TY - JOUR
AU1 - Lal, Sundeep
AU2 - Yappert, M. Cecilia
AB - A double-waveguide evanescent sensor has been developed and characterized. A fraction of the evanescent field (λe = 488 nm) generated at the core (nc = 1.48)/cladding (ncl = 1.45) interface of a glass optical fiber penetrates into the cladding and the polymeric jacket (nj = 1.54) coated onto the cladding. Fluorescence is excited within the jacket and, due to the higher refractive index of the jacket, the emission is totally internally reflected within it. The emission (λem = 605 nm) has been collected with the use of lateral and front-end geometries. The sensor has been used to determine iodine in gas and liquid phases using an indirect approach. Iodine reacts with unsaturated sites of the polymer and absorbs the fluorescence, causing a reduction in the fluorescence background. The rate of fluorescence reduction is proportional to the concentration or partial pressure of iodine in the sample.
TI - Development, Characterization, and Application of a Double-Waveguide Evanescent Sensor
JF - Applied Spectroscopy
DO - 10.1366/0003702914335328
DA - 1991-12-01
UR - https://www.deepdyve.com/lp/sage/development-characterization-and-application-of-a-double-waveguide-dB0UBh0MCp
SP - 1607
EP - 1612
VL - 45
IS - 10
DP - DeepDyve
ER -