发明名称 |
Optical path switching based differential absorption radiometry for substance detection |
摘要 |
A system and method are provided for detecting one or more substances. An optical path switch divides sample path radiation into a time series of alternating first polarized components and second polarized components. The first polarized components are transmitted along a first optical path and the second polarized components along a second optical path. A first gasless optical filter train filters the first polarized components to isolate at least a first wavelength band thereby generating first filtered radiation. A second gasless optical filter train filters the second polarized components to isolate at least a second wavelength band thereby generating second filtered radiation. The first wavelength band and second wavelength band are unique. Further, spectral absorption of a substance of interest is different at the first wavelength band as compared to the second wavelength band. A beam combiner combines the first and second filtered radiation to form a combined beam of radiation. A detector is disposed to monitor magnitude of at least a portion of the combined beam alternately at the first wavelength band and the second wavelength band as an indication of the concentration of the substance in the sample path.
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申请公布号 |
US6057923(A) |
申请公布日期 |
2000.05.02 |
申请号 |
US19990290954 |
申请日期 |
1999.04.13 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION |
发明人 |
SACHSE, GLEN W. |
分类号 |
G01J3/08;G01J3/42;G01J3/447;G01N21/21;G01N21/31;G01N21/35;G02B5/30;(IPC1-7):G01N21/21 |
主分类号 |
G01J3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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