Abstract
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 (), 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 .
© 2016 Optical Society of America
Full Article | PDF ArticleMore Like This
Chuji Wang and Susan T. Scherrer
Appl. Opt. 43(35) 6458-6464 (2004)
Ce Bian, Manli Hu, Ruohui Wang, Tingting Gang, Rongxin Tong, Lisong Zhang, Teng Guo, Xiaobo Liu, and Xueguang Qiao
Appl. Opt. 57(2) 356-361 (2018)
Bang Ning Mao, Wen Wei Chen, Chun Liu Zhao, Yan Shi, Chang Yu Shen, and Shang Zhong Jin
Appl. Opt. 59(19) 5693-5696 (2020)