Folded-path optical analysis gas cell

Details Folded-path optical analysis gas cell Folded-path optical analysis gas cell

1994-02-25

1995-08-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356246, G01N 1506

Patent

active

054401437

ABSTRACT:
A folded-path gas cell employs an elliptical concave mirror in confronting relationship to two substantially spherical concave mirrors. At least one of the spherical mirrors, and usually both, are formed with an added cylindrical component to increase orthogonal focii coincidence and thereby to increase the radiation energy throughput characteristic of the cell.

REFERENCES:
patent: 4657397 (1987-04-01), Oehler et al.
patent: 4749276 (1988-06-01), Bragg et al.
"Long Optical Paths of Large Aperture" by John U. White--J. Opt Soc. Am., No. 32 (1942) pp. 285-288.

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