Phase imaging by spatial wavefront sampling
نویسندگان
چکیده
منابع مشابه
Acoustic Imaging by Wavefront Reconstruction
A reconstruction of the ultrasonic scattered fields in the zone near the scatter constitutes an image of the scatterer or flaw. In a real case the reconstruction zone may contain more than one distinct scatterer and accordingly the entire group form the image. At a remote location the scattered fields form a complicated diffraction pattern which will yield the image if operated on by a suitable...
متن کاملThe effect of detector sampling in wavefront-coded imaging systems
We present a comprehensive study of the effect of detector sampling on wavefront-coded systems. Two important results are obtained: the spurious response ratios are reduced in wavefront-coded systems with a cubic phase mask and detector sampling does not compromise the restoration of wavefront-coded images with extended depth of field. Rigorous computer simulation of sampled wavefront-coded ima...
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بیمه گران همیشه بابت خسارات بیمه نامه های تحت پوشش خود نگران بوده و روش هایی را جستجو می کنند که بتوانند داده های خسارات گذشته را با هدف اتخاذ یک تصمیم بهینه مدل بندی نمایند. در این پژوهش توزیع های فیزتایپ در مدل بندی داده های خسارات معرفی شده که شامل استنباط آماری مربوطه و استفاده از الگوریتم em در برآورد پارامترهای توزیع است. در پایان امکان استفاده از این توزیع در مدل بندی داده های گروه بندی ...
Measuring spatial coherence by using a reversed-wavefront Young interferometer.
A very simple optical setup for the measurement of the modulus and the phase of the two-point correlation function of a partially coherent light field is presented. The system consists of a slightly modified version of a Young interferometer and requires a single Young mask in order to determine the correlation function at any pairs of points. Experimental results are presented for the case of ...
متن کاملAcoustic Imaging and Image Processing by Wavefront Reconstruction Techniques
Acoustic imaging may be accomplished by a process involving the measurement of the amplitude and phase of the wavefront at a remote region and then the reconstruction, using mathematical techniques, of the fields at or near the scattering region. Since the system is coherent, both amplitude and phase images may be obtained. The current system under study employs pulsed CW tone bursts in order t...
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ژورنال
عنوان ژورنال: Optica
سال: 2018
ISSN: 2334-2536
DOI: 10.1364/optica.5.000164