Long path absorption cell

Details Long path absorption cell Long path absorption cell

1986-01-23

1988-06-07

Willis, Davis L.

Optics: measuring and testing

Sample, specimen, or standard holder or support

Fluid containers

250343, 356440, G01N 2109

Patent

active

047492767

ABSTRACT:
A small volume long path absorption cell of the White-type may be used with condensable samples. The absorption cell is temperature controlled and may be operated over a temperature range of -10 degrees C. to 80 degrees C. To prevent condensation of the sample on the mirror surfaces the mirrors are individually temperature controlled and maintained a few degrees above the ambient temperature of the absorption cell. The mirrors are mounted on an Invar framework which is cantilevered from one end of the cell so that variation of the path length due to thermal expansion is minimized. The cell temperature is controlled by a jacket having a heating or cooling fluid. The controls of the mirrors for the cell are adjustable from the exterior of the cell and the entrance paths for the mechanism are sealed so that the cell can be operated at both above and below atmospheric pressure.

REFERENCES:
patent: 1791254 (1931-02-01), Brockdorff
patent: 3906226 (1975-09-01), Okabe et al.
patent: 3944834 (1976-03-01), Chuan et al.
White, J. U., "Long Optical Paths of Large Aperture", J. Opt. Soc. Am., No. 32 (1942), pp. 285-288.
Eng, R. S. et al., "Tunable Diode Laser Measurement of Water Vapor Line Parameters in the 10 to 15 .mu.m Spectral Region", J. of Mol. Spectry., No. 74 (1979), pp. 388-399.
Baumeister, T. et al., Mark's Standard Handbook for Mechanical Engineers, 8th Ed., pp. 6-41.
Watkins, W. R. et al., "Automation of Long Path Absorption Cell Measurements," Rev. Sci. Instrum., No. 50 (1979), pp. 86-92.
Briesmeister, R. A. et al., "Long Path Length Temperature-Controlled Absorption Cell for Spectroscopic Studies of Radioactive Compounds", Applied Spectroscopy, No. 38 (1984), pp. 35-38.

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