Andros Incorporated

Microsoft Corporation

Steven Drucker

Donald James Lindsay

Kentaro Toyama

Blaise Aguera Y Arcas

Stephen L Lawler

Gary W Flake

Karim Farouki

Brett D Brewer

Jeffrey Jon Weir

Ariel J Lazier

Kevin G Williams

Tomasz Kasperkiewicz

Adam Sheppard

Davood Khalili

Emery Major

Ken Christensen

Alexey Goder

Richard Stephen Szeliski

Julio Estrada

Henry Sowizral

An improved apparatus and method for measuring the concentration of carbon dioxide in respiratory gases. The apparatus is a non-dispersive gas analyzer attached in series with the respiratory airway which is universally compatible with any host system. The analyzer includes a housing which supports a sample cell containing the respiratory gases, and which contains an infrared radiation source encased in shock absorbing material, means for directing the radiation into a collimated beam path through the sample cell, means for splitting the beam path and directing it towards a pair of infrared detectors for measuring the amount of absorption of carbon dioxide in the sample cell. The analyzer is further improved by the use of two heating servos, one for regulating the temperature of the sample cell windows in order to inhibit condensation build-up and one for regulating the ambient temperature surrounding the detectors so as to ensure more accurate measurements. Calibration means is included within the analyzer housing for storing and providing information characterizing performance parameters of the analyzer.

Respiratory gas analyzer

Growing community of inventors

Oakland, CA, United States of America

Steven Drucker