Optical scanning systems
Thermal imaging systems
Moving image scanner
Infrared viewing system
Scan conversion circuit
Combined staring and scanning photodetector sensing system having both temporal and spatial filtering
Pulsed radiation detection system Patent #: 4757200
ApplicationNo. 215507 filed on 07/06/1988
US Classes:250/342, Locating infrared emissive objects250/203.1, Following a target (e.g., a star or instrument pointer or other object) other than a pattern250/206.1, Having means to generate positional information in at least one plane of a target moving relative to one or more photodetectors250/334, Including means for scanning field of view348/164Infrared
ExaminersPrimary: Buczinski, Stephen C.
Attorney, Agent or Firm
Foreign Patent References
International ClassesG01J 001/20
Foreign Application Priority Data1987-07-08 GB
AbstractAn infra-red imaging system is operable selectively in wide and narrow field of view modes. Radiation from the object is imaged onto an infra-red CCD staring focal plane array (SFPA) which provides an output representing the image. In the narrow field of view mode, operative on detection of a particular target by target detection electronics, the image is not scanned but is made to follow any movement of the target, and the SFPA stares at the target to build up an image. In the wide field of view mode, the same SFPA is used to provide the image, but the image is scanned along a swath. Smearing of the image is minimized by driving the IRCCD array such that the image-bearing charge is passed down the array from element to element at a speed equal to the scanning speed, so that the output signal from the end element represents the intensity of radiation from a given portion of the object time-integrated by all the elements of the array in succession.