Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1987-03-09
1989-07-25
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250340, 356316, G01N 2173
Patent
active
048516830
ABSTRACT:
A method and apparatus for element specific detection in chromatogragphic eluents. The apparatus is comprised of a radio frequency discharge between electrodes in helium, and utilizes a low-resolution plasma emission spectrometer to monitor selected spectral emissions produced when the helium discharge decomposes and excites the atomic constituents in chromatographic column effluents. The spectrometer is tuned to an atomic emission line in the near-infrared portion of the spectrum, and the emission intensity from the discharge region of a selected line is used to monitor the concentration of the element producing that line. Acceptable detector sensitivity is achieved by the use of a high-throughput optical system. Selectivity is achieved by a combination of correct line selection, plasma and carrier gas purification, and plasma gas doping.
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Farnsworth Paul B.
Lee Milton L.
Markides Karin E.
Skelton Jr. Ronald J.
Yang Frank J.
Brigham Young University
Hanig Richard
Howell Janice A.
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