Optimized laser turrets for minimum phase distortion
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An analysis and computer program which optimizes laser turret geometry to obtain minimum phase distortion is described. Phase distortion due to compressible, inviscid flow over small perturbation laser turrets in subsonic or supersonic flow is calculated. The turret shape is determined by a two dimensional Fourier series; in a similar manner, the flow properties are given by a Fourier series. Phase distortion is calcualted for propagation at serveral combinations of elevation and azimuth angles. A sum is formed from the set of values, and this sum becomes the objective function for an optimization computer program. The shape of the turret is varied to provide minimum phase distortion.
SEE ParentDocumentRecord|Ntt=19800017091 "Proc. of the Aero-Optics Symp. on Electromagnetic Wave Propagation from Aircraft"; p. p 339-362
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Fuhs, A.E.; Fuhs, S.E. (1980-04);Analytical models for optical phase distortion due to compressible flow over a laser turret are developed. Phase distortion is calculated for both blunt and small perturbation turrets. For the blunt turret, the Janzen-Rayleigh ...
Fuhs, Allen E. (Monterey, California. Naval Postgraduate School, 1980-03); NPS-67-80-003Using the optical system equation, the impact of a change in wavelength is determined. The rms phase variation at output aperture is critical and must be reduced by an amount equivalent to reduction in wavelength. If turret ...
Fuhs, Allen E.; Huhs, Susan E. (Monterey, California. Naval Postgraduate School, 1976); NPS-69FU76101Compressible flow over a laser turret creates a phase distortion. To gain insight to this problem a model of a hemispherical turret is developed. The flow field is obtained using a second order solution based on Janzen-Rayleigh ...