Title: Sensor system
Application Number: 98811598 Application Date: 1998.09.23
Publication Number: 1280739 Publication Date: 2001.01.17
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04N5/217
Applicant(s) Name: The Secretary of State for Defence Address:
Inventor(s) Name: G.F. Marshall;R.A. Ballingall;S. Collins
Attorney & Agent: wang yue
Abstract:
    The invention provides a sensor system (800) for generating a sensor signal (Sout) corresponding to a filtered image of a scene. The system (800) incorporates a multielement array (526) and associated processing circuits for providing element signals in response to images projected onto it and a projecting lens assembly (502) for projecting images onto the array (526). The lens assembly (502) projects differently blurred images of the scene onto the array (526) for generating a measurement signal during a measurement phase and a local spatial average correction signal during a calibration phase. A light-diffusing shutter (522) is used for generating the differently blurred images. The system (800) substracts the measurement and correction signals of each element from one another to provide a difference signal and uses this signal to generate the sensor signal (Sout) during the measurement phase. The calibration phase is repeated on change of array temperature or incident radiation intensity, thereby reducing fixed pattern noise in the sensor signal (Sout) despite environmental change, and interrupting the measurement phase only infrequently.
Time: 8
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