Introduction to OzoneInstrumentation and Analysis
Nate Herbst,
Southern Ute Indian Tribe
Joe Hameed, ITEP/TAMS
2
Intro to Instruments and Analysis
• What type of instrumentation is used?• What type of analysis is employed?• How is the analysis performed?• How does the analyzer work?
3
Ozone Analyzer Basics
• Design based on U.V absorption• U.V photometry [O3]
Some pictures of the Thermo 49C
4
Theory of Analysis
• Ozone absorbs 240nm U.V radiation• Dual cell technique ambient and zero
absorptions• Zero and ambient absorptions compared• Ozone concentration = ambient absorption –
zero absorption
5
U. V. Photometric Absorption
• Remember: ozone absorbs U.V.
Ozone absorbing U.V radiation.
Animation by NASA.
Zero air Ambient airU.V. Lamp Detector
Amount of U.V light leaving cell #1 corresponds to [O3]
Amount of U.V light leaving cell #2 provides your blank
Photo courtesy of University of
Wisconsin General Chemistry Class.
6
Ozone Analyzer Optical System (Thermo Env. 49C)