College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China.
Sensors (Basel). 2022 Dec 8;22(24):9605. doi: 10.3390/s22249605.
Optical fiber sensors are one preferred solution for temperature sensing, especially for their capability of real-time monitoring and remote detection. However, many of them still suffer from a huge sensing system and complicated signal demodulate process. In order to solve these problems, we propose a smartphone-based optical fiber fluorescence temperature sensor. All the components, including the laser, filter, fiber coupler, batteries, and smartphone, are integrated into a 3D-printed shell, on the side of which there is a fiber flange used for the sensing probe connection. The fluorescence signal of the rhodamine B solution encapsulated in the sensing probe can be captured by the smartphone camera and extracted into the R value and G value by a self-developed smartphone application. The temperature can be quantitatively measured by the calibrated G/R-temperature relation, which can be unified using the same linear relationship in all solid-liquid-gas environments. The performance verifications prove that the sensor can measure temperature in high accuracy, good stability and repeatability, and has a long conservation time for at least 3 months. The proposed sensor not only can measure the temperature for remote and real-time detection needs, but it is also handheld with a small size of 167 mm × 85 mm × 75 mm supporting on-site applications. It is a potential tool in the temperature sensing field.
光纤传感器是温度传感的首选解决方案之一，特别是因为它们具有实时监测和远程检测的能力。然而，许多光纤传感器仍然存在传感系统庞大和信号解调过程复杂的问题。为了解决这些问题，我们提出了一种基于智能手机的光纤荧光温度传感器。所有组件，包括激光、滤波器、光纤耦合器、电池和智能手机，都集成在一个 3D 打印外壳中，外壳的一侧有一个光纤法兰，用于连接传感探头。传感探头上封装的罗丹明 B 溶液的荧光信号可以被智能手机的摄像头捕捉，并通过我们自主开发的智能手机应用程序提取出 R 值和 G 值。通过校准的 G/R-温度关系可以定量测量温度，该关系可以在所有固液气环境中使用相同的线性关系进行统一。性能验证证明，该传感器可以高精度、良好的稳定性和重复性地测量温度，并且至少可以保存 3 个月的时间。所提出的传感器不仅可以满足远程和实时检测的温度测量需求，而且还具有手持、体积小（167mm×85mm×75mm）的特点，支持现场应用。它是温度传感领域的一种有潜力的工具。
