Wavelength modulation spectroscopy for simultaneous measurement of two or more gas ingredients

A wavelength modulation spectrum, wavelength modulation technology, applied in measurement devices, color/spectral characteristic measurement, and optical devices, etc., can solve problems such as failure to meet the requirements of sensitivity and fast response

Inactive Publication Date: 2009-12-30
詹姆斯·於
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previous attempts based on diode lasers have failed to meet the sensitivity and fast response requirements of many clinical applications

Method used

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  • Wavelength modulation spectroscopy for simultaneous measurement of two or more gas ingredients
  • Wavelength modulation spectroscopy for simultaneous measurement of two or more gas ingredients
  • Wavelength modulation spectroscopy for simultaneous measurement of two or more gas ingredients

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Embodiment Construction

[0028] In the following discussion about four preferred embodiments of the present invention, corresponding to figure 1 with figure 2 The first two preferred embodiments of use homodyne demodulation to demodulate the detector signal, while as image 3 with Figure 4 The third and fourth preferred embodiments shown employ heterodyne demodulation. The following preferred embodiment description describes a method for measuring absorption vectors from microphone or photodetector signals. The measured absorption vectors can be used to calculate the concentrations or concentration ratios of target gas components according to the method described in the foregoing "Summary of the Invention".

[0029] in such as figure 1 In the first preferred embodiment shown in the block diagram, the laser controller utilizes the waveform of frequency f generated by the modulation waveform device to generate a modulated current to drive the laser 30, and the laser 30 produces a beam of wavelengt...

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Abstract

Methods and systems to measure simultaneously concentrations or concentration ratio(s) of two or more gas ingredients in a sample area comprising: a wavelength modulated light source; an acoustic detector or a photodetector; and means to analyze the signal from the acoustic detector or the photodetector and calculate the concentrations or concentration ratio(s). The light from the light source is transmitted through the sample area. Part of the light will be absorbed in the sample area by the gas ingredients and generates photoacoustic signal. The acoustic detector is used to sample the photoacoustic signal. Alternatively, a photodetector is used to sample the light intensity after the light is transmitted through the sample area.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Serial No. 60863367, entitled "Wavelength Modulation for Simultanious Measurement of Two or More Gas Ingredients," filed October 28, 2006, which application is hereby incorporated by reference. technical field [0003] The present invention relates to wavelength modulation spectroscopy, and more particularly to the simultaneous measurement of the concentrations of two or more gas components using wavelength modulation spectroscopy. Background technique [0004] In many applications such as breath testing, it is necessary to measure the concentration of two or more gas components in a sample area. In the article "Near-infrared diode laser spectroscopy in chemical process and environmental air monitoring" published by P.A.Martin in Chem.Soc.Rev., Volume 31, 2002, pages 201-210, Martin summarized some methods for detecting and monitoring gas species technology,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/02G01N21/00
CPCG01N21/274G01N2021/399G01N2021/1704G01N21/39G01N2201/0691G01N21/1702G01N2021/391
Inventor 詹姆斯·於
Owner 詹姆斯·於
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