| Standardization field | Electrical engineering
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| Technical committee | BAS/TC 30- Electric cables |
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| Term (EN) | phase coefficient, phase constant (term deprecated) (USA) (symb.: β) |
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| Definition (EN) | The imaginary part of the propagation coefficient.
Note. — The phase coefficient of an optical waveguide is the limit of the phase change of a field quantity between two points on the axis of the guide divided by the distance between the points when this distance tends to zero. |
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| Term (FR) | |
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| Definition (FR) | |
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| Term (DE) | |
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| Definition (DE) | |
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| Term (BS) | |
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| Definition (BS) | |
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| Term (HR) | |
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| Definition (HR) | |
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| Term (SR) | fazni koeficijent, fazna konstanta (zastarjeli termin) (SAD) (simbol: β) |
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| Definition (SR) | Imaginarni dio koeficijenta prostiranja.
Napomena — Fazni koeficijent optičkog talasovoda je granica promjene faze vrijednosti polja između dvije tačke na osi voda podijeljen udaljenošću između tačaka kada ovo rastojanje teži nuli. |
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| Date | 2017-08-09 |
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| Standards | BAS IEC 60050-731:2017 |
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