SPECTROPHOTOMETRIC STUDIES OF CHEMICAL-SPECIES USING TAPERED CORE MULTIMODE OPTICAL-FIBER

A spectrophotometer has been developed using tapered core multimode op tical fiber (PCS-600). It is based on the phenomenon of evanescent wav e absorption and is capable of identifying the chemical species having the absorption peaks in the visible region of the spectrum (400-700 n m). Aqueous dye solutions of different concentration in the pure and m ixed form have been tried and detected. The experimental results obtai ned are discussed in the form of the possibility of using this system as a spectrophotometer. A microprocessor based programmable kit for ta pering the optical fiber with good precision and the detector system f or the output signal, designed and developed are also discussed. (C) 1 997 Elsevier Science S.A.