Double beam detector system for liquid chromatography

Details Double beam detector system for liquid chromatography Double beam detector system for liquid chromatography

1991-08-28

1992-12-22

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

250373, 356435, 356440, G01J 342, G01N 2131

Patent

active

051737426

ABSTRACT:
A double beam detector system for liquid chromatography includes a light source and slits to effect two beams of radiation symmetrical to an optical axis and focused through a common point. A concave reflective dispersion grating is disposed on the optical axis which is folded at the grating. A collimating lens directs the beams parallel to the optical axis into a pair of detector cells. The collimating lens and entrance lenses for the cells are selected so that the common point is imaged on exit windows of the cells. The grating has a curvature selected cooperatively with the collimating lens, entrance lenses and relevant distances so as to focus the entrance slits at respective entrance windows for the cells. The beam size is constricted to less than the cell bore size by selected parameters of the collimating lens and the entrance lenses.

REFERENCES:
patent: 3516752 (1970-06-01), Hrdina
patent: 3591801 (1971-07-01), Watson
patent: 3614242 (1971-10-01), Hrdina
patent: 3792929 (1974-02-01), Alpert
patent: 3795450 (1974-03-01), Munk
patent: 4011451 (1977-03-01), Nelson
patent: 4037974 (1977-07-01), Fletcher et al.
patent: 4094609 (1978-06-01), Fujii et al.
patent: 4886356 (1989-12-01), Paradis
Mathematics of Statistics, Kenney & Keeping, Van Nostrand Co. Inc., Princeton, N.J. (2nd ed 1959, pp. 59-60).

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