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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
One-way ANOVA was used to evaluate effects of age group on dependent variables, that is, logarithmic coherence area estimates, frequency for peak beta coherence, summed EMG power, RMS error, and subject characteristics (MMSE score, height, weight, and body mass index (BMI)).
Estimates for coherence area in alpha, beta, and high and low beta bands are presented in Figure 6.
No significant effects of gender (all p > 0.2) or footedness (all p > 0.3) on beta band coherence area during dorsiflexion were present.
As we know the existing phase filtering algorithms faced three major difficulties: feature preserving in dense fringe, accurate phase estimate in low coherence area, and computing speed, to which various algorithms are proposed.
Moreover, nonlinear phase model has also a good fringe estimation capability in low coherence area due to the use of a larger estimation window.
And the unwrapping phase gradient based on nonlinear phase is obtained, still a more reliable unwrapping path and the gradient of integration phase are available at low coherence area.
This technique can clarify the low coherence area due to the terrain change by improving coherence in the unchanged area.
Associations between H-reflex modulation and coherence area within and across groups were assessed by means of the Pearson product-moment correlations.
We also investigated possible associations between the central common drive to the TA motoneuron pool (log TA-TA coherence area) and the ability to suppress the antagonist motoneuron pool (reduction in soleus H-reflex amplitude at the onset of DF compared to rest).
Typical coherence areas calculated by coherence function as plotted in Figure 9 are elliptical and decrease with frequency.
samples can be reduced at good coherence areas and enlarged at low coherence areas.
Interferometric phase will only present useful information in high coherence areas between both ISAR images.