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Reflective chopper for infrared imaging systems

  • US 5,051,591 A
  • Filed: 01/10/1991
  • Issued: 09/24/1991
  • Est. Priority Date: 07/28/1989
  • Status: Expired due to Fees
First Claim
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1. A method for producing an image of a scene, using an infrared imaging system, comprising the steps of:

  • detecting the actual infrared radiation from said scene to form a biased signal representing the radiances of objects within said scene;

    scattering the infrared radiation emitted by said scene by placing an array of tubes having reflective inner surfaces across said actual radiation, such that rays of said radiation pass through said tubes at angles that are deviated from their normal path by said reflective inner surfaces;

    detecting said scattered radiation to form a reference signal;

    subtracting said reference signal from said biased signal to obtain an unbiased signal representing radiance differences emitted by said scene; and

    displaying an image generated in response to said unbiased signal.

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