光学
材料科学
图像分辨率
激光器
探测器
光纤激光器
温度测量
光纤
波长
光电子学
光纤传感器
分布式声传感
物理
量子力学
作者
Julien Gasser,Daryl Warpelin,Félix Bussières,Jérôme Extermann,Enrico Pomarico
出处
期刊:Optics Express
[The Optical Society]
日期:2022-02-15
卷期号:30 (5): 6768-6768
被引量:19
摘要
We present a Raman distributed temperature sensor based on standard telecom single mode fibers and efficient polarization-independent superconducting nanowire single photon detectors. Our device shows 3 cm and 1.5 °C resolution on a 5 m fiber upon one minute integration. We show that spatial resolution is limited by the laser pulse width and not by the detection system. Moreover, for long fibers the minimum distance for a measurable temperature step change increases of around 4 cm per km length, because of chromatic dispersion at the Stokes and Anti-Stokes wavelengths. Temperature resolution is mainly affected by the drop in the laser repetition rate when long fibers are tested. On a 500 m fiber, a trade-off of 10 cm and 8 °C resolution is achieved with 3 minutes integration. Fiber-based distributed temperature sensing, combining centimetric spatial resolution with hundreds of meters sensing range, could pave the way for a new kind of applications, such as 2D and 3D temperature mapping of complex electronic devices, particles detectors, cryogenic and aerospace instrumentation.
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