Optical fibre sensor for simultaneous temperature and relative humidity measurement: Towards absolute humidity evaluation
Optical fibre sensor for simultaneous temperature and relative humidity measurement: Towards absolute humidity evaluation
复制标题
同时测量温度和相对湿度的光纤传感器：朝向绝对湿度评估
DOI：
10.1016/j.snb.2021.130154
复制
发表时间：
2021-06-10
影响因子：
8.4
通讯作者：
Morgan, Stephen P.
中科院分区：
文献类型：
--
作者：
He, Chenyang;Korposh, Serhiy;Morgan, Stephen P.
温度和湿度是监测重症监护患者健康的重要参数。研制了一种基于反射光强度的光纤湿度和温度传感器。将这些测量值结合起来，可以获得绝对湿度值。首先用聚（烯丙胺盐酸盐）（PAH）/二氧化硅纳米颗粒（SiO2 NPs）涂层对纤维尖端进行改性以用于相对湿度（RH）测量，然后用热致变色液晶（TLC）涂层以用于温度测量。实验结果表明，在55 ~ 90%RH范围内，该器件的相对湿度和温度灵敏度分别为0.43%/RH%（650 nm处的强度）（R2 = 0.973）和3.97nm/℃（R2>0.99）。此外，所提出的传感器在每个感测参数之间具有低串扰，温度（30-38摄氏度）的响应时间为3.1秒，相对湿度（20- 80%）的响应时间为13.2秒。与基于光栅的光纤传感器相比，所提出的传感器具有低成本和简单的制造工艺，具有在医疗保健应用中广泛使用的潜力。
Temperature and humidity are essential parameters in monitoring the health of patients in critical care. An optical fibre sensor has been developed for simultaneous measurement of relative humidity (RH) and temperature at a single optical fibre tip based on the reflected intensity. Combining these measurements enables absolute humidity values to be obtained. The fibre tip is first modified with a coating of poly(allylamine hydrochloride) (PAH) / silica nanoparticles (SiO2 NPs) for relative humidity (RH) measurement and then coated with thermochromic liquid crystal (TLC) for temperature measurement. Experimental results demonstrate that the RH and temperature sensitivity are respectively 0.43 %/RH% (intensity at a wavelength of 650 nm) from 55 to 90% RH (R2 = 0.973) and 3.97 nm/degrees C from 28 to 46 degrees C (R2>0.99). Moreover, the proposed sensor has low crosstalk between each of the sensing parameters, with a response time of 3.1 s temperature (30-38 degrees C) and 13.2 s for relative humidity (20-80 %). In comparison to grating based optical fibre sensors the proposed sensor is low-cost with a simple manufacturing process which has the potential to find widespread use in healthcare applications.