Hussian Sadam, Mehdi Mujahid, Ghaffar Abdul, Lan Kun, Hu Yanjun, Lin Huan, Qaisrani Mumtaz A, Ali Sikandar, Lin Jie, Mehdi Rehan, Ma Rui
Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province, College of Mechanical Engineering, Quzhou University, Quzhou, 32400, Zhejiang, China.
Faculty of Design, Aror University of Art Architecture Design & Heritage Sindh, Sukkur, 65200, Pakistan.
Sci Rep. 2024 May 10;14(1):10735. doi: 10.1038/s41598-024-59853-3.
The humidity has often been measured through a single point sensor. Where, the humidity could be varied at different locations as well as depending on environmental conditions. The present paper developed the dual point humidity measuring sensor by using a polymer optical fiber (POF) based on a single illuminating fiber. The sensor's basic structure is to twist two fibers and bend them at a certain radius. However, the dual point sensor is developed through the cascading of twisted micro bend (TMB-1 and TMB-2). The twisting of fibers couples the light from one fiber to another fiber through the side coupling method. An increase in the humidity level leads to a change in the reflective index, which helps to get variation in coupled light intensity. To measure the humidity, the dual point sensors are placed into the control humidity chamber at two random positions. The power reading variation is significantly linear when the humidity level increases from 30 to 80%. The sensor has a fast response of about 1 s and a recovery time of about 4 s. Furthermore, the chemical coating is applied to improve the sensor's sensitivity. Between 30 and 80% range of humidity, the both sensors of dual point TMB-1 and TMB-2 have appropriate sensitivity and detection limits, which is about 680.8 nW/% and 763.9 nW/% and 1.37% and 1.98%, respectively. To measure the humidity at variable positions, the present dual points humidity sensor is well-stable, easy, and straightforward, which uses a less expensive method.
湿度通常通过单点传感器进行测量。在不同位置以及根据环境条件，湿度可能会有所变化。本文基于单根照明光纤，利用聚合物光纤（POF）开发了双点湿度测量传感器。该传感器的基本结构是将两根光纤扭转并以一定半径弯曲。然而，双点传感器是通过级联扭曲微弯（TMB - 1和TMB - 2）来开发的。光纤的扭转通过侧面耦合方法将光从一根光纤耦合到另一根光纤。湿度水平的增加会导致折射率的变化，这有助于使耦合光强度产生变化。为了测量湿度，将双点传感器放置在控制湿度箱中的两个随机位置。当湿度水平从30%增加到80%时，功率读数变化呈显著线性。该传感器具有约1秒的快速响应和约4秒的恢复时间。此外，通过施加化学涂层来提高传感器的灵敏度。在30%至80%的湿度范围内，双点TMB - 1和TMB - 2的两个传感器都具有适当的灵敏度和检测限，分别约为680.8 nW/%和763.9 nW/%以及1.37%和1.98%。为了在可变位置测量湿度，本双点湿度传感器稳定性好、操作简便，采用了成本较低的方法。
