Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
1999-09-17
2001-11-13
Rosenberger, Richard A. (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C250S338500
Reexamination Certificate
active
06317212
ABSTRACT:
BACKGROUND
The present invention relates generally to measuring the concentration of gases and/or vapor in a sample and more particularly to measuring the concentration of carbon dioxide and water vapor in the air.
One type of gas analyzer utilizes a light source that projects a beam of light through a sample and a detector to detect the light after passing through the sample. These gas analyzers typically use a combination of sample filters and a single reference filter to analyze certain wave lengths of light. The concentrations of gases in the sample can be determined by examining the degree to which the certain wave lengths of light are absorbed by the sample. However, by using a single reference filter in conjunction with two or more sample filters, the accuracy of the measurements associated with the two sample filters may be decreased. In this analyzer, the filters are typically placed between the sample and the detector. However, this placement of the filters in relation to the source may render the analyzer more susceptible to drift, artifacts, and the like, which may reduce the accuracy of the analyzer.
Further, to measure the concentrations of gases in air, one type of gas analyzer utilizes an open air measuring chamber. This type of analyzer typically includes a source that produces light, a detector to receive the light, an a pair of mirrors that reflect the light to direct it from the source to the detector. When these mirrors are used in an open air measuring chamber, they are exposed to the environment and are subject to contamination that can effect the accuracy of the analyzer. Therefore, an analyzer that overcomes these deficiencies is needed.
REFERENCES:
patent: 3696247 (1972-10-01), McIntosh et al.
patent: 4013260 (1977-03-01), McClatchie et al.
patent: 4567366 (1986-01-01), Shinohara
patent: 4569589 (1986-02-01), Neufeld
patent: 5340987 (1994-08-01), Eckles et al.
Jones et al., A Fast Response Atmospheric CO2Sensor for Eddy Correlation Flux Measurements,Atmospheric Environment, vol. 12, pp. 845-851, Pergamon Press Ltd. 1978.
Bingham et al., Development of a Miniature, Rapid-Response Carbon Dioxide Sensor, Progress Report from the NSF Ecosystem Program, The National Science Foundation, (Project DEB 77-16327), Mar. 20, 1978.
Brach et al., Open Path CO2Analyser,The Institute of Physics, vol. 6, pp. 1415-1419, 1981.
Altmann et al., Two-Mirrow Multipass Absorption Cell,Applied Optics, vol. 20, No. 6, pp. 995-999, Mar. 15, 1981.
Heikinheimo et al., An Open Path, Fast Response IR Spectrometer for Simultaneous Detection of CO2and Water Vapor Fluctuations,Journal of Atmospheric and Oceanic Technology, vol.6, pp. 624-636, Aug. 1989.
Bingham et al., Fast-Response Sensors for Eddy Covariance Measurements of CO2and Other Middle Infrared Absorbing Gases, Private Communication, not dated.
Bingham, Gail E., A Miniature Rapid Response Sensor for Atmospheric Concentrations of Carbon Dioxide, Private Communication, not dated.
Ohtaki, Eiji and Matsui, Tetuji, Infrared Device for Simultaneous Measurement of Fluctuations of Atmospheric Carbon Dioxide and Water Vapor,Boundary-Layer Meterology24 (1982) 109-119.
Auble, David L. and Meyers, Tilden P., An Open Path, Fast Response Infrared Absorption Gas Analyzer for H2O and CO2,Boundary-Layer Meterology 59: 243-256, 1992.
Internet Web page entitled Infrared Gas Analyzer, www.atdd.noaa.gov/irga/irga.htm, Jul. 6, 1999.
Internet Web page entitled Advance Optima Infrared Analyzer Module Uras 14, www.hub.de/world/analyse/en/optima/p-aui-01.htm, Jul. 9, 1999.
Internet Web page entitled Dynamax Inc.—ADC 2250 Series, www.dynamax.com/adc.htm, Jul.9, 1999.
Internet Web page entitled Infra-Red Gas Analysis Systems CIRAS-1, CIRAS-2 SC & DC, www.ppsystems.com/gas2.html, Jul. 9, 1999.
Internet Web page entitled Gas Analysis Ultramat 6, www3.ad.siemens.de/ca01cache/en-3000133-b-tab0-IE4.htm, Jul. 9, 1999.
Internet Web page entitled Gas Analysis Ultramat 23, www3.ad.siemens.de/ca/01cache/en-3000134-b-tab0-IE4.htm, Jul. 9, 1999.
Internet Web page entitled Gas Analysis Ultramat 5F-Ex u. 5F-2R-Ex, www3.ad.siemens.de/ca01cache/en-3000137-b-tab0-IE4.htm, Jul. 9, 1999.
Internet Web page entitled Gas Analysis Ultramat/Oxymat 6, www3.ad.siemens.de/ca01cache/en-3000154-b-tab0-IE4.htm, Jul. 9, 1999.
Brinks Hofer Gilson & Lione
Li-Cor Inc.
Rosenberger Richard A.
White Jason C.
LandOfFree
Gas analyzer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas analyzer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas analyzer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2592331