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$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

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Published on: March 13, 2013

Chemical sensing using fiber cavity ring-down spectroscopy.

Helen Waechter¹, Jessica Litman, Adrienne H Cheung

¹Queen's University, Department of Chemistry, Kingston, ON, K7L 3N6, Canada. wachterh@chem.queensu.ca

Sensors (Basel, Switzerland)

|February 2, 2012

Summary

This summary is machine-generated.

Waveguide cavity ring-down spectroscopy offers precise chemical concentration measurements using fiber optic sensors. This technique analyzes changes in light decay to detect analytes in liquids, gases, and films.

Keywords:

42.60.Da 42.62.Fi 42.81.Pa 78.20.Ci 82.80.Dx PACS 07.60.Vg absorption capillary electrophoresis cavity ring-down (CRD)fiber Bragg grating (FBG)fiber cavity fiber-loop long-period grating (LPG)microfluidics phase-shift refractive index

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Area of Science:

Analytical Chemistry
Spectroscopy
Materials Science

Background:

Cavity ring-down spectroscopy (CRD) is a sensitive technique for chemical analysis.
Fiber optic sensors offer advantages for in-situ and remote measurements.
Quantitative chemical sensing requires precise correlation between optical properties and analyte concentration.

Purpose of the Study:

To explore waveguide-based cavity ring-down spectroscopy for quantitative chemical sensing.
To investigate the use of fiber optic sensing elements for CRD measurements.
To compare different fiber cavity configurations and their coupling to sensor elements.

Main Methods:

Utilized waveguide-based cavity ring-down spectroscopy.
Employed fiber optic sensing elements to detect changes in attenuation.
Correlated changes in ring-down time to analyte concentration based on absorption or refractive index.
Investigated two types of fiber cavities: fiber loops and fiber strands with reflective elements.

Main Results:

Demonstrated the feasibility of waveguide-based CRD for quantitative measurements.
Showcased the correlation between fiber optic sensor attenuation changes and analyte concentration.
Presented a comparison of different fiber cavity designs coupled to various chemical sensor elements.

Conclusions:

Waveguide-based CRD spectroscopy is effective for quantifying chemical concentrations in diverse sample types (liquids, gases, films).
Fiber optic sensing elements are suitable for CRD, with attenuation changes linked to analyte properties.
The choice of fiber cavity design impacts sensor performance and should be matched with specific chemical sensing applications.