numerical aperture


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numerical aperture

[nü′mer·i·kəl ′ap·ə·chər]
(optics)
A measure of the resolving power of a microscope objective, equal to the product of the refractive index of the medium in front of the objective and the sine of the angle between the outermost ray entering the objective and the optical axis. Abbreviated N.A.

numerical aperture

The measurement of the acceptance angle of an optical fiber, which is the maximum angle at which the core of the fiber will take in light that will be contained within the core. Taken from the fiber core axis (center of core), the measurement is the square root of the squared refractive index of the core minus the squared refractive index of the cladding. See critical angle and fiber optics glossary.


The Acceptance Angle
The numerical aperture measures the acceptance angle of a fiber.
References in periodicals archive ?
Another optical inspection device, the SimmScope, which one of the authors (Simmons) designed for visual inspection of populated and unpopulated printed circuit boards, incorporates a microscope having an objective lens with numerical aperture = 0.
Table 1: Comparison of rewritable Blu-ray and HD-DVD formats BD BD HD-DVD HD-DVD Number of Recording Layers Single Double Single Double Capacity 25GB 50GB 20GB 40GB Laser wavelength 405nm 405nm 405nm 405nm Numerical aperture (NA) 0.
In considering the two candidate systems, the copolymers of MMA and BMA provide better numerical aperture and miscibility over a wider range.
An angle of 30[degrees] is at the edge of a solid angle corresponding to a numerical aperture (NA) of 0.
Numerical aperture refers to the light gathering ability plus the resolving power of the lens.
We then examined the cytoskeletal morphologies with an Olympus confocal microscope (Olympus, Tokyo, Japan) equipped with a krypton/argon laser and an Olympus 60 x numerical aperture, 1.
Because the resist film used in the TSV and Bump processes is relatively thick, the FPA-5510iV is equipped with an optimized Numerical Aperture for patterning features sized from one to several tens of microns, and small, deep vertical holes in the thick resist.
This lens is manufactured from LightPath's Black Diamond(TM) IR Glass and has a high numerical aperture designed for maximum light collection from quantum cascade lasers.
7GB Laser Wavelength 635nm 650nm Numerical Aperture 0.
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