Open AccessFiber loop ringdown humidity sensor
Author(s) -
Haifa Alali,
Chuji Wang
Publication year - 2016
Publication title -
applied optics
Language(s) - Uncategorized
Resource type - Journals
ISSN - 0003-6935
DOI - 10.1364/ao.55.008938
Subject(s) - materials science , optics , humidity , fiber optic sensor , optical fiber , relative humidity , refractive index , fiber , reproducibility , hygrometer , optoelectronics , physics , chemistry , composite material , meteorology , chromatography
An optical fiber relative humidity (RH) sensor based on the evanescent field-fiber loop ringdown (EF-FLRD) technique is demonstrated. The sensor was placed inside a chamber that provides a humidity reference and is monitored by a humidity meter. The presence of moisture in the chamber changes the refractive index of the medium; thus the ringdown time changes due to a change in the EF scattering loss induced in the sensor head. The sensor demonstrated a fast response (∼1 s), high sensitivity, and excellent reproducibility and reversibly. The EF-FLRD sensor can measure RH in a wide dynamic range of 4% to 100% at a constant temperature of 20±1°C.