Wide field of view, four-telescope, radial scanning search and acquisition sensor
View Patent ↗A wide field of view imaging system ( 100 ). The novel system ( 100 ) includes a rotating mirror ( 18 ) having two reflective surfaces each surface, respectively, reflecting light from a scene to first and second sensors ( 10, 12 ) positioned to receive light from the mirror ( 18 ), wherein the first and second sensors ( 10, 12 ) each occupy a different portion of the volume surrounding the mirror ( 18 ). In the illustrative embodiment, the mirror ( 18 ) is a flat, double-sided mirror rotating at a constant velocity about an axis parallel with the surface of the mirror ( 18 ). The first and second sensors ( 10, 12 ) are all-reflective optical systems, with the first sensor ( 10 ) opposite the second sensor ( 12 ). In the preferred embodiment, the invention further includes third and fourth opposing sensors ( 14, 16 ) clocked 90° from the first and second sensors ( 10, 12 ). The first and second sensors ( 10, 12 ) cover an outer annulus of the field of view while the mirror ( 18 ) rotates a first 90°, and the third and fourth sensors ( 14, 16 ) cover an inner annulus while the mirror ( 18 ) rotates the next 90°.
1. A wide field of view imaging system comprising:
a rotating mirror for reflecting light from a scene and
first, second, third and fourth sensors positioned to receive light from said mirror, wherein said sensors each occupy a different portion of the volume surrounding said mirror, said first sensor being located opposite said second sensor and said third sensor being located opposite said fourth sensor, said first and second sensors being clocked 90° from said first and second sensors and wherein said first and second sensors cover an outer annulus of the field of view and the third and fourth sensors cover an inner annulus.
2. The invention of claim 1 wherein said mirror is double-sided.
3. The invention of claim 1 wherein said mirror is flat.
4. The invention of claim 1 wherein said mirror is rotating about an axis parallel with the surface of the mirror.
5. The invention of claim 1 wherein said mirror is rotating at a constant velocity.
6. The invention of claim 1 wherein said sensors are all-reflective.
7. The invention of claim 1 wherein said each sensor occupies a quadrant of the volume surrounding said mirror.
8. The invention of claim 1 wherein said first and second sensors scan while the mirror rotates a first 90° and said third and fourth sensors scan while the mirror rotates the next 90°.
9. A wide field of view imaging system comprising
a rotating double-sided mirror for reflecting light from a scene,
first and second sensors positioned to receive light from an outer annulus of the field of view from said mirror while the mirror rotates a first 90°; and
third and fourth sensors positioned to receive light from an inner annulus of the field of view from said mirror while the mirror rotates the next 90°, wherein said first, second, third, and fourth sensors each occupy a quadrant of a volume surrounding said mirror.
10. A method for imaging a wide field of view including the steps of:
reflecting light from a scene using a rotating mirror; and
receiving said light using two opposing sensors, each sensor occupying a different portion of the volume surrounding said mirror, each of said sensors covering an annulus of the field of view.
11. A wide field of view imaging-system comprising:
a double-sided mirror for reflecting light from a scene;
means for rotating said mirror; and
first and second sensors positioned to receive light from an outer annulus of the field of view from said mirror while the mirror rotates a first 90°.
12. A wide field of view imaging system comprising:
a mirror for reflecting light from a scene;
means for rotating said mirror; and
first, second, third and fourth sensors positioned to receive light from said mirror, wherein said sensors each occupy a different portion of the volume surrounding said mirror, said first and second sensors covering an outer annulus of the field of view and the third and fourth sensors covering an inner annulus.
13. A wide field of view imaging method including the steps of:
rotating double-sided mirror to reflect light from a scene and
positioning first and second sensors to receive light from an outer annulus of the field of view from said mirror while the mirror rotates a first 90°.
14. A wide field of view imaging method including the steps of:
rotating a mirror to reflect light from a scene and
positioning first, second, third and fourth sensors to receive light from said mirror, wherein said sensors each occupy a different portion of the volume surrounding said mirror, said first and second sensors covering an outer annulus of the field of view and the third and fourth sensors covering an inner annulus.