Title: Convergent light illuminated flow cell for liquid chromatography

Abstract: Single and dual beam flow cells for liquid chromatography that provide good detectability and linear response with small sample volumes. A cylindrical window surrounds the sample flow path to permit focusing convergent light rays through the center of the flow path and along optical paths of equal length through the cell. Optical stops limit the light passing through the cell to convergent rays incident to the window surface. A wide acceptance angle for the rays results in high light transmission and averages variations in light output along the light source. A dual beam flow cell utilizes a common exit for the sample and reference liquids. The flow cells are economically constructed for direct coupling to a chromatographic column by using a standard compression fitting union and can be used in a single wavelength or discrete wavelength detector, or in a spectrophotometer.

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Inventors: Munk, Miner N. (Walnut Creek, CA, US)

Application Number: 490548
Filing Date: 1974-07-22
Publication_date: 1976-08-17
Assignee: Varian Associates (Palo Alto, CA)
Primary Class(es): 356/246 250/576
Other Classes:
US Patent Ref:

2730004	Jan, 1956	Badger et al.	356/246.
3531211	Sep, 1970	Staunton	356/246.
3614242	Oct, 1971	Hrdina	356/246.
3652170	Mar, 1972	Beer et al.	250/576.
3794428	Feb, 1974	Giesecke	356/244.

Other Refs:
Primary Examiner: McGraw, Vincent P.
Assistant Examiner: Henry, Jon W.
Attorney: Cole; Stanley Z., Fisher; Gerald M., Morrissey; John J.