Method of identifying and detecting the concentrations of multiple species by means of a spectrophone

a technology of spectrophones and concentrations, applied in the direction of response signal detection, ultrasonic/sonic/infrasonic wave generation, analysis fluids using sonic/ultrasonic/infrasonic waves, etc., can solve the problem of requiring more time for species identification

Inactive Publication Date: 2005-09-29
CRANE ROBERT ANTHONY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, measurement of multiple species cannot be carried out simultaneously and consequently requires more time for the species to be identified and their concentrations determined.

Method used

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  • Method of identifying and detecting the concentrations of multiple species by means of a spectrophone
  • Method of identifying and detecting the concentrations of multiple species by means of a spectrophone
  • Method of identifying and detecting the concentrations of multiple species by means of a spectrophone

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Embodiment Construction

[0024] Referring first to FIG. 1 of the drawings, a spectrophone assembly includes a cell or chamber 3 which in use is illuminated by two lasers 1, 2 with different wavelengths λ1, λ2 respectively. The chamber 3 is formed by two cylindrical tubes with internal length and diameter L1, D1and L2, D2 respectively, the two tubes being internally connected and vacuum closed to the outside.

[0025] The lasers 1, 2 are power modulated at frequencies ω1 and ω2 by modulators 1a and 2a respectively and, as references, these frequencies are sent to separate phase-lock amplifiers 10, 11. The laser beams are guided into the chamber 3 by fiber optics or wave guides 4 and the two beams are combined by a dichroic mirror 5 which transmits the beam from laser 1 and reflects the beam from laser 2.

[0026] The chamber 3 is closed by two radiation transmitting windows 6 through which the laser beams pass before being received by a radiation power meter 7 adjacent the exit window 6. A single power meter 7 i...

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Abstract

A method of identifying and determining the concentrations of multiple species in a gas sample, includes providing a spectrophone assembly having a detector chamber, supplying the gas sample to the detector chamber and simultaneously passing a plurality of radiations of different wavelengths into the detector chamber to produce multiple acoustic resonances of different frequencies. Acoustic resonances in the detector chamber are simultaneously sensed to produce corresponding electrical signals, and the electrical signals are analysed to identify the species present in the gas sample and determine the concentration of each specie.

Description

FIELD OF INVENTION [0001] This invention relates to the identification and determination of the concentrations of multiple species in a gas sample by means of a spectrophone. BACKGROUND OF INVENTION [0002] In laser based photo acoustic spectroscopy, each molecular specie in a detection chamber is basically detected from the response to illumination by laser radiation of a specific wavelength. Absorption of such radiation by a specie in the detector chamber at the specific wavelength produces an amplitude modulated pressure which is detected by a microphone in the detector chamber. Generally, if more than one specie is involved, with interference from unwanted species is to be taken into account, then operation at corresponding different wavelengths is required. The procedure involved ultimately sorts out different species and / or interfering components. [0003] Such a procedure normally requires the operation of a spectrophone at different wavelengths in time sequence, that is to say ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01J3/02G01N21/00G01N29/02G01N29/036G01N29/22G01N29/34G01N29/42
CPCG01N29/036G01N29/222G01N2291/0215G01N29/42G01N29/348
Inventor CRANE, ROBERT ANTHONY
Owner CRANE ROBERT ANTHONY
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