Gao Ran, Lu Danfeng, Cheng Jin, Qi Zhi-Mei
Opt Lett. 2017 Jul 15;42(14):2703-2706. doi: 10.1364/OL.42.002703.
A real-time all-fiber anemometer based on laser-heated few-layer graphene in aligned graded-index fibers has been proposed and experimentally demonstrated. The proposed fiber-optic anemometer was composed of a pair of all-fiber collimators by using aligned graded-index fibers that was coated with the few-layer graphene. The few-layer graphene was heated through a heating light from a 532-nm laser, which changed the optical transmittance of signal light with the wavelength of 1550 nm. The wind speed can be measured through the transmission power of the signal light based on the wind cooling effects on the heated few-layer graphene, acting as a "hot-wire" anemometer. The experimental results show that the maximum sensitivity of the anemometer reaches -22.03 μW/(m/s), and a fast response time of as 0.064 s can be achieved. The proposed fiber sensor can be used for the real-time measurement of wind speed in the fields of environmental monitoring, oil exploration, oceanography research, etc.
一种基于排列渐变折射率光纤中激光加热的少层石墨烯的实时全光纤风速计已被提出并通过实验验证。所提出的光纤风速计由一对全光纤准直器组成，使用涂覆有少层石墨烯的排列渐变折射率光纤。少层石墨烯通过532纳米激光器发出的加热光进行加热，这改变了波长为1550纳米的信号光的光学透过率。基于风对加热的少层石墨烯的冷却效应，风速可以通过信号光的传输功率来测量，起到“热线”风速计的作用。实验结果表明，风速计的最大灵敏度达到-22.03 μW/(m/s)，并且可以实现0.064秒的快速响应时间。所提出的光纤传感器可用于环境监测、石油勘探、海洋学研究等领域中风速的实时测量。
