Fiber‐Optic Chemical Sensors: A General Review

Abstract

De part ment of Chem is try, Na tional Chung-Hsing Uni ver sity, Taichung, Tai wan 402, R.O.C.Fi ber-optic sen sors pro vide a sim ple and fast way in de tec tion of in ter ested mol e cules in va ri ety of sample ma tri ces. To ac cel er ate the prog ress in this field, the ba sic sens ing prin ci ples and cur rent tech nol o gies of both ex trin sic and in trin sic types of fi ber-optic sen sors were de scribed in this ar ti cle. In the in trin sic fiber-optic sen sors, ev a nes cent wave ab sorp tion spec tro scopic method and flu o res cence spec tro scopic method based on ev a nes cent wave ex ci ta tion were in tro duced. In the ex trin sic fi ber-optic sen sors, two ma jor types of sen sors in clud ing flu o res cence spec tro scopic method and Raman spec tro scopic method were de scribed. The com ple men tary chem i cal in for ma tion and unique ad van tages of dif fer ent sen sors were de scribed.Fi ber-Op tic Chem i cal Sen sors: A Gen eral Re view

Fiber Optic Sensing Technologies for Battery Management Systems and Energy Storage Applications

“…The former depends on the time-dependent orientation of the fluorophores, while the many mechanisms of the latter can be described by the Stern–Volmer equation [ 75 ]. In [ 76 ], Yang et al categorized the arrangement of fluorescence fiber optic sensing into extrinsic and intrinsic sensing schemes. Extrinsic fluorescence fiber optic sensors require one optical fiber to guide the incident light wave and excite the fluorophore near the fiber, and another fiber to collect the emitted fluorescence radiation.…”

Hydrogel Films on Optical Fiber Core: Properties, Challenges, and Prospects for Future Applications

“…The evanescent waves have been widely used for the spectroscopic detection of chemical and biological species by fiber-optic sensors [78][79][80][81]. In our previous work [95], evanescent waves were used to initiate a polymerization reaction around a fiber core.…”

“…The idea of a hydrogel/optical fiber assembly has been already employed for decades mostly in the context of the fiber optic chemical and biochemical sensors [78][79][80][81]. The features of hydrogels relevant to the purpose of optical fiber coating are: satisfactory light transmission, low refractive index (lower than that of glass), compatibility with glass substrates, permeability for water-born analytes, and mechanical stability due to cross-linking.…”

“…There exist numerous sensing schemes [78][79][80][81], however, a simple analysis shows that only two methods of deposition of hydrogel matrix on an optical fiber have been employed: (i) hydrogel spots were polymerized on fiber distal ends (not on the side wall of a fiber core) by direct light [78,92,93] and (ii) hydrogel was deployed on side-surface of a fiber core by spreading a preliminary prepared polymer followed by its further cross-linking [94].…”