Tri-propellant total internal reflection prism for infrared target simulators
An infrared target and total reflection technology, applied in the field of TIR) prisms, can solve the problems of beam modulation, lower system energy utilization rate, large structure size, etc., and achieve the effect of improving contrast, improving energy utilization rate, and compact structure
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[0043] The three-component infrared TIR prism used in the optical engine of a DMD-based infrared target simulator of the present invention fully utilizes the characteristics that total reflection will occur when light is incident from an optically dense medium to an optically sparse medium, and by accurately calculating the prism oblique The side tilt angle realizes the modulation of the DMD "on" and "off" states. By selecting different infrared materials, it can be used in the optical engine of the infrared target simulator whose working band is the mid-wave infrared band of 3-5 μm and the working band of the long-wave infrared band of 8-12 μm.
[0044] Its optical path modulation process can be summarized as:
[0045] Such as figure 2 , the illumination beam is incident on the prism 20, totally reflected at 23, and incident on the DMD. When the DMD is in the "on" state, the reflected light is received by the projection system after passing through the prisms 21 and 22; whe...
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