Spectrophotometric studies of chemical species using tapered core multimode optical fiber

On‐line Monitoring of Polymerization and Cure

“…In the short-wavelength UV region, however, the optical absorption of the fiber core and/or cladding material restricts light throughput. Recently, evanescent wave fiber-optic absorption sensors for use in the UV and VIS regions have been described (eg, [7,8]). UV reflection spectroscopy with a fiber-optic accessory has been applied to characterize the cure of bis(maleimide) resins [9,10].…”

Optical fibres and sensors for biomedical applications

“…Warken et al (2007) performed surface absorption measurements on an MNF of 500 nm diameter and 3 mm length with sub-monolayers of PTCDA molecules at ambient conditions. A spectrophotometer based on tapered multimode fibre was developed by Vishnoi et al (1997) by removing the cladding in the central portion and tapering. Takiguchi et al (2011) performed saturated absorption spectroscopy of acetylene (C 2 H 2 ) n1 + n3 band transitions with an MNF.…”

A Review of Microfiber and Nanofiber Based Optical Sensors

“…Due to the high intensity evanescent field surrounding the MNF, a Lamb dip was observed using a relatively low powered laser without a cavity. A spectrophotometer based on tapered multimode fiber was developed by Vishnoi et al [138], by removing the cladding in the central portion and tapering. Different tapering ratios of 1.5, 1.82, 2.0 and 2.4 were prepared with the tapering length of 1.2 cm.…”