convergence ratio

convergence ratio

[kən′vər·jəns ‚rā·shō]
(optics)
The ratio of the tangent of the angle between a meridional ray and the optical axis after it passes through an optical system to the tangent of the angle between the ray and the axis before it passes through the system.
References in periodicals archive ?
convergence ratio = # of feature points of convergence / # of total feature points
plot (a) shows repeatability and plot (b) the corresponding convergence ratio.
As can be seen from these plots, in most cases, AK-based methods achieve better convergence ratio and repeatability compared with FK-based methods.
The barrel diameter was 15 mm and the convergence ratio was kept constant, equal to 15/1 throughout the experiments.
In such a profile, the mixing region would be the longest possible for a given convergence ratio.
Experiments with blends of ultra-high molecular weight HDPE (UHWMPE) and HDPE showed that with a large convergence ratio, mixing efficiency decreased with an increasing flow rate, but when the convergence ratio was decreased to about half, mixing efficiency increased with an increasing flow rate (80, 82).
The convergence ratio (recall) for these cases is summarized in Figure 8.
In all the cases, the convergence ratio (CR) increases the most in the first iteration.
Simulations indicated fusion capsule convergence ratios of at least 10 and average distortions from sphericity of less than 30% are possible on the Z facility.
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