Optical fibers in instrumental UV-analytics

Abstract

Physical and optical properties of optical fibers have improved over recent years significantly. Especially classic UV detection techniques in traditional chemistry, HPLC and dissolution testing rely more and more on fiber optic light guiding techniques to transport light to and from a sample simplifying the design of such detection techniques. An overview on the current status of UV-fiber optical properties will be given in this work. Especially, the reduction of UVdefects in the 215 nm wavelength region leading to a lower drift in the whole system, will be discussed. However, these are not the only parameters of interest in a fiber-optic system. For process control or instrumental analytics, the long-term stability including drift and noise must be determined. This requires stringent fiber test procedures similar to light-sources, connectors and complete detector systems. Further, white-light interference between optical interfaces of a fiber optic detection system due to axial movement, degradation of components and temperature often reduces system stability and must be considered. Finally, a cleaning-in-process of a fiber optic immersion probe will be introduced as a further step of system improvement.

A Review of Optical Fibre Ethanol Sensors: Current State and Future Prospects

“…Conventional optical fibres used in communications and sensing have been historically based on a classical solid core and solid cladding structure. However, there have been some exceptions to these, e.g., UV-transmitting fibres [ 52 ]. Microstructure Optical Fibres (MOFs) represent a relatively recent development in optical fibre technology.…”

Influence of light-sources on UV fiber damage measured with DIN standard 58145

“…light-source dependent 6,7,8,9 . New, more sensitive and compact fiber optic spectroscopic applications and products were designed and established in a growing market 9,11,12 . UV fibers were used in high pressure liquid chromatography 13 , thin layer chromatography 14 , sensitive protein detection with UV LEDs and liquid core waveguides 15 , UV gas chromatography 16 , UV laser-based pollutant sensing 17 and colored dissolved organic matter (CDOM) detection in seawater 18 , only to name a few.…”

Automatic Correction for Window Fouling of near Infrared Probes in Fluidised Systems

“…the Lighthouse Probe™ by GEA Pharma Systems, Belgium) and to clean the probe with solvents and wiping. [27][28][29] Additional strategies, e.g. the application of non-adhesive films 30 and more, exist.…”