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Temperature optical fiber

Temperature of an optical fiber.

Symbol
$\theta_{fo}$
Unit
°C
Formulas
$\theta_a+v_4 \Delta \theta_p-\left(v_4-1\right) \Delta \theta_x$fiber optic cable buried
$\frac{\theta_t T_{sa}+\theta_{at} T_{st}}{T_{sa}+T_{st}}$fiber optic cable in ventilated tunnel
$\theta_t$fiber optic cable in channel (Heinhold)
$\theta_{at}$fiber optic cable in air-filled trough, in air-filled pipe with objects
$\theta_a+v_4 \Delta \theta_p-\left(v_4-1\right) \Delta \theta_x$fiber optic cable in filled troughs
Related
$\Delta \theta_p$
Temperature rise by other buried objects [K]
$\Delta \theta_x$
Critical soil temperature rise [K]
$T_{sa}$
Thermal resistance convection object—air [K.m/W]
$T_{st}$
Thermal resistance radiation object—tunnel [K.m/W]
$\theta_a$
Ambient temperature [°C]
$\theta_{at}$
Air temperature with load [°C]
$\theta_t$
Temperature wall (inner) [°C]
$v_4$
Ratio thermal resistivity dry/moist soil
Used in
$\Delta \theta_{max}$
Maximum permissible conductor temperature rise [K]