Method and apparatus for the optical measurement of the temperature of a gaseous mixture
First Claim
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1. A method for optically determining the temperature of a gaseous mixture, which method comprises:
- exciting, in the infrared range, the molecules of a gas of said mixture, from a first vibrational level to a second vibrational level;
allowing the rotational relaxation of said molecules between the different rotational sub-levels of said second vibrational level;
measuring the ratio of the populations of molecules located at two of said rotational sub-levels; and
deducing from said ratio the temperature of the gaseous mixture.
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Abstract
Method and apparatus for the optical determination of the temperature of a gaseous mixture, the method comprising the stages consisting:
of exciting in the infrared range the molecules of a gas of said mixture, from a first vibrational level towards a second vibrational level;
of allowing the rotational relaxation of said molecules between the different rotational sub-levels of said second vibrational level;
of measuring the ratio of the populations of molecules located at two of said rotational sub-levels; and
of deducing from said ratio the temperature of the gaseous mixture.
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16 Claims
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1. A method for optically determining the temperature of a gaseous mixture, which method comprises:
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exciting, in the infrared range, the molecules of a gas of said mixture, from a first vibrational level to a second vibrational level; allowing the rotational relaxation of said molecules between the different rotational sub-levels of said second vibrational level; measuring the ratio of the populations of molecules located at two of said rotational sub-levels; and deducing from said ratio the temperature of the gaseous mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for the optical determination of the temperature of a gaseous mixture, comprising:
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measuring the ratio of intensity of fluorescence of two lines of the emission spectrum of a gas of said mixture, whereof the molecules of the gaseous mixture have previously been excited in the infrared range at two different energy states; deducing from this ratio the ratio of the populations of said states; and deducing said temperature from said ratio of populations. - View Dependent Claims (11, 12, 13, 14)
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15. An apparatus for optically measuring the temperature of a gaseous mixture, which apparatus comprises:
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a laser able to excite the molecules of a gas of said mixture in the infrared range from a first to a second vibrational level and allowing rotational relaxation of molecules between different rotational sub-levels; detection means for measuring the intensity of fluorescence of two lines of the emission spectrum of said gas from two rotational sub-levels of said second vibrational level; means for deducing a ratio of populations of different energy states from a ratio of the intensities; and calculation means for determining said temperature from said ratio of populations. - View Dependent Claims (16)
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Specification