| 摘要 |
A system and method for simultaneous imaging of both infrared and millimeter wave radiation. The novel optical system ( 10 ) includes a primary mirror ( 20 ), a Mangin secondary mirror ( 30 ) positioned to receive energy reflected from the primary mirror ( 20 ), and an immersion lens ( 40 ) for focusing energy received from the Mangin mirror ( 30 ). In the illustrative embodiment, the primary mirror ( 20 ) and Mangin mirror ( 30 ) are arranged in a Cassegrain configuration. Central to this invention is the use of a negative power refractive Mangin mirror ( 30 ) as the Cassegrain secondary mirror, so that the field curvature of the secondary mirror ( 30 ) and immersion lens ( 40 ) can be made to cancel. The immersion lens ( 40 ) effectively decreases the wavelength of the millimeter wave radiation, allowing a smaller detector to collect the same amount of radiation as would a larger detector in air. In the illustrative embodiment, the system ( 10 ) further includes a detector array ( 52 ) placed in intimate contact with the immersion lens ( 40 ).
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