High speed high resolution hyperspectral sensor
First Claim
1. A wide field-of-view hyperspectral filter to filter an image within a field of view, comprising a first optical path and a second optical path, wherein a first derivative of the difference between the first optical path and the second optical path as a function of the incidence angle approaches zero at least once within the field of view and a second derivative of the difference between the first optical path and the second optical path as a function of the incidence angle approaches zero at least once within the field of view.
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Abstract
A high speed high resolution spectral sensor is formed by placing a cascade of chained wide field-of-view Mach-Zender interferometers inside a dispersive sensor between the sensor'"'"'s grating and the focusing lens. Also is disclosed an optical filter with wide field-of-view capabilities. Such a filter is formed by inserting a plurality of gap plates of certain thicknesses and refractive indices. The invention provides formulas for calculation of optimal dimensions for such gap plates.
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19 Claims
- 1. A wide field-of-view hyperspectral filter to filter an image within a field of view, comprising a first optical path and a second optical path, wherein a first derivative of the difference between the first optical path and the second optical path as a function of the incidence angle approaches zero at least once within the field of view and a second derivative of the difference between the first optical path and the second optical path as a function of the incidence angle approaches zero at least once within the field of view.
- 9. A wide field-of-view hyperspectral filter comprising a plurality of interferometers chained in successive stages such that each exiting beam of each of said interferometers enters an interferometer of the succeeding stage, wherein the optical path difference inside interferometers of each of said stages is half that inside an interferometer of the preceding stage.
- 12. A hyperspectral sensor comprising a dispersive sensor, which comprises a grating, a focusing lens, and a focal plane array, and a hyperspectral filter positioned between said grating and said focusing lens whose spectral resolution is finer than the dispersive sensor by itself.
Specification