Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1989-08-30
1991-04-23
Arnold, Bruce Y.
Optics: measuring and testing
Range or remote distance finding
With photodetection
350622, 356437, 356439, 356440, 356442, 356246, G02B 508, G01N 2100
Patent
active
050094939
ABSTRACT:
The invention is directed to a mirror arrangement for a beam path in a multiple-reflection cell for measuring the absorption of light in a measuring gas. In the measuring arrangement, an entrance aperture is imaged on an exit aperture via an entrance aperture mirror, a field mirror and an exit aperture mirror. This arrangement is improved in that the astigmatism of the imaging error is considerably reduced. For this purpose, the form of the aperture mirrors is approximately defined by an ellipsoid wherein the focal point spacing is approximately equal to half the distance between the entrance aperture and the exit aperture.
REFERENCES:
patent: 2729143 (1956-01-01), White
patent: 3748014 (1973-07-01), Beiser
Shimizu et al.; "Stark Spectroscopy by 10-.mu. Lasers Using a Multipath Cell"; Journal of Applied Physics; vol. 46, No. 1, Jan. 1975, pp. 258-259.
"Minimization of Volume and Astigmatism in White Cells for Use with Circular Sources and Apertures" by W. Bruce Olson, Applied Optics, vol. 23, No. 10, May 15, 1984, pp. 1580-1585.
Koch Edmund
Pruss Dieter
Arnold Bruce Y.
Dragerwerk Aktiengesellschaft
Ottesen Walter
Shafer R. D.
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