Evanescent wave sensor using cellulose nanocrystals composite fiber coating for humidity measurement

Chun-Yen Hsieh; Chun-Da Liao; Wei-Chih Wang

doi:10.1117/12.2545580

20 February 2020 Evanescent wave sensor using cellulose nanocrystals composite fiber coating for humidity measurement

Chun-Yen Hsieh, Chun-Da Liao, Wei-Chih Wang

Proceedings Volume 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX; 1123302 (2020) https://doi.org/10.1117/12.2545580
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

A novel concept of optical-fiber humidity sensor using cellulose nanocrystals (CNC) composite fiber using electrospinning is presented. The humidity sensor measures relative humidity based on the effective refractive index change due to water vapor absorption. A simple evanescent detection scheme is set up for the fiber sensor where evanescent absorbance can be measured directly proportional to the vapor concentration and the effective fraction of the total guided power in the sensing region of the fiber. Due to cellulose’s high affinity to water, the sensor should exhibit relatively high sensitivity compare to non-cellulose based sensor. In this report, both fabrication of the sensor and experiment will be presented.

Citation Download Citation

Chun-Yen Hsieh, Chun-Da Liao, and Wei-Chih Wang "Evanescent wave sensor using cellulose nanocrystals composite fiber coating for humidity measurement", Proc. SPIE 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX, 1123302 (20 February 2020); https://doi.org/10.1117/12.2545580

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