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Index of refraction (ior)
| Fiber Optic Glossary |
The ratio of the speed of light in a vacuum to the speed of light in a material. when light strikes the surface of a transparent material, some light is reflected while some is bent (refracted) as it enters. the ior is used to calibrate otdrs for measuring fiber length
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Transparent, английский
- An object or material that transmits both light and undiffused images. tip: try lighting a plain back-ground directly behind the object, not the object.
- Capable of transmitting light so that objects or images can be seen as if there were no intervening material.
- Общедоступная информация в вто присутствует принцип открытого обмена информацией, осуществляемый с целью осведомить всех членов о принимаемых решениях и вопросах, обсуждаемых на совещаниях и встречах маленьких групп
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Rayleigh scattering, английский
- The scattering of light into a direction generally reverse to the original one. the principle on which otdrs operate; the scattering of light caused by index of refraction variations in the submicroscopic structure of the glass. one of the two major causes of attenuation in optical fibers
- Scattering of radiation in the course of its passage through a medium containing particles, the sizes of which are small compared with the wavelength of the radiation.
- Scattering of light at scattering centers which are much smaller than the wavelength
- The scattering of light that results from small inhomogeneities of material density or composition.
- Рэлеевское рассеяние
- Рассеяние рэлея. см. scattering — рас* сеяние. ¦ , ¦ : : . .: i real-time measurement — разовое измерение. измерение, выполняемое практически одновременно с измеряемым явлением. в исследованиях по загрязнению атмосферного воздуха оно противоположно интегральным методам или методам осреднения по времени, когда проводится определение средней концентрации загрязнителя за данный период времени.. разовые измерения имеют особое значение, когда исследуемые загрязнители представляют опасность для здоровья.
Backscatter coefficient, английский
The ratio of the optical pulse power (not energy) at the otdr output to the backscatter power at the near end of the fiber (z0). this ratio is inversely proportional to the pulse width, because the optical pulse power is independent. it is expressed in db
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