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1. WO2005108939 - CAVITY RINGDOWN SPECTROSCOPY WITH SWEPT-FREQUENCY LASER

Publication Number WO/2005/108939
Publication Date 17.11.2005
International Application No. PCT/AU2005/000683
International Filing Date 12.05.2005
Chapter 2 Demand Filed 13.12.2005
IPC
G01J 3/433 2006.1
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
3Spectrometry; Spectrophotometry; Monochromators; Measuring colours
28Investigating the spectrum
42Absorption spectrometry; Double-beam spectrometry; Flicker spectrometry; Reflection spectrometry
433Modulation spectrometry; Derivative spectrometry
G01N 21/39 2006.1
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
39using tunable lasers
H01S 3/105 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
105by controlling the mutual position or the reflecting properties of the reflectors of the cavity
CPC
G01J 3/42
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
3Spectrometry; Spectrophotometry; Monochromators; Measuring colours
28Investigating the spectrum
42Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
G01J 3/4338
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
3Spectrometry; Spectrophotometry; Monochromators; Measuring colours
28Investigating the spectrum
42Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
433Modulation spectrometry; Derivative spectrometry
4338Frequency modulated spectrometry
G01N 2021/391
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
39using tunable lasers
391Intracavity sample
G01N 21/3504
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
35using infra-red light
3504for analysing gases, e.g. multi-gas analysis
G01N 21/39
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
39using tunable lasers
Applicants
  • MACQUARIE UNIVERSITY [AU]/[AU] (AllExceptUS)
  • ORR, Brian, John [AU]/[AU] (UsOnly)
  • HE, Yabai [AU]/[AU] (UsOnly)
Inventors
  • ORR, Brian, John
  • HE, Yabai
Agents
  • SPRUSON & FERGUSON
Priority Data
200490251612.05.2004AU
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) CAVITY RINGDOWN SPECTROSCOPY WITH SWEPT-FREQUENCY LASER
(FR) SPECTROSCOPIE PAR TEMPS DE DECLIN DE CAVITE AVEC LASER A BALAYAGE DE FREQUENCE
Abstract
(EN) In a cavity ringdown spectrometer, a laser beam (12) is rapidly swept in frequency. When the frequency matches a resonant frequency of an optical cavity (20) formed between two highly reflective mirrors (16.1, 16.2) it is coupled into the cavity (20). Cavity-ringdown light is generated each time the frequency reaches a value that is resonant in the cavity. As the frequency reaches the value, the ringdown light builds up. As the frequency moves away from the value the ringdown light decays. A portion of the ringdown light is detected (38) and the rate of light decay is measured from the ringdown light signal. The variation of the rate of decay is attributable to a property of a sample that is in the cavity (20) between the mirrors (16.1; 16.2). A method of processing the ringdown light signal is also described. The arrangement allows rapid determination of the rates of decay of ringdown light at many frequencies for a single sample.
(FR) La présente invention a trait à un spectromètre à temps de déclin de cavité, dans lequel on effectue un balayage rapide d'un faisceau laser (12) en fréquence. Lorsque la fréquence correspond à une fréquence de résonance d'une cavité optique (20) formée entre deux miroirs hautement réfléchissants (16.1, 16.2), elle est couplée dans la cavité (20) Une lumière à temps de déclin de cavité est générée chaque fois que la fréquence atteint une valeur qui est résonante dans la cavité. Au fur et à mesure que la fréquence atteint la valeur, la lumière à temps de déclin monte en puissance. Au fur et à mesure que la fréquence s'éloigne de la valeur, la lumière à temps de déclin se détériore. Une portion de la lumière temps de déclin est détectée (38) et le taux de détérioration est mesurée à partir du signal de la lumière à temps de déclin. La variation du taux de détérioration de la lumière à temps de déclin est attribuable à une propriété d'échantillon se trouvant dans la cavité (20) entre les miroirs (16.1, 16.2). L'invention a également trait à un procédé de traitement de signal de la lumière à temps de déclin. L'agencement permet la détermination rapide des taux de détérioration de la lumière à temps de déclin à plusieurs fréquences pour un unique échantillon.
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