Infrared gas detector
First Claim
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1. A gas detector comprising:
- at least one source of infrared radiation;
at least two analytical detectors, each analytical detector adapted to provide an output signal indicative of a first gas of interest, said analytical detectors being positioned to receive radiation from said source of radiation, a first of said at least two analytical detectors being positioned to receive radiation of a first predetermined wavelength, and a second of said at least two analytical detectors being positioned to receive radiation of said first predetermined wavelength;
at least one reference detector adapted to provide an output signal independent of the first gas of interest;
a means for summing said output signals detected by said at least two analytical detectors; and
a sample chamber for receiving a gaseous sample,an optical path from said source of infrared radiation to said analytical detectors passing through said sample chamber.
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Abstract
A gas detector that includes at least one source of infrared radiation, at least two analytical detectors, each analytical detector adapted to provide an output signal indicative of a first gas of interest and positioned to receive radiation from the source of radiation, at least one reference detector adapted to receive radiation of a predetermined wavelength, a sample chamber for receiving a gaseous sample, and an optical path length disposed between the source of radiation and the analytical detectors and passing through the sample chamber.
58 Citations
43 Claims
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1. A gas detector comprising:
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at least one source of infrared radiation; at least two analytical detectors, each analytical detector adapted to provide an output signal indicative of a first gas of interest, said analytical detectors being positioned to receive radiation from said source of radiation, a first of said at least two analytical detectors being positioned to receive radiation of a first predetermined wavelength, and a second of said at least two analytical detectors being positioned to receive radiation of said first predetermined wavelength; at least one reference detector adapted to provide an output signal independent of the first gas of interest; a means for summing said output signals detected by said at least two analytical detectors; and a sample chamber for receiving a gaseous sample, an optical path from said source of infrared radiation to said analytical detectors passing through said sample chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 26)
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21. A gas detector for detecting a predetermined gas, the gas detector comprising:
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a source of infrared radiation; a plurality of infrared radiation detectors, at least two of said infrared radiation detectors being, adapted to detect radiation of a first wavelength and being adapted to provide an output signal corresponding to the presence of the gas of interest; and a means for summing said output signals generated by said analytical detectors. - View Dependent Claims (22, 23, 24, 25, 27, 28, 29, 31, 32, 33)
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30. The gas detector of clam 29, wherein a filter is interposed between the at least one source of infrared radiation and each additional analytical detector, the filter being adapted to transmit radiation of a second band of wavelengths said second band of wavelengths corresponding to radiation of a wavelength absorbed by the second gas of interest.
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34. A method of detecting gas using a gas detector comprising
a source of infrared radiation, at least two analytical detectors, each of said at least two analytical detectors being adapted to generate a signal indicative of a first gas of interest, a sample chamber, and an optical path passing through said sample chamber, the method comprising: -
transmitting infrared radiation from said source of infrared radiation through a gaseous sample present in the sample chamber of said gas detector; detecting infrared radiation of a first predetermined wavelength at a first of said at least two analytical detectors; detecting infrared radiation of said first predetermined wavelength at a second of said at least two analytical detectors; sending a signal from said analytical detectors to a processor; and
summing the signals from said analytical detectors. - View Dependent Claims (35, 36, 37, 38, 39)
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40. A method of analyzing a gaseous sample, the method comprising:
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passing the gaseous sample through the sample chamber of a gas detector comprising at least one source of infrared radiation, at least two analytical detectors, each analytical detector being adapted to provide an output signal indicative of a first gas of interest, said analytical detectors being positioned to receive radiation from said source of radiation, and a sample chamber; radiating the gaseous sample with radiation from said source of infrared radiation; detecting said radiation of a first predetermined wavelength at a first of said at least two analytical detectors; detecting said radiation of said first predetermined wavelength at a second of said at least two analytical detectors; generating signals corresponding to said detected radiation; summing signals generated by said analytical detectors; and analyzing the summed signals generated by the detectors. - View Dependent Claims (41, 42, 43)
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Specification