coherence area

coherence area

[kō′hir·əns ‚er·ē·ə]
(optics)
A quantitative measure of the spatial coherence of a light beam, equal to the largest cross-sectional area such that light passing through any two pinholes placed in this area will produce interference fringes.
References in periodicals archive ?
This technique can clarify the low coherence area due to the terrain change by improving coherence in the unchanged area.
Typical coherence areas calculated by coherence function as plotted in Figure 9 are elliptical and decrease with frequency.
Interferometric phase will only present useful information in high coherence areas between both ISAR images.