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.
References in periodicals archive ?
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.