公开(公告)号：FR2713770A1

公开(公告)日：1995-06-16

申请号：FR9314856

申请日：1993-12-10

Applicant: SEXTANT AVIONIQUE

Inventor： HENRI FIMA

IPC: G01K11/20 ,  G01L11/02 ,  G01N21/64

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.

公开(公告)号：FR2658607A1

公开(公告)日：1991-08-23

申请号：FR9002180

申请日：1990-02-22

Applicant: SEXTANT AVIONIQUE

Inventor： HENRI FIMA

IPC: G01K11/20 ,  G01S7/481 ,  G01S17/95

Abstract: Using a laser generator and by excitation of energy band transitions of molecular oxygen, the fluorescence of oxygen is caused, the intensities of the induced fluorescence in two different bands is measured, the ratio between these intensities is determined and the temperature is derived from this. Over a section of significant depth (c[ tau + tau ']/2), two absorption lines (R, R') are excited which at least overlap and which respectively belong to two different Schumann-Runge bands of oxygen. The transmission line (L) of the laser generator has a very small width in comparison with that of the absorption lines and its central frequency ( omega o/2 pi ) is adjusted to be substantially in the vicinity of the maxima of the two absorption lines (R, R'). … …

公开(公告)号：FR2658608A1

公开(公告)日：1991-08-23

申请号：FR9002181

申请日：1990-02-22

Applicant: SEXTANT AVIONIQUE

Inventor： HENRI FIMA

IPC: G01L11/02 ,  G01N21/47

Abstract: Using a laser generator generating a very fine line Po and by excitation of an absorption line (R) of molecular oxygen, back-scattered radiation is caused, the back-scattered energies at two different distances are measured, the ratio of these energies is determined and an absorption coefficient, which is a function of the temperature and the molecular density of oxygen, is derived from this and, having determined the temperature of the air, the density, and therefore the pressure, is computed. The absorption line R belonging to a Schumann-Runge band of molecular oxygen is excited and the absorption line R is very wide with respect to the Rayleigh diffusion spectrum.

公开(公告)号：FR2713768A1

公开(公告)日：1995-06-16

申请号：FR9314855

申请日：1993-12-10

Applicant: SEXTANT AVIONIQUE

Inventor： HENRI FIMA

IPC: G01K11/20 ,  G01J5/00

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.

公开(公告)号：FR2689627A1

公开(公告)日：1993-10-08

申请号：FR9204520

申请日：1992-04-07

Applicant: SEXTANT AVIONIQUE

Inventor： HERVE BARNY ,  HENRI FIMA ,  MICHEL TORREGROSA

IPC: G01D3/06 ,  G01L1/08 ,  G01L11/00 ,  G01P15/13 ,  G01D5/12 ,  G01L9/12 ,  G01P15/08