22 November 2016 Simple low-cost refractometer using a disposable optical fiber tip for measurements
Author Affiliations +
Abstract
A simple but accurate fiber-optic refractometer based on Fresnel reflection in the tip of a single-mode optical fiber is reported. The refractometer can be easily assembled using a distributed feedback laser as a light source and standard low-cost fiber-optic components. The short section of an optical fiber cleaved at right-angle in both tips is used as a disposable needle-type sensor head. The sensing fiber being connected with the angle-cleaved lead fiber forms a stable reflector used for light intensity reference. Signals from the sensing and reference fiber tips, generated by modulating the laser optical frequency with a sawtooth-wave form, are demultiplexed using methods of optical frequency-modulated continuous-wave interferometry. Despite the simplicity of the device, a repeatability and reproducibility of 6×10−4  RIU and 3×10−4  RIU, respectively, were demonstrated in dip-and-read experiments using replaceable disposable fiber tips.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Rodolfo Martínez-Manuel, Óscar Esteban, Mikhail G. Shlyagin, "Simple low-cost refractometer using a disposable optical fiber tip for measurements," Optical Engineering 55(11), 116108 (22 November 2016). https://doi.org/10.1117/1.OE.55.11.116108 . Submission:
JOURNAL ARTICLE
5 PAGES


SHARE
RELATED CONTENT

Simple refractometer based on in-line fiber interferometers
Proceedings of SPIE (September 28 2015)
Fiber optic intrusion sensor
Proceedings of SPIE (September 24 1996)
Nested long period grating interferometers
Proceedings of SPIE (July 02 2007)
"White light" interferometry
Proceedings of SPIE (September 01 1990)

Back to Top