Method and apparatus for the optical measurement of the pressure of a gaseous mixture
First Claim
Patent Images
1. Method for the optical determination of the pressure of a gaseous mixture, characterized by the fact that it comprises the stages consisting:
- of exciting in the infrared range the molecules of a gas of said mixture, from a first vibrational level to a second vibrational level;
of measuring the duration of the fluorescence of a line of the emission spectrum of said gas from one of the rotational sub-levels of said second vibrational level towards another rotational sub-level of a third vibrational level; and
of deducing from said duration the pressure of the gaseous mixture.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for the optical determination of the pressure of a gaseous mixture includes the steps of exciting in the infrared range the molecules of a gas of the mixture, from a first vibrational level towards a second vibrational level, measuring the duration of the fluorescence of a line of the emission spectrum of the gas from one of the rotational sub-levels of the second vibrational level towards another rotational sub-level of a third vibrational level, and deducing from the duration the pressure of the gaseous mixture.
-
Citations
9 Claims
-
1. Method for the optical determination of the pressure of a gaseous mixture, characterized by the fact that it comprises the stages consisting:
-
of exciting in the infrared range the molecules of a gas of said mixture, from a first vibrational level to a second vibrational level; of measuring the duration of the fluorescence of a line of the emission spectrum of said gas from one of the rotational sub-levels of said second vibrational level towards another rotational sub-level of a third vibrational level; and of deducing from said duration the pressure of the gaseous mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. Apparatus for the optical measurement of the pressure of a gaseous mixture, characterized by the fact that it comprises:
-
a laser (1) able to excite the molecules of a gas of said mixture in the infrared range from a first to a second vibrational level; detection means (11) for detecting the fluorescence of a line of the emission spectrum of said gas from one rotational sub-level of said second vibrational level; means (16) for determining the duration of said fluorescence; and means (16) for deducing the pressure of the gaseous mixture from said duration of fluorescence.
-
Specification