The Temperature Effect on U and Coil Shaped POF Sensors to Detect Refractive Index Change

The effect of the temperature on refractive index (RI) sensors based on U and Coil-shaped plastic optical fiber (POF) was investigated. For this purpose, four POF-RI sensor probes were produced, and RI changes caused by ethanol changes in solutions were detected. Two of the produced probes were U-shaped, while the other two were Coil-shaped. For the first time in the literature, the effect of both the geometry of the U and Coil-shaped POF-RI sensors on the sensor parameters and the effect of the medium temperature have been analyzed together. As a result of the experiments conducted at 25 degrees C, the best RI change detection sensitivity, linearity, and resolution values were determined as 821%/RIU, 0.9974 (R-2), 5.18 x 10(-4). In addition, temperature dependence loss (TDL) and temperature dependence RI deviation (TDR) were measured at different temperatures (25-40 degrees C) in the 1.3346-1.45 RI range, and the effect of temperature change on POF-RI sensor probes was characterized.

Automated summary

The study investigated the influence of temperature on refractive index sensors based on U and Coil-shaped plastic optical fibers. The experiments showed that at 25 degrees Celsius, the best RI change detection sensitivity, linearity, and resolution values were determined. Temperature dependence loss and temperature dependence RI deviation were also measured at different temperatures to characterize the effect of temperature change on the POF-RI sensor probes.