Abstract

ABSTRACT The theoretical description of incoherent source imaging through an extended turbulent medium is considered.It is demonstrated that the temporal-spatial power spectra of the defocused images contain information about thetransverse wind velocity and the refractive turbulence strength along an optical path. The information about windand turbulence profiles can be recovered from these spectra using a class of quasi one-dimensional natural sources,and a spatial filter in the aperture plane. 1. INTRODUCTION In 1974, Lee1 proposed using spatially filtered optical element to make localized measurements of refractiveturbulence. This technique was investigated in detail by Churnside e al.2 It requires a spatial filter at each end ofthe propagation path, which makes this technique inconvenient for vertical profiling. A point source (e.g.,a star)and a spatially filtered receiver can be used to obtain vertical profiles,3'4 but the longitudinal resolution is poorbecause the transmitter, in this case the star, is not spatially filtered. For a point source or turbulent medium thatis moving, the spatial resolution of the profiles increases.5'6 Churnside e al.7 proposed using a second spatial filterat the receiver and an arbitrary transmitter to obtain turbulence profiles at high spatial resolution.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.