Method and apparatus for contactless acquisition of data for the

Details Method and apparatus for contactless acquisition of data for the Method and apparatus for contactless acquisition of data for the

1988-03-21

1991-01-22

McGraw, Vincent P.

Optics: measuring and testing

Optical pyrometers

2504581, 2504591, 356318, 356347, 374161, G01J 528, G01N 2164, G01B 9025

Patent

active

049866540

ABSTRACT:
Method and apparatus for contactless locally resolved instantaneous measurement of the density and/or temperature of a gas in a measurement volume which can have a relatively large area and a relatively small thickness, wherein by laser radiation two rotational transitions of a molecular constituent of the gas excitation in which the excited state has a life time which is substantially shorter than the reciprocal collision frequency in the gas, and wherein the fluorescence intensity or absorption corresponding to the two rotational transitions is measured. From the measured intensities the density and temperature can be calculated.

REFERENCES:
patent: 4081215 (1978-03-01), Penney et al.
patent: 4313057 (1982-01-01), Gelbwachs

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