保时捷汽车公司介绍.ppt

An atmospheric imaging is unavoidable for the optical systems,such as鼹tcm钯 remote sensing,navigation mapping and radar imaging,working under the environment of atmospheric monly,the angular resolution of the optical system is decided by the diffraction limitation of the pupil(A/D).However,the angular resolution of the atmospheric imaging systems is mostly limited by the coherence length (x/ro)which is ordinarily smaller than the pupil a rule,the angular
resolution of the long-time exposal imaging of the big-aperture systems is only equal to which of a aperture telesc;o, resolve the problem,an adaptive optics system (AOI)is AO technology can be subtle tO the wave矗ont aberrance caused
by atmospheric distortion,the fluctuation of the environment temperature
allows to perform a real—time correction through adjusting the optical system,which makes the large telescope equipped with AO offer high resolution to the diffraction limitation.
It is great,however,that a wavefront dislocation influences more accurate reconstruction of the aberrant wavefront with AO,when a beam is propagating in atmospheric same time,there is atmospheric anisoplanatic very small field of view ffov),ordinarily it is about several a麒:secondS,characterized
by the isoplanatic angle remains a serious limitation,if k∞ping high resolution imaging with when the observed target slightly deviates the light axis,the resolution begins to degrade will deteriorate the A0 performance severely,limit application extension ofAO systems consumedly.
To attain more large FOV of high resolution imaging,a new correcting way, named dual·conjugate adaptive optics(DCA0),is adopted,which is a simple system of multi-conjugate adaptive optics(MCAO)belonging to the category of base
theory of the MCAO system is that the atmospheric turbulence is divided into lots of layers,and a deformable mirror pM)is displayed the conjugate