Abstract

A new porous glass optical fiber has been developed for use as a sensor for the detection of ammonia vapors at low concentrations. The porous structure that remains after selective heat treatment, phase separation, and chemical leaching of a borosilicate glass imparts a high surface area to the fiber core. Ammonia vapors permeating into the porous zone, which is pretreated with a reversible pH dye indicator, produce a spectral change in transmission. The resulting pH change is measured by in-line optical absorbance and is proportional to the ambient-ammonia concentration. Ammonia-vapor concentrations as low as 0.7 part in 10⁶ have been detected.

© 1988 Optical Society of America

Porous plastic optical fiber sensor for ammonia measurement

Quan Zhou, David Kritz, Laura Bonnell, and George H. Sigel
Appl. Opt. 28(11) 2022-2025 (1989)

Reversible optical waveguide sensor for ammonia vapors

J. F. Giuliani, H. Wohltjen, and N. L. Jarvis
Opt. Lett. 8(1) 54-56 (1983)

High sensitivity sol-gel silica coated optical fiber sensor for detection of ammonia in water

Dejun Liu, Wei Han, Arun Kumar Mallik, Jinhui Yuan, Chongxiu Yu, Gerald Farrell, Yuliya Semenova, and Qiang Wu
Opt. Express 24(21) 24179-24187 (2016)

Fabrication of three-dimensional zinc oxide nanoflowers for high-sensitivity fiber-optic ammonia gas sensors

Yi Zhu, Haiwei Fu, Jijun Ding, Huidong Li, Min Zhang, Jingle Zhang, and Yinggang Liu
Appl. Opt. 57(27) 7924-7930 (2018)

Fabrication and calibration of Oxazine-based optic fiber sensor for detection of ammonia in water

Ahmed Hasnain Jalal, Jinsong Yu, and A. G. Agwu Nnanna
Appl. Opt. 51(17) 3768-3775 (2012)