeld

doi:10.1117/12.506976

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5 November 2003 Airborne lidar system with variable-field-of-view receiver for water optical properties measurement

Viktor I. Feygels, Yuri I. Kopilevich, Alexey I. Surkov, James K. Yungel, Michael J. Behrenfeld

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Proceedings Volume 5155, Ocean Remote Sensing and Imaging II; (2003) https://doi.org/10.1117/12.506976
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

The shape of signal from sea water column obtained with an oceanographic lidar is not sufficient to pick out a contribution from a separate physical characteristic of the water. A possible approach consists in compensating the deficiency in information obtained from return signal of traditional depth-sounding lidar by using a variable field-of-view (FOV) receiver which register simultaneously (or subsequently) return signals obtained with several different FOVs. The proposed method calls for at least three FOV angles to be involved - a narrow one (approximately equal to lidar transmitter (laser beam) divergence), a wide (FOV plane angle of 50-70 mrad), and an intermediate (the angle of the order of 15-25 mrad). The approach is based on the fact that the effective system attenuation coefficients, Kn, Kw, and Ki, derived from the slopes of backscatter return variations with depth for the narrow-, the wide-, and the intermediate-FOV receiver correspondingly, are different functions of seawater IOPs. The functions are established theoretically using a sophisticated model of lidar return that allows for a wide variety of shapes of the volume scattering function; a characteristic of the actual VSF shape (for forward scattering) is to be determined, in parallel with IOP estimates, from the recorded lidar waveforms. It seems to be of significance that a system to realize the proposed method may be created on the base of an existing hydrographic (bathymetric) lidar with only a simple enough modification of basic optical scheme.

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Viktor I. Feygels, Yuri I. Kopilevich, Alexey I. Surkov, James K. Yungel, and Michael J. Behrenfeld "Airborne lidar system with variable-field-of-view receiver for water optical properties measurement", Proc. SPIE 5155, Ocean Remote Sensing and Imaging II, (5 November 2003); https://doi.org/10.1117/12.506976

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