Abstract: A line scanning apparatus includes a cylindrical housing which holds a spin mirror, a detector array, a multiplexer assembly, an analog-to-digital converter, a shaft encoder, digital processing apparatus and memory storage devices. Inertial navigation system (INS) reference information, including velocity-to-height ratio data is provided. The line scanning apparatus further includes optics for focusing radiation which is reflected into the optics by the spin mirror which is inclined at about a 45.degree. angle to the optical axis. The detector array comprises a plurality of radiation detector cells which provide a plurality of synchronously sampled signals representative of the amount of radiation impinging on the detector array at any given time. The spin mirror is attached to a spin mirror motor which is further attached to the shaft encoder.

Abstract: Apparatus for scanning a remote object with a radiation detector and which prevents narcissus, ghost and stray radiation effects by providing radiation blocking means positioned to intercept all but the desired paths between a remote object and the detector.

Abstract: A detector array for use in an infrared linescanner system. The system scans an area of ground below an aircraft. The detector array comprises a linear array arranged in a symmetrical pattern about a centerline and has an angular overall length sufficient to provide contiguous coverage of the scanning area for a maximum specified velocity-to-height ratio.

Abstract: Either of two scenes of interest may be detected by use of a scanning sensor having a rotatable polygonal scanning mirror coupled to receive incident radiation from such scenes of interest. Apparatus is included for directing such incident radiation onto a detection device. A movable shutter is coupled to block receipt by the mirror of radiation from the first scene of interest when the second scene of interest is viewed, and vice versa.