Filter mosaic for detection of fugitive emissions
AssigneeExelis, Inc.
InventorJarett Levi Bartholomew
Life of this patent
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Abstract
A method and apparatus for quantitative and qualitative imaging of fugitive emissions of gas, vapors, or fumes are described. The apparatus includes a filter mosaic for placement in registration over an imaging focal plane array (FPA). The filter mosaic includes at least two filter elements providing transmission response functions for transmitting wavelengths of light corresponding to an absorption wavelength (online wavelength) and a non-absorption wavelength (offline wavelength) of the targeted fugitive emission. Also described is an image processing method for transforming a filtered image into an image of the targeted fugitive emission.
Claims9
A system for imaging a target comprising:
- an imaging array for imaging light from the target,
- a filter array, disposed in front of the imaging array, for filtering received light from the target and transmitting the received light to the imaging array,
- wherein the received light includes at least one online wavelength corresponding to a wavelength absorbed by the target, and
- at least one offline wavelength corresponding to a wavelength not absorbed by the target, and
- the filter array is configured to separate the at least one online wavelength from the at least one offline wavelength,
- wherein the filter array includes a silicon etalon with an anti-reflective coating deposited in a periodic pattern, and
- the periodic pattern corresponds to a wavelength spacing between methane absorption features forming the at least one online wavelength.
Dependencies are inferred from the claim text.