Laboratory of Photonic Materials and Devices, School of Mechanical Engineering, University of Campinas, São Paulo 13083-860, Brazil.
Sensors (Basel). 2020 Jan 28;20(3):707. doi: 10.3390/s20030707.
This work presents an optical fiber dynamic light scattering sensor capable of simultaneously assessing concentration and flow speed of nanofluids. Silica nanoparticles (189 nm) in water were tested, yielding a sensitivity of 0.78288 × 10³ s for static conditions. Then, the sensor was submitted to situations that simulate spatial concentration changes, offering better results than those obtained by traditional mathematical models. Finally, in flow tests, the light backscattered by the nanoparticles were collected by a fiber probe placed parallel to the streamline, whereas intensity values were processed by artificial neural networks. The sensor provides average errors of 0.09 wt% and 0.26 cm/s for concentration and speed measurements, respectively, and can be further applied to assess different types of nanofluids and inline processes.
本工作提出了一种光纤动态光散射传感器，能够同时评估纳米流体的浓度和流速。在水中测试了 189nm 的二氧化硅纳米粒子，在静态条件下得到了 0.78288×10³ s 的灵敏度。然后，传感器被置于模拟空间浓度变化的情况下，结果优于传统数学模型的结果。最后，在流动测试中，通过放置在流线平行的光纤探头收集纳米粒子的反向散射光，通过人工神经网络处理强度值。该传感器对浓度和速度测量的平均误差分别为 0.09wt%和 0.26cm/s，可进一步应用于评估不同类型的纳米流体和在线过程。
