The possibility of designing a distributed fibre-optic sensor, allowing one to measure cryogenic temperatures (to liquid nitrogen boiling point), is experimentally demonstrated. The principle of operation of the sensor is based on measuring the intensity of boson peaks of Raman scattering in a fibre material, which are spaced by 1 to 3 THz from the probe frequency. The measurements are performed using a single-mode telecommunication fibre with a 15-μm-thick polyimide coating. The probe wavelength is 1.55 μm, the sensor spatial resolution is 4 m, and the averaging time is 60 s. Experiments are carried out in the temperature range of 75.6–79.6 K, with a temperature resolution of 0.5 K.

中文翻译：

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基于对拉曼光散射玻色子成分的检测，用于低温应用的分布式光纤温度传感器

实验证明了设计分布式光纤传感器的可能性，该传感器可以测量低温温度（至液氮沸点）。传感器的工作原理是基于测量纤维材料中拉曼散射的玻色子峰的强度，该强度与探头频率的间隔为1至3 THz。使用具有15μm厚的聚酰亚胺涂层的单模电信光纤进行测量。探头波长为1.55μm，传感器空间分辨率为4 m，平均时间为60 s。实验在75.6–79.6 K的温度范围内进行，温度分辨率为0.5K。