Chemistry: analytical and immunological testing – Measurement of electrical or magnetic property or thermal... – Of an ionized gas
Patent
1989-12-04
1991-12-10
Warden, Robert J.
Chemistry: analytical and immunological testing
Measurement of electrical or magnetic property or thermal...
Of an ionized gas
250282, 250287, G01N 2171
Patent
active
050717715
ABSTRACT:
A method and apparatus to produce an ion mobility signature representing a wood sample provides a method of comparing signatures to identify the species of the wood sample. A method of producing an ion drift time signature representing a wood species comprises heating at least a portion of a wood sample at a temperature in the range of about 220.degree. to 350.degree. C. to desorb and produce trace vapors from the wood sample, ionize the trace vapors at a temperature in the range of about 220.degree. to 350.degree. C., pulse ions through a gate into a drift region, measure the time of arrival of the ions and the ion flux for each pulse, with a collector electrode, located at the end of the drift region to produce an ionic signal, and amplify and average the ionic signal to provide an ion drift time signature for the wood sample.
REFERENCES:
patent: 4000406 (1988-01-01), Wohltjen
patent: 4551624 (1985-12-01), Spangler et al.
Journal of Wood Chemistry and Tech. 3(4), 377-397 (1983) John R. Obst.
Rapid Characterization of Wood Species by Ion Mobility Spectrometer, A. H. Lawrence-Published Feb. 2, 1989 at 75th Annual Meeting of the Technical Section of the C.P.P.A.
Abstract-Use of Ion Mobility Spectrometry for Rapid Identification of Wood Species by R. J. Barbour & A. H. Lawrence, Jun. 19-22, 1988-42nd Annual Meeting of the Forest Products Research Society in Quebec, Canada.
Textbook of Wood Technology, Third Edition, published by McGraw-Hill, Authors: A. J. Panshin & Carl De Zeeow, pp. 419 to 421.
Barbour R. James
Danylewych-May Ludmila L.
Sutcliffe Roger
Collins Laura E.
Forintek Canada Corporation
James William H.
Warden Robert J.
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