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Penumbra (rt)
| Глоссарий терминов по технологиям неразрушающего контроля (NDT) |
The shadow cast when the incident radiation is partly, but not wholly, cut off by an intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides and the full light. a marginal region of the borderland of partial obscurity.
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Penumbra, французский
Literally, "dim light"; the outer filamentary region of a sunspot.
Penumbra, английский
- The lighter shade which surrounds the dark shadow of the earth in an eclipse of the moon. also, the light shade which usually encircles the black spots upon the sun`s disc.
- "мягкое" затенение (в графике)
Illumination, английский
- Освещение; облучение (цели)
- Lighting minus craft. also, someone else`s setup.
- The amount or intensity of light striking an object.
- The luminous flux density incident on a surface, i.e., the luminous flux per unit area; usually expressed in lumens per square foot or footcandles, and lumens per square meter or lux.
- Act of illuminating or state of being illuminated. see also illuminate. compare illuminance.2,6
Borderland, английский
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Boundary wavelength (quantum limit) (rt), английский
The shortest wavelength present in a continuous xray spectrum. it is inversely proportional to the peak voltage applied to the x-ray tube.
Rejection level (ut), английский
The setting of the signal level above or below which all parts are rejectable as, in an automatic system, at which objectionable parts will actuate the reject mechanism of the system.
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