WINDOW OBSCURATION SENSORS FOR MOBILE GAS AND CHEMICAL IMAGING CAMERAS
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Abstract
An infrared (IR) imaging system for determining a concentration of a target species in an object is disclosed. The imaging system can include an optical system including a focal plane array (FPA) unit behind an optical window. The optical system can have components defining at least two optical channels thereof, said at least two optical channels being spatially and spectrally different from one another. Each of the at least two optical channels can be positioned to transfer IR radiation incident on the optical system towards the optical FPA. The system can include a processing unit containing a processor that can be configured to acquire multispectral optical data representing said target species from the IR radiation received at the optical FPA. One or more of the optical channels may be used in detecting objects on or near the optical window, to avoid false detections of said target species.
20 Citations
31 Claims
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1-11. -11. (canceled)
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12. A method of detecting obscuration of an optical window in an IR imaging system, the IR imaging system comprising processing circuitry and a plurality of spatially and spectrally distinct optical channels, each optical channel including a set of lenses that focus incident IR light on a respective portion of an optical detector system, the method comprising:
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with the processing circuitry, receiving a first image from a first optical channel in the plurality of optical channels; with the processing circuitry, receiving a second image from a second optical channel in the plurality of optical channels; and with the processing circuitry, analyzing the first and second images to detect obscuration that may degrade operation of the system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An example of an infrared (IR) imaging system comprising:
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a housing; an optical window disposed on the housing; an optical detector system disposed within the housing; and a plurality of spatially and spectrally distinct optical channels that transfer incident IR radiation from the optical window to the optical detector system, wherein said IR imaging system is configured to detect whether the optical window is obscured. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification