A few years ago, a microlithographic deposition process on infrared-transmitting substrates was developed in order to produce realistic infrared scenes for FLIR testing'. In recent months, the performance of this product, named Thermoscene, has been improved by improving the control over the production process. The two main results are:1. An increase of the number of simulated grey levels from 15 to 290, without reduction of the total number of pixels. 2. A decrease in imperfections, such as unwanted holes in the mesh deposition, to almost zero.The Thermoscene is useful as a component of infrared simulators2, to project realistic infrared scenes through collimating optics to a FLIR, missile seeker, etc., for testing purposes.
The Minimum Resolvable Temperature Difference (MRTD) is a classic performance parameter, used by manufacturers of thermal imaging systems (FLIR's) in the characterization and final testing of such devices. The Johnson criterion [1] relates the MRTD to practical characteristics, such as the ability of the FLIR to resolve objects,as function of distance. However, the MRTD measurement suffers from several drawbacks,e.g. i) it is subjective, ii) it fails to account for complex real life situations, such as background and foreground clutter, object shape and nonuniformities of temperature and emissivity. This paper describes a new type of transparency which has been developed to simulate real infrared scenes. The transparency consists of a half -tone mesh of variable size holes which, when placed in front of a blackbody, simulates a two dimensional radiant emittance pattern. The pattern itself can be generated from a thermal image of any real object as seen by a high performance FLIR, from an artificially computer generated image, or from a combination of the two.Examples of thermoscenes and measurements of radiation distribution over a simple pattern are shown.Potential applications of the thermoscenes are also discussed.
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