Patent ID: 11960064
Assignee: BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. An airborne Mid-Wave Infrared (MWIR) Wide Area Motion Imagery (WAMI) remote sensor comprising, in order, from an object to an image plane:
a fast scanning mirror providing scanning about two axes to scan the object;
a first optical group having a positive optical power;
a first fold mirror;
a second fold mirror;
a second optical group having a positive optical power;
a Dewar window;
an aperture stop;
a cold filter; and
a Focal Plane Array;
wherein the first optical group is configured to receive MWIR radiation from the object and to direct a converged light onto the second optical group;
the first optical group comprising three optical elements having, in order from the object to the image plane, positive, negative and positive optical powers correspondingly;
the first fold mirror located between the first optical group and the second fold mirror;
the second fold mirror located between the first fold mirror and the second optical group, wherein the first and second fold mirror are configured to bend an optical axis of the converged light;
the second optical group is configured to re-image the converged light from the first optical group, and to focus the re-imaged light through the Dewar window, the aperture stop, and the cold filter onto the focal plane array in corresponding order;
the second optical group consists of four optical elements having, in order from the object to the image plane, positive, positive, negative and positive optical powers correspondingly;
wherein the optical elements of first and second optical groups consist of two optical materials; and
wherein the sensor operates in a spectral waveband of 3.31 μm-5.1 μm and forms an MWIR image on the focal plane array.