Patent Number: 6,251,342

Title: Fluorescent fiber optic sensor element fabricated using sol-gel processing techniques

Abstract: The invention is a fluorescent sensor element for detecting concentration changes of oxygen in an atmosphere suitable for high temperature applications such as automotive exhaust gases. It comprises an optical fiber, preferably silica, coated on at least a portion of its surface with a sol-gel processed porous uniform mixture of (1) matrix material of alumina, zirconia, titania, or silica or a mixture of any of them with (2) ceramic fluorescent indicator like Cu-ZSM-5 zeolite incorporated therein. In use of the sensor element in a system, a light source excites fluorescence in the indicator which is responsive to varying oxygen concentration in the contacted exhaust gas.

Inventors: Narula; Chaitanya Kumar (Ann Arbor, MI), Poindexter; Bennie (Westland, MI), Remillard; Jeffrey Thomas (Ypsilanti, MI), Weber; Willes Henry (Ann Arbor, MI)

Assignee: Ford Global Technologies, Inc.

International Classification: G01N 21/77 (20060101); G01N 021/64 ()

Expiration Date: 06/26/2018