Measuring and testing – Gas analysis – By vibration
Patent
1993-06-30
1995-11-14
Noland, Thomas P.
Measuring and testing
Gas analysis
By vibration
364498, G01N 2902
Patent
active
054656087
ABSTRACT:
A method and apparatus for the identification and quantification of a vapor, or a number of vapors, in air mixtures is discussed. The method includes calibration of a vapor responsive sensor, or a plurality of vapor responsive sensors, to known concentrations of the vapors of interest or to known concentrations of potential interfering vapors. The calibrations result in sensor response vectors which are derived from the transient signals observed as the vapors are sorbed and desorbed on the sensors. Detection of vapors in complex mixtures is effected by subjecting the apparatus to the mixture and measuring the sensor response, or plurality of sensor responses, and then applying multidimensional statistical analysis or filtering methods to this data, using the precalibrated response vectors as the basis set for deconvolution. The sensors disclosed are Surface Acoustic Wave sensors (SAWs), and include variations of temperature programmed SAWs, SAWs with various combinations of chemically selective coatings, and arrays of temperature programmed and coated SAWs.
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Susan L. Rose-Pehrsson, Jay W. Grate, David S. Ballantine, Jr. and Peter C. Jurs, "Detection of Hazardous Vapors Including Mixtures Using Pattern Recognition Analysis of Responses from Surface Acoustic Wave Devices," Anal. Chem. 1988 60 pp. 2801-2811.
Burchfield David E.
Lokshin Anatole
Tracy David H.
Noland Thomas P.
Orbital Sciences Corporation
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