Temperature Sensing and Modeling Based on Optical Fiber Using the OFDR Technique

Resumo

Optical Frequency Domain Reflectometry (OFDR) is a distributed sensing technique that stands out for its high spatial resolution and sensitivity, being widely applied in explosive risk environments, high temperatures, and high electromagnetic interference. The present work proposes a distributed temperature sensing system based on optical fiber using the OFDR technique, with the objective of visually modeling the thermal distribution of objects in real time. The system consisted of calibrating the sensor for the clear curve type optical fiber, which was separated into continuous segments and connected to an OFDR interrogator, allowing the collection of thermal data. A system was developed to process the data and generate a two-dimensional visual model based on the temperature distribution along the fiber. The results demonstrate that the system was able to identify thermal variations, with sensitivity and high spatial resolution, allowing the reconstruction of objects in contact with the fiber.