Article, A Temperature and Pressure Sensor Network Application by the Fiber Loop Ringdown Spectroscopy Technique
A Temperature and Pressure Sensor Network Application by the Fiber Loop Ringdown Spectroscopy Technique
DOI:
https://doi.org/10.65273/hhit.jna.2026.2.1.014Keywords:
fiber loop ringdown spectroscopy technique;, FLRDS, pressure sensor, sensor network, temperature sensorAbstract
A novel sensor network was developed by connected two fiber loops with a bare single mode fiber (SMF) in series without any modification on the sensorheads to observe temperature and pressure variations with high sensitivity and real-time merit by utilizing the fiber loop ringdown spectroscopy (FLRDS) technique. For the evaluation of temperature and pressure changes, difference in optical losses was considered for each applied steps. Ringdown times (RDTs) of the fiber loops were separately recorded and considered to calculate optical losses. Two different loops of 118±2 m and 43±2 m lengths were employed as temperature and pressure sensors, respectively. The temperature sensor was embedded in a circular copper housing and the RDTs were recorded in the range of 30 ÷ 150 °C with 30 °C steps. A cross-point was created in the second fiber loop and utilized as a pressure sensorhead to test pressure responses in the range of 0 ÷ 0.98×106 Pa. The network system was simply designed and carefully optimized to achieve the lowest system baselines as 0.21% for the temperature and 0.24% for the pressure sensor systems, respectively. For the sensor network, an SMF loops were the first time specially designed and utilized without any modification with the FLRDS technique. Its outstanding features such as low cost, basic setup, portability, high sensitivity, continuous and real-time monitoring advantages have promising outcomes to be employed in a wide range application area, i.e. healthcare as biosensor network, structural health monitoring as multiple measurement of pressure, crack, temperature, etc., transportation and communication applications.
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