Aperture arrangement
AssigneeSelex Sensors and Airborne Systems Limited
InventorStuart Duncan
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Abstract
An aperture arrangement is disclosed, such as an aperture arrangement suitable for use with a dual wavelength infrared detector. A detector is disclosed which includes a casing; an aperture defined in one end of the casing; and a filter having an inner region and an outer region substantially (e.g., greater than 50%) covering the aperture; wherein the outer region of the filter transmits radiation within a first range of wavelengths and reflects radiation within a second range of wavelengths.
Claims9
A detector comprising:
- a casing;
- an aperture defined in one end of the casing;
- and
- a filter having an inner region and an outer region substantially covering the aperture;
- wherein the outer region of the filter transmits radiation within a first range of wavelengths and reflects radiation within a second range of wavelengths.
A filter having wavelength selective zones determining cold stop apertures.
A filter according to claim 6, wherein the central zone is a physical aperture.
Dependencies are inferred from the claim text.