Miniature devices useful for gas chromatography

Details Miniature devices useful for gas chromatography Miniature devices useful for gas chromatography

1989-03-29

1990-06-19

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55208, 55270, 55386, 73 2322, 2101983, B01D 1508, G01N 3066

Patent

active

049350404

ABSTRACT:
Laminated wafers with channels formed therein define a plurality of gas chromatographic columns in a body, with substantially minimal connecting channels between an injector and a detector. One or more of the columns at a time is selected by valve to be receptive of sample gas. Detector and injector cavities have surfaces with the adsorbent phase utilized in the column being further coated on the surfaces, whereby the detector and injector constitute an integral portion of the gas chromatographic column. A channel is formed between wafers each with grooves that have semicircular cross sections so as to form the channel with a circular cross section. A digital gas injector includes a plurality of chambers with respective measured volumes. Valves select one or more of the chambers at a time to be receptive of sample gas from the common inlet. A detector comprises a body having a passage therein receptive of a first flow consisting of a sample gas mixed into a carrier gas, and alternatively receptive of a second flow consisting of a reference gas. Preferably the first and second flows are oppositely directed by valves alternatively through the passage. Boron or silicon nitride film is utilized in cavities in the body so as to provide a structural component for membranes of the valves and for hot wire detectors.

REFERENCES:
patent: 3138948 (1964-06-01), Pfefferle
patent: 3146616 (1964-09-01), Loyd
patent: 3149941 (1964-09-01), Barnitz et al.
patent: 3319403 (1967-05-01), Rose et al.
patent: 3449938 (1969-06-01), Giddings
patent: 3503712 (1970-03-01), Sussman
patent: 3538744 (1970-11-01), Karasek
patent: 3630006 (1971-12-01), Sandoval
patent: 3748833 (1973-07-01), Karas et al.
patent: 3856681 (1974-12-01), Huber
patent: 4116836 (1978-09-01), DeAngelis
patent: 4142400 (1979-03-01), Colla et al.
patent: 4394263 (1983-07-01), Dosch et al.
patent: 4471647 (1984-09-01), Jerman et al.
patent: 4575424 (1986-03-01), Allington et al.
"A Prototype Gas Analysis System Using a Miniature Gas Chromatograph" by J. H. Jerman, S. C. Terry and S. Saadat, Stanford University, Jun. 2, 1980.
"Silicon as a Mechanical Material" by K. E. Peterson, Proc. IEEE 70, 420-457, May 1982.
"A Microminiature Electric-to Fluidic Valve" by M. J. Zdeblick and J. B. Angell, Transductors 87, pp. 827-829 (1987).
"Boron Nitride Mask Structure for X-Ray Lithography" by D. Maydan, G. A. Coguin, H. J. Levinstein, A. K. Sinha and D. N. K. Wang, J. Vac. Sci Technol 16 1959-61 (Nov./Dec.) 1979.

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