Optical gas analyzer
First Claim
1. An optical gas analyzer for analyzing an anesthetic gas, N2 O and CO2, each of said anesthetic gas, N2 O and CO2 having corresponding wavelength characteristics, contained in a gas sample comprising a source of radiation, means for defining a radiation path, gas sample means for providing said gas sample in said radiation path whereby said radiation passes through said gas sample, radiation divider means for dividing said radiation after passing through said gas sample into at least three secondary radiation paths, at least three optical filter means, said at least three optical filter means including first optical filter means corresponding to said anesthetic gas characterized by passing therethrough a wavelength of about 8.81μ
- , second optical filter means corresponding to said N2 O characterized by passing therethrough a wavelength which is characteristic for said N2 O, and third optical filter means corresponding to said CO2 characterized by passing therethrough only wavelengths of about 4.26μ
, and at least three detector means for measuring said wavelength characteristics of said gases to be analyzed, said radiation divider means comprising mirror means wherein said at least three optical filter means and said mirror means are arranged such that said radiation may be passed through said at least three optical filter means to said at least three detector means after a single reflection from said mirror means.
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Accused Products
Abstract
Optical gas analyzers are disclosed for analyzing gas samples, including a source of radiation, a gas sample cell through which the radiation passes, a mirror for dividing that radiation into a number of secondary radiation paths for each of the gases in the gas sample which is to be analyzed, with the mirror being arranged so that after a single reflection from the mirror each of the secondary radiation paths is directed to an optical filter which passes a preselected wavelength characteristic of the particular gas in question, and then to a detector for measuring that wavelength characteristic. These optical gas analyzers are preferably used in connection with gas samples which include anesthetic gases, along with CO2 and N2 O.
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Citations
28 Claims
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1. An optical gas analyzer for analyzing an anesthetic gas, N2 O and CO2, each of said anesthetic gas, N2 O and CO2 having corresponding wavelength characteristics, contained in a gas sample comprising a source of radiation, means for defining a radiation path, gas sample means for providing said gas sample in said radiation path whereby said radiation passes through said gas sample, radiation divider means for dividing said radiation after passing through said gas sample into at least three secondary radiation paths, at least three optical filter means, said at least three optical filter means including first optical filter means corresponding to said anesthetic gas characterized by passing therethrough a wavelength of about 8.81μ
- , second optical filter means corresponding to said N2 O characterized by passing therethrough a wavelength which is characteristic for said N2 O, and third optical filter means corresponding to said CO2 characterized by passing therethrough only wavelengths of about 4.26μ
, and at least three detector means for measuring said wavelength characteristics of said gases to be analyzed, said radiation divider means comprising mirror means wherein said at least three optical filter means and said mirror means are arranged such that said radiation may be passed through said at least three optical filter means to said at least three detector means after a single reflection from said mirror means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- , second optical filter means corresponding to said N2 O characterized by passing therethrough a wavelength which is characteristic for said N2 O, and third optical filter means corresponding to said CO2 characterized by passing therethrough only wavelengths of about 4.26μ
- 18. An optical gas analyzer for analyzing a predetermined number of gases contained in a gas sample comprising a source of infrared radiation for continuously emitting said infrared radiation over a predetermined wavelength range comprising a thermal lamp, lamp envelope means comprising quartz glass for absorbing said radiation from aid thermal lamp whereby upon heating said quartz glass emits said infrared radiation, said lamp envelope means including a metallic outer layer including an oxidized outer surface, means for defining an infrared radiation path, gas sample means for providing said gas sample in said infrared radiation path whereby said infrared radiation passes through said gas sample, infrared radiation dividing means for dividing said infrared radiation after passing through said gas sample into a plurality of secondary infrared radiation paths corresponding to said predetermined number of gasses, a plurality of optical filter means corresponding to said predetermined number of gases, each of said plurality of optical filter means characterized by passing therethrough a preselected wavelength characteristic of one of said predetermined number of said gases to be analyzed, and a plurality of detector means corresponding to said predetermined number of gases for measuring said preselected wavelength characteristic of one of said predetermined number of said gases to be analyzed, said radiation divider means comprising mirror means wherein said plurality of optical filter means and said mirror means are arranged such that said infrared radiation may be passed through said plurality of optical filter means to said plurality of detector means after a single reflection from said mirror means.
- 21. An optical gas analyzer for analyzing a predetermined number of gases contained in a gas sample comprising a source of radiation, means for defining a radiation path, gas cell means for providing said gas sample in said radiation path, whereby said radiation traverses said gas cell means directly from said source of radiation without prior reflection, radiation divider means for dividing said radiation after traversing said gas cell means into a plurality of secondary radiation paths corresponding to said predetermined number of gases, a plurality of optical filter means corresponding to said predetermined number of gases, each of said plurality of optical filter means characterized by passing therethrough a preselected wavelength characteristic of one of said predetermined number of gases to be analyzed, and a plurality of detector means corresponding to said predetermined number of gases for measuring said preselected wavelength characteristic of one of said predetermined number of said gases to be analyzed, said radiation divider means comprising mirror means wherein said source of radiation, said plurality of optical filter means and said mirror means are arranged such that said radiation may be passed from said source of radiation directly to said mirror means and through said plurality of optical filter means to said plurality of detector means with only a single reflection.
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25. An optical gas analyzer for analyzing a predetermined number of gases contained in a gas sample comprising a source of infrared radiation, means for defining a radiation path, gas sample means for providing said gas sample in said radiation path whereby said radiation passes through said gas sample directly from said source of radiation without prior reflection, radiation divider means for dividing said radiation after passing through said gas sample into a plurality of secondary radiation paths corresponding to said predetermined number of gasses, said radiation divider means being disposed with respect to said source of radiation and said gas sample means whereby said radiation passes to said radiation divider means directly from said radiation source and said gas sample means without prior reflection, a plurality of optical filter means corresponding to said predetermined number of gases, each of said plurality of optical filter means characterized by passing therethrough a preselected wavelength characteristic of one of said predetermined number of said gases to be analyzed, and a plurality of detector means corresponding to said predetermined number of gases for measuring said preselected wavelength characteristic of one of said predetermined number of said gases to be analyzed, said radiation divider means comprising mirror means wherein said plurality of optical filter means and said mirror means are arranged such that said infrared radiation may be passed through said plurality of optical filter means to said plurality of detector means after a single reflection from said mirror means.
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26. An optical gas analyzer for analyzing a predetermined number of gases including an anesthetic gas contained in a gas sample comprising a source of radiation, means for defining a radiation path, gas sample means for providing said gas sample in said radiation path whereby said radiation passes through said gas sample, radiation dividing means for dividing said radiation after passing through said gas sample into a plurality of secondary radiation paths corresponding to said predetermined number of gases, a plurality of optical filter means corresponding to said predetermined number of gases, said plurality of optical filter means including first optical filter means corresponding to said anesthetic gas characterized by passing therethrough a wavelength only between about 3.8 and 5μ
- or between about 8 and 14μ
, whereby moisture present in said anesthetic gas does not substantially affect the measured gas analysis therefor, and a plurality of detector means corresponding to said predetermined number of gases for measuring preselected wavelength characteristics of said predetermined number of said gases to be analyzed, said radiation divider means comprising mirror means wherein said plurality of optical filter means and said mirror means are arranged such that said radiation may be passed through said plurality of optical filter means to said plurality of detector means after a single reflection from said mirror means. - View Dependent Claims (27, 28)
- or between about 8 and 14μ
Specification