[특허]Gas analyzing apparatus and method for simultaneous measurement of carbon dioxide and water

[미국특허] Gas analyzing apparatus and method for simultaneous measurement of carbon dioxide and water 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/35 G01N-021/05
출원번호	US-0670342 (1991-03-15)
발명자 / 주소	Eckles Robert D. (Malcom NE) McDermitt Dayle K. (Lincoln NE) Welles Jonathan M. (Lincoln NE)
출원인 / 주소	Li-Cor, Inc. (Lincoln NE 02)
인용정보	피인용 횟수 : 64 인용 특허 : 0

초록 ▼

To measure water vapor and carbon dioxide, a gas analyzer includes a light source, a reference flow cell, a sample flow cell, and a detector. The light source, flow cells and detector are arranged so that the detector detects light transmitted from said light source through said reference flow cell and through said sample flow cell and generates a reference signal representing the light transmitted through a reference gas in said reference flow cell and a sample signal representing the light transmitted through a sample gas in said sample flow cell. The reference signal is subtracted from the sample signal to obtain an independant variable. A signal representing gross concentration of the carbon dioxide as a dependant variable is obtained from said independent variable from a stored empirically determined third power polynomial. The polynomial includes terms having at least first, second and third powers of said independant variable. Each of these terms includes a coefficient determined empirically so that values of the dependant variable, gross concentration, can be determined for different independant variables.

대표청구항 ▼

Apparatus, comprising: a source of light having a spectrum of wavelengths including longer wavelengths and shorter wavelengths; means for transmitting light from said source of light through a gas sample cell containing a mixture of two gases, one of which has a high absorbance at said longer wavelength and the other of which has a high absorbance at said shorter wavelength; a dichroic beam splitter with a high transmission for one of said longer and shorter wavelengths and a high reflectance of the other of said longer and shorter wavelengths; a first detector positioned to receive light transmitted through said beam splitter; a second detector positioned to receive light reflected from said beam splitter, whereby one of said detectors receives principally light within the high absorbance frequency of one of said gases and other receives light within the high absorbance frequency of the other of said gases; a first narrow band pass filter between said beam splitter and said first detector for passing only light of said one wavelength and a second narrow band pass filter between said beam splitter and said second detector for passing only light of said other wavelength; said light source being an infrared light source, said first and second filters being 50 nanometer band pass filters, said first and second detectors being linear, said first filter having a center point at 4.26 microns and said second filter having a center point at 2.59 microns; a reference cell substantially free of said two gases; said means for transmitting light including means for transmitting light through said reference cell to said dichroic beam splitter, whereby a reference signal and a sample signal are generated by each of said first and second detectors; and means for receiving said reference and sample signals; said means for receiving said reference and sample signals including means for maintaining each respective reference signal constant by adjusting a corresponding scaling factor and means for multiplying each sample signal by their corresponding reference signal\s scaling factor.

이 특허를 인용한 특허 (64) 인용/피인용 타임라인 분석

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[미국특허] Gas analyzing apparatus and method for simultaneous measurement of carbon dioxide and water 원문보기

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[미국특허] Gas analyzing apparatus and method for simultaneous measurement of carbon dioxide and water 원문보기

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