Patent ID: 8836945
Filing Date: 2014-09-16
Classification: G01N

Abstract:
1. A method of a detecting a change in a chemical composition of a gas stream comprising: contacting a conducting oxide material with some portion of the gas stream, where the some portion of the gas stream has a gas stream temperature, and where the gas stream temperature is at least 100° C., and where the conducting oxide material comprises a conducting metal oxide, where the conducting metal oxide has a carrier concentration of at least 10 illuminating the conducting metal oxide with a light source emitting incident light; collecting exiting light, where the exiting light is light that originates at the light source and is transmitted, reflected, scattered or a combination thereof by the conducting metal oxide; monitoring an optical signal based on a comparison of the incident light and the exiting light using optical spectroscopy; and detecting a shift in the optical signal, thereby detecting the change in the chemical composition, and thereby monitoring the chemical composition of the gas stream.