Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
356246, G01N 1506
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.
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.
Carangelo Robert M.
Wright David D.
Dorman Ira S.
Nelms David C.
On-Line Technologies, Inc.
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