Title :
Characterization of Rectangular Glass Microcapillaries by Low-Coherence Reflectometry
Author :
Carpignano, Francesca ; Rigamonti, Giulia ; Merlo, Sabina
Author_Institution :
Dipt. di Ing. Ind. e dell´Inf., Univ. degli Studi di Pavia, Pavia, Italy
Abstract :
We report the functionality of optical low-coherence reflectometry (OLCR) to characterize glass micro-capillaries with 50-μm deep rectangular cross section, in view of their application as microoptofluidic devices. We exploited infrared radiation generated by a tungsten lamp in a time-domain low-coherence interferometer based on a fiberoptic Michelson scheme. OLCR allowed us to easily detect the optical distance between in-depth interfaces of the capillary as well as the refractive index of ethylene glycol solutions in water at different concentrations, which were inserted into the channel by capillary action.
Keywords :
Michelson interferometers; fibre optic sensors; infrared spectra; light coherence; light interferometry; micro-optics; optical glass; optical testing; organic compounds; reflectometry; refractive index; refractive index measurement; depth 50 mum; ethylene glycol solutions; fiberoptic Michelson scheme; infrared radiation generation; microoptofluidic devices; optical low-coherence reflectometry; rectangular glass microcapillary characterization; refractive index; time-domain low-coherence interferometer; tungsten lamp; water; Glass; Optical fibers; Optical interferometry; Optical reflection; Optical refraction; Optical variables control; Distance measurements; Glass rectangular micro-capillary; Infrared radiation; Optical low-coherence reflectometry; Refractive index measurements; distance measurements; glass rectangular micro-capillary; infrared radiation; refractive index measurements;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2407271
