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Constraints On The Size And Shape Of The Receiving Aperture in a phase/doppler system
Author(s) -
Naqwi Amir A.,
Durst Franz
Publication year - 1990
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19900070121
Subject(s) - aperture (computer memory) , doppler effect , phase (matter) , optics , signal (programming language) , limit (mathematics) , scattering , computation , mie scattering , particle size , physics , monotonic function , light scattering , mathematics , acoustics , computer science , mathematical analysis , chemistry , algorithm , quantum mechanics , astronomy , programming language
Abstract Using computations based on Mie scattering theory, the influence of the size and shape of the receiving aperture on the signal properties of a phase/Doppler system is examined. For circular apertures exceeding a certain size limit, it is shown that the signal phase is non‐monotonic with respect to the particle diameter and exhibits abrupt changes of 180° at certain values of the diameter. This difficulty may be overcome by using rectangular apertures with appropriate aspect ratios.