The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2000
Filed:
Jun. 06, 1997
Joel A Brand, Colorado Springs, CO (US);
Garth A Monlux, Castle Rock, CO (US);
Patrick Zmarzly, Boulder, CO (US);
Gregory J Fetzer, Littleton, CO (US);
Benjamin C Halsted, Littleton, CO (US);
Kenneth W Groff, Littleton, CO (US);
Jamine Lee, Burlington, MA (US);
Neil Goldstein, Belmont, MA (US);
Steven Richtsmeier, Tewksbury, MA (US);
Fritz Bien, Concord, MA (US);
Monitor Labs, Inc., Englewood, CO (US);
Abstract
A method and apparatus for in situ measurement of the concentration of a gas with a frequency modulated tunable diode laser is disclosed. The sampling cell, which is mounted in the flow of gases to be measured, is a Herriott cell. Gas enters the sampling cell through sintered metal filters that prevent entrance of particulates. Signals from a sample detector and a null detector are compared to eliminate interference patterns from the laser optics. High accuracy dynamic calibration of the apparatus is also disclosed.