Infrared sensor with multiple sources for gas measurement
First Claim
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1. A closed path infrared sensor for detection of a gas analyte, comprising:
- an enclosure,a first energy source within the enclosure which emits energy at a first wavelength absorbed by the analyte,at least a second energy source within the enclosure which emits energy at a second wavelength absorbed by the analyte,at least one detector system within the enclosure, anda mirror system external to the enclosure and spaced from the enclosure, the mirror system reflecting energy from the first energy source to the at least one detector system via a first analytical path to output a first analytical signal indicative of gas concentration in an environment external to the enclosure and reflecting energy from the second energy source to the at least one detector system via a second analytical path to output a second analytical signal indicative of gas concentration in the environment external to the enclosure, each of the first analytical path and the second analytical path being less than two feet in length.
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Abstract
A closed path infrared sensor includes an enclosure, a first energy source within the enclosure, at least a second energy source within the enclosure, at least one detector system within the enclosure and a mirror system external to the enclosure and spaced from the enclosure. The mirror system reflects energy from the first energy source to the at least one detector system via a first analytical path and reflects energy from the second energy source to the at least one detector system via a second analytical path. Each of the first analytical path and the second analytical path are less than two feet in length.
61 Citations
20 Claims
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1. A closed path infrared sensor for detection of a gas analyte, comprising:
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an enclosure, a first energy source within the enclosure which emits energy at a first wavelength absorbed by the analyte, at least a second energy source within the enclosure which emits energy at a second wavelength absorbed by the analyte, at least one detector system within the enclosure, and a mirror system external to the enclosure and spaced from the enclosure, the mirror system reflecting energy from the first energy source to the at least one detector system via a first analytical path to output a first analytical signal indicative of gas concentration in an environment external to the enclosure and reflecting energy from the second energy source to the at least one detector system via a second analytical path to output a second analytical signal indicative of gas concentration in the environment external to the enclosure, each of the first analytical path and the second analytical path being less than two feet in length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of detecting a gas analyte, comprising:
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exciting a first energy source positioned within an enclosure such that energy from the first energy source, which has a first wavelength absorbed by the gas analyte, impinges upon a mirror system positioned external to the enclosure and spaced from the enclosure, the mirror system reflecting energy from the first energy source to at least one detector system positioned within the enclosure via a first analytical path to output a first analytical signal indicative of concentration of the gas in an environment external to the enclosure, exciting at least a second energy source positioned within an enclosure such that energy from the second energy source, which has a second wavelength absorbed by the gas analyte, impinges upon the mirror system, the mirror system reflecting energy from the second energy source to the at least one detector system via a second analytical path, which is different from the first analytical path, to output a second analytical signal indicative of the concentration of the gas analyte in the environment external to the enclosure, each of the first analytical path and the second analytical path being less than two feet in length; and determining the concentration of the gas analyte in the environment external to the enclosure based upon the first analytical signal output from the detector system corresponding to the first analytical path and the second analytical signal output from the detector system corresponding to the second analytical path.
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Specification