obliquity factor

obliquity factor

[ə′blik·wəd·ē ‚fak·tər]
(optics)
A function which is proportional to the amplitudes of secondary waves propagating in various directions according to Huygens' principle; it is 1 + cos θ, where θ is the angle between the normal to the original wavefront and the normal to the secondary wavefront.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The impulse response function h depends on time t, spatial coordinates of the point P(x,y,z), where this function is calculated, the sound velocity c in a medium, the obliquity factor [beta](z,t) corresponding to the transducer boundary conditions and the angle [OMEGA](P',t), subtended at the point P' (Fig.
The rigid baffle obliquity factor [beta](z,t) = 2 was used in transducer T simulations.
The obliquity factors [beta](z,t) are given in the time domain (2)
Appendixes provide further information on Maxwell's equations, polarization theory, complex-variable algebra, complex reflection coefficients and multipath effects, radomes, far-zone range-approximation and phase error, radiating near and far fields and the obliquity factor, path length differences from a planar aperture, and effects of random aperture phase errors.