Flexible Optical Waveguide Bent Loss Attenuation Effects Analysis and Modeling Application to an Intrinsic Optical Fiber Temperature Sensor

Abstract

The temperature dependence of the bending loss light energy in multimode optical fibers is reported and analyzed. The work described in this paper aims to extend an initial previous analysis concerning planar optical waveguides, light energy loss, to circular optical waveguides. The paper also presents a novel intrinsic fiber optic sensing device base on this study allowing to measure temperatures parameters. The simulation results are validated theoretically in the case of silica/silicone optical fiber. A comparison is done between results obtained with an optical fiber and the results obtained from the previous curved optical planar waveguide study. It is showed that the bending losses and the temperature measurement range depend on the curvature radius of an optical fiber or waveguide and the kind of the optical waveguide on which the sensing process is implemented.

Simulation of U-shaped plastic optical fiber ethanol sensor

“…Results in Table 5 Table 6, the sensitivity of the sensor is increased when the bending diameter was reduced. The results obtained is agreed with [10,[15][16]. As the bending of the fiber increased, their sensitivity profile toward surrounding also increases.…”

“…Results in Table 5 proves that as the bending radius getting smaller, less output power is captured since more lights was escaped from the fiber. The current finding in Table 5 is clearly supported by [10,[15][16]. In [15] s greater than 1.5cm, their bending losses is not significance.…”

“…From their investigation, they found that, the power loss eases obviously as the bending radius is less than 3cm. in [16] also found that with smaller curvature radius produced more bending losses. Results in Table 5 Table 6, the sensitivity of the sensor is increased when the bending diameter was reduced.…”

Comparison of sensitivity and resolution load sensor at various configuration polymer optical fiber

“…The curvature of the optical fiber is one aspect that is often used in the measurement system based on optical fiber sensor [4,19], while the imperfection will increase power losses that can cause increased sensitivity of the sensor [1,20]. The load sensor is made utilizing the principles by changes in light intensity due to the curvature on the optical fiber.…”

“…Optical fiber-based sensor applications has grown rapidly and can be used to measure different variables, such as the measurement of the electric field, an electric current, cracking, load measurement, temperature, displacement, strain, pressure and so forth. Several studies have reported that optical fiber can be used for measurement of the electric current using the optical fiber-based curvature sensors [2], the sensor of a pre-stressed concrete viaduct for structural healt monitoring (SHM) [3], the application for the temperature sensor with power losses curvature [4], the application of optical fibers for displacement sensor [5,6], for a strain sensor [7] and the application of optical fibers as a pressure sensor [8]. Further research will focus on the measurement of weight using microbending methods on the optical fiber-based sensors and OTDR [9].…”