Abstract

In situ measurements of the fluorescence spectra,intensity, and response time were made at elevated temperatures(∼500 °C) for samples of Cu-ZSM-5 exposed to dilute mixturesof O₂ in N₂ and to variousO₂-reductant combinations in N₂. Theresults of these experiments are interpreted with a physical model ofthe oxidation/reduction kinetics of the copper ions. Thefluorescence signal depends strongly on the gas composition, providinga mechanism for a gas composition sensor. A prototype sensorconfiguration is described that uses a visible (488-nm) excitationsource and a fiber-optic geometry to generate and detect thefluorescence. The results indicate that for a weakly reducing gasthe fluorescence signal correlates well with the oxygen concentration,whereas for strongly reducing gases the signal correlates more closelywith the reductant-to-oxidant ratio.

© 1997 Optical Society of America

Demonstration of a high-temperature fiber-optic gas sensor made with a sol-gel process to incorporate a fluorescent indicator

Jeffrey T. Remillard, Jeffrey R. Jones, Ben D. Poindexter, Chaitanya K. Narula, and Willes H. Weber
Appl. Opt. 38(25) 5306-5309 (1999)

Synthesis of MFI zeolite films on optical fibers for detection of chemical vapors

Hai Xiao, Jian Zhang, Junhang Dong, Ming Luo, Robert Lee, and Van Romero
Opt. Lett. 30(11) 1270-1272 (2005)

Ratio fluorescence sensor based on CD/Cu-MOFs for detection of Hg²⁺

Jingzhou Hou, Ya Zhang, Fanglin Ming, Yiyihui Hong, Huan Liu, Qiang He, Changjun Hou, and Danqun Huo
Appl. Opt. 62(6) A127-A136 (2023)

Optical fluorescent sensor based on perovskite QDs for nitric oxide gas detection

Divyanshu Kumar, Rispandi Mesin, and Cheng-Shane Chu
Appl. Opt. 62(12) 3176-3181 (2023)

Zeolite Thin Film-Coated Long Period Fiber Grating Sensor for Measuring Trace Chemical

Jian Zhang, Xiling Tang, Junhang Dong, Tao Wei, and Hai Xiao
Opt. Express 16(11) 8317-8323 (2008)