Are fiber optic cables afraid of high temperatures? Different types of optical fibers have an upper limit value. The working temperature of a standard fiber optic network cable is -40 º C to+75 º C.
If it is an industrial optical fiber, due to the different composition of each type of optical fiber, it can withstand different high and low temperatures. Please consult the manufacturer for specific information.
Fiber optic is affected by temperature
1. The temperature characteristics of optical fibers refer to the impact on fiber loss under high and low temperature conditions. Under low temperature conditions, the loss of optical fibers increases due to the different expansion coefficients of the fiber coating layer, plastic coating layer, and quartz. The thermal expansion coefficients of organic resins and plastics are much larger than those of quartz. Low temperature shrinkage and high temperature elongation result in slight bending of the fiber under this axial compression force, which increases the loss. If working at low temperatures, as the temperature continuously decreases, the fiber loss increases. When the temperature drops to around -55 ℃, the loss increases sharply, making the system unable to operate normally.
2. The slight bending loss caused by temperature changes in optical fibers is due to thermal expansion and contraction. Physics knows that the thermal expansion coefficient of silicon dioxide (SiO2), which makes up optical fibers, is very small and almost does not shrink when the temperature decreases. During the process of fiber optic cable formation, it must be coated and some other components must be added. The coefficient of expansion of the coating material and other components is relatively high. When the temperature decreases, the shrinkage is more severe. Therefore, when the temperature changes, the coefficient of expansion of the material is different, which will cause the fiber optic to produce slight bending, especially in the low-temperature region.
Fiber optic working temperature range
The upper and lower limits of the working environment temperature for fluorescent fiber optic temperature measurement systems are usually between -20 ℃ and+55 ℃
The measurement range of fiber optic temperature sensors is -40 ℃~20.0 ℃. In addition, higher temperature sensing temperature sensors can be customized.
Generally, conventional high-temperature resistant optical fibers have a long-term temperature range of -20 ° to+300 °, with a maximum of 350 ° in the short term
The working environment temperature of the distributed fiber optic temperature measurement system is -10 ℃~50 ℃, and the conventional temperature measurement range is -40~120 ℃; High temperature optical cable: -40-400 ℃
The measurement temperature range of fiber optic grating temperature sensors is -40 ℃~300 ℃