Development of stripped-cladding optical fiber sensors for continuous monitoringII: Referencing method for spectral sensing of environmental corrosion

Development of stripped-cladding optical fiber sensors for continuous monitoring

“…A second measurement with a different angular input (θ ≤ θ 2nd ) immediately follows the first. The ratio of these two transmitted signals will be denoted as TAR, the transmitted angular ratio, and is calculated as follows: Variation in the angular input can be achieved using optical lenses [15,16], and experimental implementation of these measurements is the subject of a manuscript in preparation.…”

“…Consequently, the light intensity at the detector end of the fiber is attenuated by multiple refractive losses. As such, external reflection constitutes an effective absorption of the transmitted light through the fiber [16,20]. When n core > n measured fluid , light is transmitted through the fiber mainly via reflection at smaller angles.…”

“…are attached to the uncladded waveguide [10][11][12][13][14]. In other reports the transducers measure refractive index changes indicating chemical reaction extents [15][16][17][18]. Optical sensing of an environment's corrosiveness, the relative capacity of an environment to affect a metallic corrosion optical transducer, has been reported by Abderrahmane et al [18] and Jaffrezic-Renault's group [19,20].…”

Optical Sensors for Corrosion Monitoring

“…48 Sensors used to detect corrosion on aluminum, 49,51 copper, 52 nickel, 53,54 or steel 55,56 are present in the bibliography. The cladding of a portion of optical fiber is replaced by a high-reflecting coating of the same material to be monitored.…”

Analytical Modeling Tool for Design of Hydrocarbon Sensitive Optical Fibers

“…Other approaches utilize LPGs whose cladding is spectrally sensitive to sodium chloride concentrations. Stripped cladding sensors utilizing thermally-deposited metal coatings may be used to detect its removal as transmitted power is restored to previous levels before applying the metal cladding [ 8 , 9 , 10 ]. Point reflectivity probes may be used to scan the surfaces of pipes and walls to detect surface damage or bacterial colonies [ 6 , 11 ].…”