Gas exchange system flow configuration with thermally insulated sample chamber

US8692202B2 · kind B2 · utility

Assignee

• LI-COR, Inc. · US

Inventors

• Mark A. Johnson · Austin, US
• Andrew S. Parr · Lincoln, US
• Robert D. Eckles · Malcolm, US

Key dates

• Filing date: May 31, 2011
• Grant date: Apr 8, 2014
• Expiry date: Oct 12, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2021/8466
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

System flow path designs that minimize the impact of gas diffusion sources and sinks. By reducing the magnitude of parasitic sources and sinks, lower rates of photosynthesis and transpiration can be more accurately measured, e.g., without the need for extensive empirical compensation. The gas exchange analysis system includes a sample chamber having an inlet and an outlet, wherein the internal surface(s) of the chamber defining the measurement volume are metal plated. The system also typically includes a source of gas coupled with the inlet of the sample chamber, and a gas analyzer coupled with the outlet of the sample chamber and configured to measure a concentration of one or more gases exiting the chamber, whereby the metal plated internal surface(s) of the chamber reduces sorption of the one or more gases within the chamber.